Sierra
Mercury 35 - 70 HP Gearcase Assembly Exploded View
Mariner Gearcase Assembly Exploded View Diagram and Parts
Fits 35 & 40 HP 2-Cyl; 50, 60, 65 HP 3-Cyl; 10 HP 3-Cyl; 40,45,50 HP 4-Cyl
Figure #DescriptionO.E.M. #Sierra #Qty.
1Gear Housing1643-9539A1 1
2Dowel Pin17-85500 2
3Stud16-33778 3
3A.Stud16-57933 2
4Shift Cam76039 1
5Roller Bearing31-62091 1
5A.Roller Bearing31-21739 1
5B.Roller Bearing31-21700 1
6Support Plate92815 1
7Exhaust Tube Seal37721 18-0539 21
8Pinion Gear43-98097 1
9Nut11-13438 3
9A.Pinion Nut11-55910 1
9BNut11-34863 1
9CNut11-34933 18-23621
9DNut11-69578A 18-3702 31
10Gasket27-19552 18-2841 1 21
10A.Gasket27-19553 18-2833 1 21
10B.Gasket27-19551 18-2824 1 21
11O-Ring25-25439 18-7153 11
11AO-Ring2531986 18-7160 11
11BO-Ring25-26722 18-7115 1 21
12Water Pump Base46-77177A1 18-34241
13Seal26-90562 18-2011 1 21
13ASeal26-79831 18-2055 1 21
13BSeal26-816461 18-2054 11
13CSeals (2)26-69188/26-69189 18-2051/ 18-2052 11
14Cam Follower38441 1
15Slide20843 1
16Tapered Roller Bearing31-38356A1 18-11621
17Face Plate54705 18-3107 21
18Forward Gear43-55608A4 1
19Impeller47-89983 18-3007 21
20Key28-56662 1
21Water Pump Body46-77822A 18-3118 21
22Insert48753 18-3115 21
23Washer12-77674 18-2316 11
23A.Washer12-29245 18-42753
23B.Washer12-45175 1
23C.Washer12-65791 1
24Clutch52-92911 1
25Seal26-38452 1
26Nylon Washer12-38453 1 2 1
27Slinger25-202731 2 1
28Drain Plug10-79953 18-22442
29Cross Pin17-38113 1
30Flush Plug Washer19-48750 1
31Flush Plug Washer12-492211 18-2948 11
32Shift Shaft76163A1 1
33E-Clip53-29641 18-42951
34Prop Shaft44-75365 1
35Shift Shaft Bushing23-77631A2 18-2155 11
36Reverse Gear43-79158 1
37Thrust Washer12-32004 1
38Reverse Lock Base78036 1
39Reverse Lock Cam433081 1
40Drive Shaft45-981801 1
41Spring24-38114 1
41A.Spring24-39845 1
42Pin17-30545 1
43Sleeve88181 1
44Shim Set15-92881A1 AR
44A.Shim Set15-38374A1 AR
44BShim Set15-20927A1 AR
45Tapered Bearing31-77420A1 1
46Ball Bearing30-20839 1
47Bearing Carrier69386A1 1
48Key28-30281 1
49Tab Washer14-53012 1
50Cover Nut11-87763 1
51Trim Tab31640A1 18-60111
52Screw10-66024 1
53Thrust Hub73345A1 18-42331
54Thrust Hub14-76281 18-32041
55Washer12-19183 18-29451 22
1Indicates contents of seal kit 18-2654
2Indicates contents of water pump kit (Refer to application chart for correct kit)
3Prop Nut Kit (includes tab washer)
ARAs required
Average Customer Review for Insert Cup - 18-3115 - Sierra
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water pump cup
by David from Jay, Florida on July 07, 2012
Very timley on delivery, works like it is supossed to, thank U David
(1 of 1 people found this review helpful)
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Average Customer Review for Sierra 18-3424 Water Pump Base
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Excellent purchase...just as promised
by Alvin from Mechanicsville, Virginia on May 21, 2015
Excellent selection, excellent price, excellent delivery.....what's not to love???
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water pump base
by David from Jay, Florida on July 15, 2012
working very well
(0 of 1 people found this review helpful)
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great
by James from Fairfield, Iowa on June 11, 2012
great
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Average Customer Review for Shift Shaft Washer - 18-2316-9 - Sierra
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sam
by Harvey from Shreveport, Louisiana on October 22, 2013
cool
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Average Customer Review for Propeller Tab Washer - 18-3204-9 - Sierra
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Necessary maintenance item
by Barry from Cullman, Alabama on July 04, 2016
Good value for a necessary maintenance item - very satisfied.
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Holy wow
by Robert from Des Plaines, Illinois on July 26, 2015
Best tab washers I've ever bought! Also, the only tab washers I've ever bought!
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Undetermined
by Darel from Kaneohe, Hawaii on February 25, 2015
I bought this product thinking it would fit my Alpha 1 Generation 2 stern drive however I needed a larger size. I haven't taken it out of the package so I gave it a neutral rating of 3 just on the looks and feel.
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Propeller TAB Washer
by Kevin from Oakbrook Terrace, Illinois on July 16, 2014
Simple and EZ to order on line. Fast shipping and the tab washer is a perfect fit for my 1986 Mercury 45HP.
(0 of 1 people found this review helpful)
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Propeller tab washers
by Lester from Houston, Texas on June 11, 2014
They were just like the original and it was cheaper to buy the pack of 10 from Iboats than to buy two from the dealer. Now I have some spares for the other times I change out a prop.
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Good Device
by Martin from Streamwood, Illinois on August 19, 2011
Fit great and saved time
(1 of 1 people found this review helpful)
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Based On 7 Reviews | Write Review
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Perfect fit!
by Richard from Tampa, Florida on October 20, 2015
