iboats - The #1 Store For Everything Boating
Cool Comfort Sale
Shop by Brand

Happy Holidays

Sierra

yamaha gearcase exploded view
Yamaha Gearcase Exploded View Diagram and Parts
Fits 40 &50 HP (1984-1991)
Figure #DescriptionO.E.M. #Sierra #Qty.
1Bolt, Water Pump Housing97575-08675-00 2
2Washer, Water Pump Housing92990-08600-00 4
3Housing, Wapter Pump663-44311-02-00 1
4Insert, Water Pump663-44322-00-00 18-3435 11
5Impeller6H4-44352-02-00 18-3068 11
6Gasket, Wear Plate to Water Pump663-44315-A0-00 18-0292 221
7Wear Plate, Water Pump663-44323-00-00 1
8Gasket, Wear Plate to Water Pump663-44324-A0-00 18-0294 221
9Base, Water Pump663-44341-0094 1
10Gasket, Pump Base663-44316-A0-00 1
11O-Ring, Pump Base93210-41042-00 18-0298 21
12Oil Seal, Pump Base93101-23070-00 18-0297 22
13 Bolt, Water Pump Housing97395-08045-00 18-0256 22
14Water Pump Repair Kit6H4-W0078-00-00 18-34291
15Water Seal663-44366-00-00 1
16Drive Shaft (short)6H4-45501-00-00 1
16Drive Shaft (long)6H4-45501-10-00 1
17Bearing, Tapered Roller93332-00079-00 1
18Shim (0.5mm)663-45587-00-05 A R
18Shim (0.8mm)663-45587-00-08 A R
18Shim (0.12mm)663-45587-01-12 A R
18Shim (0.30mm)663-45587-01-30 A R
18Shim (0.50mm)663-45587-01-50 A R
19Sleeve, Drive Shaft6H4-45536-00-0 1
20Bearing, Needle93315-32224-00 1
21Bearing (not used 1988 & later)663-45552-00-00 1
23Nut, Pinion Gear90170-12138-00 1
24Key, Woodruff90280-03024-00 18-3305 21
25Gearcase Sea Kit6H4-W0001-20-00 18-27921
26Bolt Plate97095-06016-00 1
27Washer, Plate92990-06600-00 1
28Plate6H4-45321-01-00 1
29O-Ring, Plate 93210-49046-00 1
30Shift Cam Assembly (short shaft)6H4-44150-12-00 1
31O-Ring, Plate93210-66M98-00 18-3305 21
32Shift Cam Assembly (long shaft)90340-08M04-00 2
33Plug, Vent93606-12019-00 2
34Pin, Dowel90430-08020-00 3
35Nut, Nylock90185-05904-00 1
36Cover, Water Inlet (stbd)688-45215-02-00 92990-10100-00 1
37Washer, Locking92990-10100-00 4
38Bolt97078-10040-00 4
39Bearing, Ball93306-00702-00 1
40Plug, Drain688-45341-00-00 1
41Propellervarious 1
42Bolt, Trim Tab97575-08675-00 1
43Casing, Lower6H4-45301-01-EK 1
44Washer, Locking92990-08100 1
45Bolt, Lower Casing97095-08085-00 1
46Tab, Trim664-45371-01-00 1
47Seal, Rubber688-45375-00-00 1
48Guide, Seal Rubber663-45376-00-94 1
49Screw Ovalhead98780-05535-00 1
50Cover, Water Inlet (port)668-45214-02-00 1
51Shim Forward Gear (0.5mm)6H4-45567-00-05 1
51Shim Forward Gear (0.8mm)6H45567-00-08 AR
51Shim Forward Gear (0.12mm)6H4-45567-01-12 AR
51Shim Forward Gear (0.50mm)6H4-45567-01-50 AR
52Bearing, Tapered Roller93332-000V4-00 1
53Gear, Forward6H4-4556-00-00 1
54Pin, Cross (clutch dog)90250-06023-00 1
55Clutch, Sliding663-45631-01-00 1
56Retainer Ring, Cross Pin663-45633-00-00 1
57Plunger, Shift676-45635-00-00 1
58Slide, Shift663-45634-00-00 1
59Spring, Compression60501-16M01-00 1
60Shaft, Propeller679-45611-01-00 1
61Washer, Plate90201-22429-00 1
62Gear, Reverse6H4-45571-00-00 1
63Shim Reverse Gear (0.5mm)663-45577-00-05 AR
63Shim Reverse Gear (0.8mm)663-45577-00-08 AR
63Shim Reverse Gear (0.12mm)663-45577-01-12 AR
63Shim Reverse Gear (0.50mm)663-45577-01-50 AR
64Washer, Thrust663-45576-00-00 1
65Pin, Cotter91490-30030-00 18-23801
66Nut, Castle90171-16011-00 1
67Washer92990-16200-00 1
68Spacer, Prop Mounting (aft)670-45997-02-00 1
69Spacer, Prop Mounting (fore)663-45987-02-00 1
70Nut, Cover697-45384-00-00 1
71Washer, Tab90214-48M03-00 1
72Oil Seal, Bearing Housing93101-22067-00 18-0296 22
73Bearing, Needle93317-22204-00 1
74Key, Bearing Housing90282-04010-00 1
75Housing, Bearing679-45331-0094 1
1Contents of Water Pump Repair Kit 18-3429
2Contents of Gear Housing Seal Kit 18-2792
ARAs required