Package came on time and included two gaskets for multiple applications. Perfect fit!
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Fits
by Adam from Bowling Green, Kentucky on March 03, 2014
Fits, that all that's required. Does the job.
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always nice parts
by Jay from Victor, Montana on October 06, 2013
great fitting as usual. Thanks for the great service .Jay
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Good
by Zach from West Valley, Utah on September 07, 2012
This worked on my engine perfectly. I have a 1974 Mercruiser with a 302 Ford in it.
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Product was fine, severe shipping issues
by Mike from Lumberton, North Carolina on May 18, 2012
Product was fine. Logistics at iboats getting the product shipped in a timely manner needs work. It was not shipped for 24 hours after I ordered the product.
(1 of 1 people found this review helpful)
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exhaust gasket
by Ron from Bellflower, California on May 30, 2011
fixed our problem. thanks
(0 of 1 people found this review helpful)
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Review for Sierra 18-2833 Exhaust Elbow Gasket
by a Customer on October 06, 2008
perfect
(0 of 1 people found this review helpful)
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shift shaft replacement
by Jeffrey from Scottsburg, Virginia on August 07, 2013
Only took the boat out twice since replacing this bushing, but from inspection I haven't seen any lower unit oil leaking as before. Hope that was the problem.
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just like oem
by Stewart from Winnipeg, Manitoba on June 24, 2013
great parts
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water pump
by David from Jay, Florida on July 05, 2012
worked very well
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Great Product
by Kenneth from Cortez, Colorado on September 16, 2012
Great product works just like the OEM part. The service I got from the represinitive on the phone was very helpfull and anwsered all the questions I had with my order.
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water pump
by David from Jay, Florida on July 05, 2012
work very well. Thanks
(1 of 1 people found this review helpful)
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Average Customer Review for Sierra 18-2945-9 Drain Screw Gasket
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Good quality
by Norm from Massena, New York on September 15, 2015
exactly what I needed
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Good product.
by Dean from Honolulu, Hawaii on October 21, 2011
Satisfied with quality of the product.
(0 of 2 people found this review helpful)
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Review for Drain Screw Gasket for Johnson/Evinrude 307552, Volvo Penta, Mercruiser 12-1918
by a Customer on July 20, 2009
I wish the gentlemen that took my order would have told me that the plugs came with the gaskets? Oh well now I have have spares.
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Average Customer Review for Sierra 18-3702 Propeller Nut Kit
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Based On 11 Reviews | Write Review
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thanks for nothing
by Doug from Pittsford, Vermont on June 27, 2015
Gave the motor serial number and got the prop right, but the propeller nut and thrust washer did not match the spline pattern of the prop. Thanks, I'm without a boat on my vacation. And this site won't let me choose 0 stars .... you deserve negative. Go elsewhere fast!
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ur nuts
by Larry from Lady Lake, Florida on December 23, 2014
it's just a nut, but it works.
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Prop Nut Kit
by Jim from Branson, Missouri on November 26, 2014
Sorry, but I have not used it yet and do not plan to do so until spring time.
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oversized not right
by John from Melbourne, Arkansas on August 11, 2014
The nut was twice as tall as the stock one. the rubber engagement ring was still off the shaft when fully tightened. I had to reuse the original nut!!
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quality kit
by Thomas from Las Vegas, Nevada on March 08, 2014
This nut kit was the perfect match for propeller install. Nice to have as a spare, too.
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perfect fit
by Thomas from Las Vegas, Nevada on February 26, 2014
Perfect fit for my new prop. Could have used the old one, but having a new one, especially being a lock type nut is a good idea. And now I have a spare.
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Prop Nut Washer
by Brian from Luskville, Quebec on August 07, 2013
New Prop Hub warrants a New Washer Nut. A minor expense for peace of mind.
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????????????????????????????
by Richard from Shrievport, Louisiana on May 02, 2013
Satisfied!
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prepared
by Donald from Des Plaines, Illinois on July 18, 2012
I got this extra nut kit to have when I drop my other one in the lake by accident!