This product typically leaves our warehouse in 1 business day.

To determine the shipping cost and estimated delivery date for this item click Add to Cart, then click Calculate Shipping inside your shopping cart.

General Policy

We work hard to provide you with the best value in product prices and shipping charges, and to get your order to you in a timely, safe, and convenient manner. Internet sales involve the cost of getting the product to you, and shipping carriers base that cost on the size and weight of the package, plus the distance the package travels from our warehouse to your door. We keep our product prices low, negotiate low shipping charges from our carriers and pass those savings on to you, and we don't charge sales tax (except for residents of Utah), so your order from iboats.com is the best value for all your boating needs.

Our standard shipping method is UPS ground, which typically takes 2-5 additional transit days after the order has left our warehouse, depending on your delivery address. We also offer other shipping options, including expedited delivery, and the actual delivery date will depend on the shipping options you choose.

Shipping to Canada

Most products sold by iboats.com can be purchased and shipped to Canada. Some restrictions apply to certain items, such as hazardous materials, over-weight products, and the method of shipping. Available product lines, shipping rates and fees may vary depending on the delivery address for your order.

Currently, iboats.com offers ground shipping to all Canada provinces. Our Canadian brokerage service accelerates your orders through the Customs clearance process and facilitates the delivery of your order through Canada Post or the best method based on your shipping address. We do not currently offer expedited shipping methods to Canada.

At iboats.com we want to simplify your transaction and give you a pleasing purchasing experience so you'll come shop with us again and again. We therefore calculate all the duties, taxes, and other fees specific to Canadian orders and show you the total landed cost of getting the order to your door. There are no hidden fees and will be no surprise COD charges when the package is delivered to you.

Order History & Tracking

We provide several methods to track your order and keep you informed of your order status and expected delivery date. After completing an iboats.com purchase transaction, an account will automatically be created for your provided email address. You'll receive an email from iboats.com Customer Service informing you of your new User Account and the many benefits it provides. If you don't wish to have an iboats.com Account with password, do nothing and your account won't be registered; however, you can respond to the instructions in the email and easily register your account and setup a password. This will allow you to sign in to your account by choosing the Order Status link from any iboats.com page, where you can browse your order history and track the status of all your orders - tracking numbers are displayed that link to the delivery carrier's tracking webpage.