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????
by Kenneth from Heyworth, Illinois on August 20, 2011
GOOD PRODUCT....
(0 of 1 people found this review helpful)
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Good
by Steven from Boerne, Texas on June 20, 2011
Good
(0 of 2 people found this review helpful)
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Based On 4 Reviews | Write Review
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Good value
by Frank from Waterloo, Ontario on June 03, 2015
Speedy delivery to Canada, Parts I needed all included with kit. cost 25% of what local dealer 40 km away wanted, mailed right to me Yay! Should of used a bit bigger socket to install seals but other wise smooth install.
(1 of 1 people found this review helpful)
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Gaskets for lower unit
by Roger from Ashland, Kentucky on July 03, 2014
I just there was some directions on re-building the lower gear unit.
(1 of 1 people found this review helpful)
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Good Stuff
by Andrew from Nevada, Iowa on July 02, 2012
This kit contained everything I needed to re-seal my '74 Merc 650 lower unit. seals look decent and perform well. Good Stuff.
(1 of 1 people found this review helpful)
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seal kit
by James from Marathon, New York on April 29, 2012
great part quick ship
(1 of 2 people found this review helpful)
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Based On 10 Reviews | Write Review
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Great
by Brandon from Milton, Florida on July 30, 2016
It fit perfectly
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Very pleased
by Thomas from Lebanon, Tennessee on April 21, 2016
Very happy, great price, great product
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Works as expected
by Mark from Belleville, Michigan on August 13, 2015
Does what it is supposed to do.
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Fits Great
by Ken from Towanda, Kansas on November 17, 2014
Great Product, perfect fit, fast shipping
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Mercury Trim Tab
by David from Saint Francis, Minnesota on August 22, 2013
Looks like the original, great price, very fast shipping
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does not leave much room
by Donald from Cincinnati, Ohio on May 30, 2013
I put this on with what I believed to be the stock prop and it a 14 5/8 x 17p Solas on Alpha 1. It left about a 16'th inch clearance. So I replaced it with high performance anode and it took a shorter bolt.
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Trim Tab
by Rob from West Warwick, Rhode Island on October 25, 2012
Great Product Fits Well
(1 of 1 people found this review helpful)
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works as advertised
by Wladimir from Mocanaqua, Pennsylvania on July 07, 2012
very satisfied
(2 of 3 people found this review helpful)
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trim tab
by Steve from caldwell, Idaho on May 26, 2012
everything i have bought from you has been great thank you:)
(1 of 1 people found this review helpful)
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Great Company - Great Product
by Hayden from Grenada, Mississippi on March 23, 2012
Very please with this product...all parts were included....easy installation...purchased this product based on other reviews...Hats off to iboats.com...fast shipping...GREAT prices...will do business with them again.
(8 of 10 people found this review helpful)
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Average Customer Review for Sierra 18-4233 Propeller Thrust Washer
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screwed up
by Doug from Pittsford, Vermont on June 27, 2015
wrong item even though I gave you the serial of motor and you got the prop right. Go to another site, these guys can't get it right.
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good call
by Brenda from Weldon, Illinois on May 16, 2015
As a new boat owner I wasn't sure if I needed it. Suggestion payed off. Mine was so worn it was push all the way off.. runs like a champ now.
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Good information
by Mike from Hopkinsville, Kentucky on August 16, 2013
Very knowledgeable
(0 of 1 people found this review helpful)
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top of the line
by John from Orange, Texas on May 20, 2013
It fit my 1987 35 HP
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Works great
by Gary from Albia, Iowa on January 18, 2012
THE RIGHT PART FOR THE JOB.THANKS
(1 of 1 people found this review helpful)
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Average Customer Review for Sierra 18-3007 Water Pump Impellers
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Based On 14 Reviews | Write Review
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Good product
by Jason from Colfax, Illinois on August 27, 2016
Works great - easy installation.
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Perfect fit!
by Mykal from Sweet Home, Oregon on July 29, 2015
Excellent quality component. Exact match to what I pulled out of my old impeller. My boat runs wonderfully with that. Stream of water flowing out the back.
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Water Pump Impeller for Mercruiser 47-89983T, Mercury/Mariner, GLM 89830 89480 - Sierra
by Glenn from South Bend, Indiana on July 30, 2014
Great Service!
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Water Pump Impeller
by Kevin from Oakbrook Terrace, Illinois on July 16, 2014
Simple and EZ to order on line. Fast shipping and the impeller is a perfect fit.
(2 of 3 people found this review helpful)
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Outstanding
by Bryan from American Fork, Utah on December 05, 2013
The product was less money and the shipment and the service was great I would recommend them to anybody
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mercury replacement impeller
by Jeremy from Marceline, Missouri on May 26, 2013
Seems to be OEM quality or better. Exact fit and great cooling now! Super fast shipping as always!!!
(2 of 2 people found this review helpful)
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18-3007
by Larry from Sooke, British Columbia on April 01, 2013
Very Good Product
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Thanks
by John from Niagara Falls, New York on September 08, 2012
great service, fast delivery
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poor
by Jesse from Rimrock, Arizona on July 16, 2012
Gave you the part number I needed, You sent the complete wrong impeller.
(1 of 2 people found this review helpful)
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impeller
by David from Jay, Florida on July 05, 2012
worked very well.
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Everthing good
by Allen from Vacaville, California on May 28, 2012
Everthing good
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Water Pump Impeller
by Ronald from Saint Charles, Missouri on January 17, 2012
Looks just like the Merucry impeller that I replaced.
(2 of 2 people found this review helpful)
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Good Deal
by Ray from Scottsdale, Arizona on December 11, 2011
Great price. Will be using iboats for future purchases
(1 of 1 people found this review helpful)
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great product
by Joseph from Tallahassee, Florida on November 27, 2011
could use some instructions to insure proper assembly
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Based On 12 Reviews | Write Review
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nice
by Victor from Underwood, Iowa on June 15, 2015
nice, just what I needed
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Great OEM replacement
by Darryl from Decatur, Illinois on November 30, 2014
An excellent replacement to worn OEM parts. After years of routine service on my lower unit, the OEM drain plug became worn and hard to take off and put back on. This part assembly was a perfect fit for my Merc 225 EFI.
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New Drain Plug
by Stanley from Linden, Alabama on October 16, 2014
I always replace the drain plug when servicing the unit.
(1 of 1 people found this review helpful)
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vent plug
by Bob from Carthage, Missouri on August 08, 2014
Fits perfectly on my 99 Merc 150
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very good price and shipping
by Wayne from Montgomery, Illinois on April 05, 2014
shipping was very fast
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Missing seal
by Michael from Minnetrista, Minnesota on February 23, 2014
Either the picture for this product is misleading, or there was a piece missing from the order. The picture shows a plug with a gasket however, only the plug was sent (no gasket). Two emails to the customer service area regarding this went unanswered.
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drain plugs
by Willie from Moweaqua, Illinois on September 19, 2013
fast shipping , great product
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Great replacement
by Shawn from Peculiar, Missouri on August 02, 2013
These plugs are a great replacement for the factory plugs. I will always keep a pair in the toolbox.
(0 of 2 people found this review helpful)
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What's to say
by Scott from Chisholm, Minnesota on June 12, 2012
This does what it is supposed to do and that is stop the oil from coming out when in place and allow it to flow out when removed. Seems to work well!
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Cheaper than Ebay
by Caleb from Mauldin, South Carolina on March 24, 2012
I lost my plug when winterizing, and found this one for cheaper than even ebay, exactly what I needed
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Mercury Drain Plug
by Michael from Mars Hill, North Carolina on January 05, 2012
Exactly as described. Fit perfectly.
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Review for Sierra 18-2244 Drain Plug
by a Customer on September 04, 2009
(1 of 3 people found this review helpful)
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Q:
Will this fit a 79 mercury 50hp?
A:
Yes this will work for your engine.