If you have provided your email address during checkout, we will also email you your invoice, which includes a link for tracking your order and viewing the current status of your order. Refer to your invoice email and tracking link any time you wish to track the status of your order

Friendly Return Policy

  • If the merchandise you received was defective, damaged, or an error was made by iboats.com, simply return the merchandise within 30 days of the original shipping date for a full refund.
  • See the specific requirements and instructions below for United States or Canadian orders.

Returns for U.S. Customers

We want to make it as easy as possible for you to return an unwanted item; after all, we want you to return again and again as a satisfied iboats.com customer, and to also continue recommending us to your friends.

As mentioned above, if the merchandise you received was defective, damaged, or an error was made by iboats.com, simply return the merchandise within 30 days of the original shipping date for a full refund. Merchandise must still be in brand-new, unused condition with all original packaging in good condition; plus parts, accessories, manuals, and/or warranty cards included. Please note that all return merchandise must be accompanied by an RA (Return Authorization) number issued by iboats.com. To receive your RA number simply call our Returns Department toll-free at 1-800-914-1123 or email us at returns@iboats.com.

If for some reason you need to return merchandise for reasons other than those mentioned above, follow the same procedures, obtaining an RA number from iboats.com, within 30 days of the original shipping date. Please note that there may be restocking fees, shipping costs, or product change order costs associated with some returns. Feel free to check with the iboats.com Returns Department for specific terms, conditions, and eligibility.

Returns for Canadian Customers

We request that all Canadian customers verify and re-check that the products you are ordering are what you want and are correct for your application or intended use. iboats.com does not accept any return merchandise on Canadian orders, unless the merchandise you received was defective, damaged, or an error was made by iboats.com. In such cases, return the merchandise within 30 days of the original shipping date for a full refund, following the procedures below.

Canadian orders involve many additional costs dealing with Customs, Provincial taxes, brokerage fees, and more, making product returns complicated and very expensive and costly for both the customer and iboats.com. Again, help us serve you best by verifying that the products you are ordering are what you want so we don't have any costly returns or have to deny a return.

If a return meets the criteria mentioned above, merchandise must still be in brand-new, unused condition with all original packaging in good condition; all parts, accessories, manuals, and/or warranty cards included. Please note that all return merchandise must be accompanied by an RA (Return Authorization) number issued by iboats.com. To receive your RA number call our Customer Service Department toll-free at 1-800-914-1123, Tuesday-Friday, 10am-7pm EST, or email us at returns@iboats.com. We will provide further details on where and how to mail the merchandise. Please note that returns sent from rural Canadian addresses may take up to five weeks to process after the package is mailed.

iboats.com Low Price Guarantee – Quick and Simple

We have the best selection of products at the best prices, guaranteed. 

Nobody beats our prices. If you find a current lower price on an identical, in-stock item from any nationally recognized marine Internet retailer, we will match the price. iboats.com works hard to bring you everyday low prices plus knowledgeable product advice, great in-stock selection, and outstanding customer service. Our guarantee covers it all, and if you’ve found a better price let us know and we’ll match it and work hard to make you a satisfied iboats customer for life.

  Quick:  Call 1-800-914-1123

  Simple:  Have the lower competitive price info ready, as outlined below.

  Buy with Confidence – We Won’t Be Beat!

 

Here’s what you need to supply us to verify a lower price:

  1. The retailer’s name and URL website address of where you found the lower price.
  2. The product name, manufacturer, model number, price, and shipping charges.
  3. Electronics products, trolling motors, and outboard engines are not available for price matching.

 

30-day Guarantee
Buy now with confidence, knowing that should there ever be a lower price from any nationally recognized U.S. marine Internet retailer for 30 days after your purchase, iboats will match that price and refund you the difference. Or we’ll match the price before your purchase. The price considered will be the advertised price plus shipping and handling charges.