Q:
Will this fit a 73 50 hp thunderbolt ?
A:
Yes this should work for your engine.


Q:
Will this fit my 1988 Mercury 115?
A:
Yes. Our sources indicate that this should work for your model.


Q:
Will that seal work on my 1989 500-50hp Canada built, sn7079786?
A:
The 500 model did not have a production year in 1989. In that year as well there were no models listed with that serial number. If you can double check info and give us a call we can assist you further.


Q:
Sierra oil seal 18-2052, will that work with my 50 HP Mercury 1980/1981?
A:
Looking at the serial number ranges for those years those would work, 5531630-9248006 is the serial ranges it fits within.


Q:
Does this come with the o-ring gasket?
A:
Yes, the plug and the gasket come together.


Q:
Does this fit a Merc 25XD serial # 6634579?
A:
No you need 18-2375 from Sierra for your motor.


Q:
Is the price for one lock washer?
A:
This is for a package of 10.


Q:
Does the [Propeller Nut Kit - 18-3702D - Sierra] work with the Solas propellers?
A:
Yes it will work with Solas propellers as long as the kit is called for your motor.


Q:
Is there a difference between the 18-7160 o-ring and the 18-7160-9 o-ring?
A:
No. They are the same.


Q:
Is this the gasket for the screw where the gear oil goes in the lower unit?
A:
That is right. It is designated for the drain area where the oil enters the lower unit.


Q:
I need an impeller for a 2004 50 hp EFI 4 stroke outboard. I can't find the matching part?
A:
We will need the engine gear ratio in order to match up the correct impeller. Let us know if you can provide that.


Q:
I have a 2009 50hp mercury outboard. I need an impeller but the serial number I have does not match any that I see for that HP. My serial number is 1B7727470?
A:
The replacement impeller that pulls up for your Mercury engine is this one: http://www.iboats.com/Water-Pump-Impeller-18-3056-Sierra/dm/view_id.172244


Q:
Will this fit a 2004 bayliner boat 3.0 with alpha one stern drive serial no 0w541718?
A:
No, you need 18-3056: http://www.iboats.com/Water-Pump-Impeller-18-3056-Sierra/dm/view_id.172244


Q:
Is this the right impeller for my 1990 Malibu with 350 FordMerc 5.7L?
A:
This is a aftermarket part. We need your engine serial number to look up a diagram of your engine to see if this part matches up to the OEM part number for your engine. Please email, chat or call in with your FULL engine information including engine manufacturer, horse power, year and serial number.


Q:
Is this clip for a alpha one gen 2 lower unit?
A:
Yes these are for the Mercruiser Gen II outdrive.