Qualifying items must be verifiable on the Internet or through a current printed advertisement. Items must be identical, in-stock new products and not sold through a membership club or auction site or any of the following offers, such as free offers, multiple discounts like “buy one, get one at half off”, special orders, special bundles, clearance sales, mail-in rebate offers, typographical errors, private sales, non-retail websites, promo discounts, or limited-time offers.  All price matching is at the discretion of iboats.com and is subject to change at any time. iboats reserves the right to limit quantities. Price-match products are not eligible for special offers or discounts.

iboats.com – The Leader in Price Buster Confidence!

Do you need Professional Installation? iboats.com has teamed with a national network of independent installers that are ready to handle your installation needs.
Find your local Amtech dealer:
yamaha gearcase exploded view-sierra 18-3435 insert cup

Sierra 18-3435 Insert Cup
Part # 18-3435
Our Price: $7.99
Compare at $8.99



Replaces OEM part #

  • YAMAHA 663-44322-00-00

Low Price Guarantee
yamaha outboard bolts

Sierra 18-0256 Bolt
Part # 18-0256
Our Price: $2.99



Replaces OEM part #

  • YAMAHA 97095-08045-00
Bolt Dimensions: 8-1.25 x 45mm

Low Price Guarantee
yamaha gearcase exploded view-sierra 18-3429 water pump repair kit

Our Price: $26.99
Compare at $31.99



Replaces OEM part #

  • YAMAHA 6H4-W0078-A0-00
  • YAMAHA 6H4-W0078-00-00
Contains:
    (1) 18-0292 Wear Plate to Gear Case Mounting Gasket - replaces O.E. # 688-44315-A0-00
    (1) 18-3435 Insert Cup - replaces O.E. # 663-44322-00-00
    (1) 18-0294 Wear Plate to Pump Base Gasket - replaces O.E. # 663-44324-A0-00
    (1) 18-3068 Impeller - replaces O.E. # 6H4-44352-02-00, 6H4-44352-00-00
    (2) 18-0256 Bolt - replaces O.E. # 97395-08045-00
    (1) 18-3436 Impeller Plate - replaces O.E. # 663-44323-00-00

Low Price Guarantee
yamaha gearcase exploded view-sierra 18-3305 impeller key

Our Price: $3.99
Compare at $4.69



Replaces OEM part #

  • MERCURY MARINE 28-81912M
  • YAMAHA 90280-03024
  • for Mercury/Mariner models: 6C-D, 8C, 9.9c, 15C

Low Price Guarantee
yamaha gearcase exploded view-sierra 18-0296 oil seal

Sierra 18-0296 Oil Seal
Part # 18-0296
Our Price: $5.99
Compare at $6.49



Shaft Size - 0.866"
Outer Diameter - 1.417"
Width - 0.236"

Replaces OEM part #

  • MERCURY MARINE 26-82233M
  • MERCURY MARINE 26-83406M
  • YAMAHA 93101-22067-00

Low Price Guarantee
yamaha outboard water pump gaskets

Our Price: $2.99



Replaces OEM part #

  • MERCURY MARINE 27-81417M
  • YAMAHA 663-44315-A0-00

Low Price Guarantee
yamaha gearcase exploded view-sierra 18-2380 cotter pin

Sierra 18-2380 Cotter Pin
Part # 18-2380
Our Price: $10.99
Compare at $12.49



Replaces OEM part #

  • YAMAHA 91490-30030
Package of 10

Low Price Guarantee
yamaha gearcase exploded view-sierra 18-0297 oil seal

Sierra 18-0297 Oil Seal
Part # 18-0297
Our Price: $4.99
Compare at $5.99



Shaft Size - 0.906"
Outer Diameter - 1.457"
Width - 0.236"

Replaces OEM part #

  • MERCURY MARINE 26-82234M
  • YAMAHA 93101-23070-00

Low Price Guarantee
yamaha gearcase exploded view-sierra 18-0294 wear plate to pump base gasket