Q:
Does serria 18-3424 come with seal?
A:
No, the 18-3424 would only be the housing itself.


Q:
Do you have one for a 25 hp mercury?
A:
We can take a look, but we will need to know engine serial number. Let us know if you can provide that.


Q:
Will this fit on a 84 black max 150 hp?
A:
Yes it will, just keep in mind this is zinc.


Q:
Will this trim tab work on a 1981 898?
A:
Yes it will work. You will just need to confirm if the material is what you need. Zinc is for salt water.


Q:
What is the Dia. on the 31640 ?
A:
The measurements are as follows: Length: 7"; Diameter: 6-1/2"; Width: 6"; Height: 3-1/2"


Q:
Mine is diameter 4" 92 40 2 stroke mercury classic do you have this one?
A:
Serial number is needed to find correct anode. Give us a call at 1-800-914-1123 if you have further questions. http://www.iboats.com/Mercury-Trim-Tab-Anodes-and-Anti-Ventilation-Plate-Anodes/dm/view_id.1104573


Q:
Where are dimensions? 87 Mercruiser 3.0. is 3.5" diameter. What do I order?
A:
Length: 7", Diameter: 6-1/2", Width: 6", Height: 3-1/2". We can only cross reference OEM number so we would need serial number to access parts diagram. This should work if you have the Alpha Outdrive. Contact us at the number at the top of the page and we can look into it further if needed.


Q:
Will this fit a 1997 40hp force outboard product 31640?
A:
Hi Andrew- This Sierra trim tab anode will work for the 1997 40 hp Force outboard engine.


Q:
What do you have to fit a 2003, 50 hp johnson.2 cyl small gear case?
A:
This particular trim tab is best for Honda/Mercury applications. We unfortunately do not currently have anything that will match your Johnson application.


Q:
I have a 1982 mercury 150 black max will this fit?
A:
Yes it will, just keep in mind this is zinc.


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Your Price: $3.27
Save: $1.72
(34% Off $4.99)
Part # 18-3115 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • MERCURY MARINE 48753
Your Price: $27.11
Save: $13.38
(33% Off $40.49)
Part # 18-3424 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • MERCURY MARINE 46-77177A1
Shift Shaft Washer - Sierra
Your Price: $2.99
Save: $4.46
(59% Off $7.45)
Part # 18-2316-9 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • MERCURY MARINE 12-77674
For: Mercruiser Gen II Drives with Ratios 1.47, 1.62, 1.81 & 1.94. (1998 & up), (0L100040 & up)
1/8" Thick
Used over P/N 18-2349
Package of 5
Your Price: $10.00
Save: $3.49
(25% Off $13.49)
Part # 18-2011 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Shaft Size - 0.750"
Outer Diameter - 1.250"
Width - 0.312"

Replaces OEM part #
  • MERCURY MARINE 26-90562
Your Price: $2.24
Save: $2.74
(55% Off $4.98)
Part # 18-2824-9 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Replaces OEM part #
  • MERCURY MARINE 27-19551
  • MERCURY MARINE 27-32770

Package of 2
Your Price: $10.99
Save: $5.05
(31% Off $16.04)
Part # 18-3204-9 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • MERCURY MARINE 14-76281
    Pkg of 10

    Tab Washer for Mercury, Mariner 14-76281, GLM 21220

Your Price: $2.11
Save: $0.38
(15% Off $2.49)
Part # 18-7115 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Dimensions ( in )
I.D. 1.735
Width: .135

Replaces OEM part #
  • OMC 302588
  • MERCURY MARINE 25-26722
Your Price: $3.99
Save: $1.99
(33% Off $5.98)
Part # 18-2833-9 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • MERCURY MARINE 27-99777-2
Package of 2
Use with Elbows: 18-1971, 18-1978 & 18-1972. Included in 18-4362 mounting kit
Your Price: $13.96
Save: $7.03
(33% Off $20.99)
Part # 18-2155 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • MERCURY MARINE 23-77631A2
  • 35-200 HP
Your Price: $2.59
Save: $0.40
(13% Off $2.99)
Part # 18-3107 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Hurry! Only 1 left in stock
Replaces OEM part #
  • MERCURY MARINE 54705
  • MERCURY MARINE 32768
Your Price: $15.58
Save: $7.41
(32% Off $22.99)
Part # 18-3118 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • MERCURY MARINE 46-77822A1
Your Price: $6.46
Save: $2.53
(28% Off $8.99)
Part # 18-0539 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Replaces OEM part #
  • MERCURY MARINE 37721
Your Price: $1.88
Save: $0.90
(32% Off $2.78)
Part # 18-2945-9 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • OMC 307552
  • MERCURY MARINE 12-19183
  • MERCURY MARINE 12-19183 2
  • MERCURY MARINE 12-20260
  • MERCURY MARINE 12-20260B
  • MERCURY MARINE 12-19183B
  • MERCURY MARINE F8077
  • MERCURY MARINE F50556
  • MERCURY MARINE F8186
  • MERCURY MARINE 12-191833
Package of 2
Used in most lower units and sea water pumps
Used with 18-2244 Seal Ring Gasket
Rubber Washer - Sierra
Your Price: $4.00
Save: $5.21
(56% Off $9.21)
Part # 18-2948-9 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Replaces OEM part #
  • MERCURY MARINE 12-49221
  • MERCURY MARINE 12-49221-1
For plastic flush screw and fuel tank vent
Package of 5
Your Price: $9.29
Save: $2.67
(22% Off $11.96)
Part # 18-3702 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • MERCURY MARINE 11-69578T1
  • MERCURY MARINE 11-69578Q1
  • MERCURY MARINE 11-69578A1
Contains:
  • (2) 18-3204 Tab Washer, replaces O.E.# 14-76281
  • (1) 18-3704 Prop-Nut, replaces O.E.# 11-69578
Your Price: $10.99
Save: $2.30
(17% Off $13.29)
Part # 18-3702D 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Replaces OEM part #
  • MERCURY MARINE 11-69578T1
  • MERCURY MARINE 11-69578Q1
  • MERCURY MARINE 11-69578A1

  • Contains:

  • 18-3204 Tab Washer, replaces O.E.# 14-76281
    18-3704 Prop-Nut, replaces O.E.# 11-69578
Your Price: $37.68
Save: $30.31
(44% Off $67.99)
Part # 18-2654 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • MERCURY MARINE 26-79831A1

Contains:
( 1 ) 18-2008 Oil Seal, replaces O.E.# 25-56788
( 1 ) 18-2011 Oil Seal, replaces O.E.# 26-90562
( 1 ) 18-2048 Oil Seal, replaces O.E.# 26-24590
( 1 ) 18-2051 Oil Seal, replaces O.E.# 26-69188
( 1 ) 18-2052 Oil Seal, replaces O.E.# 26-69189
( 1 ) 18-2054 Oil Seal, replaces O.E.# 26-816464
( 1 ) 18-2055 Oil Seal, replaces O.E.# 26-79831
( 1 ) 18-2823 Lower Water Pump Base to Face Plate Gasket, replaces O.E.# 27-32769
( 1 ) 18-2824 Upper Face Plate to Pump Body Gasket, replaces O.E.# 27-19551
( 1 ) 18-2825 Water Pump Base Gasket, replaces O.E.# 27-32770
( 1 ) 18-2841 Water Pump Base Gasket, replaces O.E.# 27-19552, 27-77417
( 1 ) 18-2948 Rubber Washer, replaces O.E.# 12-49221-1
( 1 ) 18-7153 O-Ring, replaces O.E.# 25-25439
( 1 ) 18-7155 O-Ring, replaces O.E.# 25-26855
( 1 ) 18-7160 O-Ring, replaces O.E.# 25-31986
( 1 ) 18-7197 O-Ring, replaces O.E.# 25-29619
( 1 ) 18-7115 O-Ring, replaces O.E.# 25-26722
( 2 ) 18-2945 Drain Screw Gasket, replaces O.E.# 12-20260, 12-19183