Our Price: $5.99
Compare at $6.49



Replaces OEM part #

  • MERCURY MARINE 27-81421M
  • YAMAHA 663-44324-A0-00
  • Pkg. of 2

Low Price Guarantee
yamaha gearcase exploded view-sierra 18-0298 o-ring

Sierra 18-0298 O-Ring
Part # 18-0298
Our Price: $2.99



Dimensions ( mm )
I.D. 41.50
Width 3.0

Replaces OEM part #

  • MERCURY MARINE 25-82275M
  • YAMAHA 93210-41042-00

Low Price Guarantee
yamaha gearcase exploded view-sierra 18-3068 impeller

Sierra 18-3068 Impeller
Part # 18-3068
Our Price: $15.99
Compare at $24.99



Replaces OEM part #

  • YAMAHA 6H4-44352-00-00
  • YAMAHA 6H4-44352-02-00
For: Yamaha 30, 40, 50 hp.

Low Price Guarantee
yamaha gearcase exploded view-sierra 18-2792 seal kit

Sierra 18-2792 Seal Kit
Part # 18-2792
Our Price: $29.99
Compare at $34.99



Replaces OEM part #

  • YAMAHA 6H4-W0001-C0-00
  • YAMAHA 6H4-W0001-21-00
  • YAMAHA 6H4-W0001-20-00
Kit Contains:
    (1) 18-0292 Wear Plate to Pump Housing Gasket - replaces O.E. # 663-44315-A0-00
    (1) 18-0294 Wear Plate to Pump Base Gasket - replaces O.E. # 663-44324-A0-00
    (2) 18-4698 Drain or Fill Washer Gasket - replaces O.E. # YSG-14090-90-8G
    (2) 18-0296 Oil Seal - replaces O.E. # 93101-22067-00
    (2) 18-0297 Oil Seal - replaces O.E. # 93101-23070-00
    (1) 18-0298 O-Ring - replaces O.E. # 93210-41042-00
    (1) 18-0299 O-Ring - replaces O.E. # 93210-66M98-00
    (1) 18-0293 Pump Base to Gearcase Gasket - replaces O.E. # 663-44316-A0-00

Low Price Guarantee
 

Mallory OIL SEAL 9-76413
Part # 9-76413
Our Price: $4.99
Compare at $5.79



Replaces Original Equipment Manufacturer(OEM):Yamaha
Replaces Original Equipment Manufacturer # (OEM #):93101-23070
Fits Application:60-70

Low Price Guarantee
 

Mallory OIL SEAL 9-76411
Part # 9-76411
Our Price: $4.99
Compare at $6.29



Replaces Original Equipment Manufacturer(OEM):Yamaha
Replaces Original Equipment Manufacturer # (OEM #):93101-22067
Fits Application:50-60

Low Price Guarantee
yamaha drive system hardware-mallory pin, cotter 9-73911

Our Price: $1.99



Replaces GLM #:22090
Replaces Original Equipment Manufacturer(OEM):Yamaha
Replaces Original Equipment Manufacturer # (OEM #):91490-30030
Fits Application:4A/5C 1981-91, 5B/BS/6A/8A/B 1974-82, FT8D 2001, F9.9B 1985-95, 9.9D/15C/D/F 1978-00, FT9.9A/D 1999-05, 9.5A 1977-78, 12A/15A 1973-77, 25A 1973-79, 25/30/40/50 prop nut

Low Price Guarantee
yamaha outboard impellers-mallory impeller 9-45601

Mallory Impeller 9-45601
Part # 9-45601
Our Price: $20.99
Compare at $24.49



Replaces GLM #:89900
Replaces Original Equipment Manufacturer(OEM):Yamaha
Replaces Original Equipment Manufacturer # (OEM #):6H4-44352-02-00
Fits Application:25-50

Low Price Guarantee
Click here for more info Click here for more info Price Busting Low Price Guarantee - Click Here for details