Spring Clip - Sierra
Your Price: $1.63
Save: $1.35
(45% Off $2.98)
Part # 18-4295-9 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Replaces OEM part #
  • MERCURY MARINE 53-29641
Package of 2
For: Mercruiser Gen II
Your Price: $8.63
Save: $4.86
(36% Off $13.49)
Part # 18-6011 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • HONDA 41107-ZW1-003ZA
  • MERCURY MARINE 31640Q 4
  • MERCURY MARINE 31640A1

Zinc
For: Mercury inline 3, 4 & 6 Cyl, & V6 Outboards; Mercruiser R/MR/Alpha One (Sterndrive & Transom Assembly 1983-90) & prior drives

Dimensions:

  • Length: 7"
  • Diameter: 6-1/2"
  • Width: 6"
  • Height: 3-1/2"
Your Price: $10.98
Save: $4.01
(26% Off $14.99)
Part # 18-2052 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Shaft Size - 0.875"
Outer Diameter - 1.314"
Width - 0.322"

Replaces OEM part #
  • MERCURY MARINE 26-69189
Your Price: $7.05
Save: $3.94
(35% Off $10.99)
Part # 18-2055 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Shaft Size - 0.750"
Outer Diameter - 1.127"
Width - 0.149"

Replaces OEM part #
  • MERCURY MARINE 26-79831
Your Price: $12.99
Save: $4.10
(23% Off $17.09)
Part # 18-4233 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • MERCURY MARINE 73345A1
  • MERCURY MARINE 12-92647M
  • MERCURY MARINE 73345
    ( 35 - 70 HP )
Your Price: $12.72
Save: $5.27
(29% Off $17.99)
Part # 18-3007 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM part #
  • MERCURY MARINE 47-89983T
  • MERCURY MARINE 47-89983
  • MERCURY MARINE 47-65959
  • MERCURY MARINE 47-20268
Your Price: $4.06
Save: $5.89
(59% Off $9.95)
Part # 18-7153-9 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Pkg of 5

Dimensions ( in )
I.D. .0860
Width .100

Replaces OEM part #
  • OMC 3852565
  • OMC 911851
  • MERCURY MARINE 25-21836
Mercury Marine 26-76384 replacement parts
Your Price: $6.79
Save: $3.20
(32% Off $9.99)
Part # 18-2054 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Shaft Size - 0.375"
Outer Diameter - 0.750"
Width - 0.243"

Replaces OEM part #
  • HONDA 91253-ZW1-003
  • MERCURY MARINE 26-816464
Your Price: $1.98
Save: $1.01
(33% Off $2.99)
Part # 18-2244 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Replaces OEM Part #
  • MERCURY MARINE 10-79953A2
  • MERCURY MARINE 10-79953Q2
For: Mercruiser #1/R/MR/Alpha I Gen II (Both Upper and Lower Units)
Your Price: $7.63
Save: $5.86
(43% Off $13.49)
Part # 18-2051 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
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Shaft Size - 0.875"
Outer Diameter - 1.253"
Width - 0.278"

Replaces OEM part #
  • MERCURY MARINE 26-69188
Your Price: $2.68
Save: $1.30
(32% Off $3.98)
Part # 18-2841-9 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Hurry! Only 1 left in stock
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Replaces OEM part #
  • MERCURY MARINE 27-19552
  • MERCURY MARINE 27-77417
  • Pkg. of 2
Mercury Marine 12-29245 replacement parts
Your Price: $1.36
Save: $0.63
(31% Off $1.99)
Part # 18-4275 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Hurry! Only 1 left in stock
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Replaces OEM part #
  • MERCURY MARINE 12-29245
Your Price: $9.49
Save: $7.96
(45% Off $17.45)
Part # 18-7160-9 2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 19 hrs 24 mins.
Hurry! Only 1 left in stock
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Dimensions ( in )
I.D. 2.635
Width .210

Replaces OEM part #
  • MERCURY MARINE 25-31986
Your Price: $34.79
Save: $19.88
(36% Off $54.67)
Part # 18-1162 2nd Day Air for $2 More Eligible
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Replaces OEM part #
  • MERCURY MARINE 31-38356A1