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Sierra Thermostat

Sierra Thermostat Kit

5 1965-1968 18-3543 18-3672
5 1986 18-3543 18-3672
5.5 1959-1964 18-3543 18-3672
6 1965-1979 18-3543 18-3672
6 1986 18-3543 18-3672
7.5 1980-1986 18-3543 18-3672
8 1986 18-3543 18-3672
9.5 1964-1973 18-3543 18-3672
9.9 1974-1986 18-3543 18-3672
10 1959-1963 18-3543 18-3672
15 1974-1986 18-3543 18-3672
18 1959-1973 18-3543 18-3672
20 1981-1994 18-3543 18-3672
25 (2)1969-1994 18-3543 18-3672
28 1989-1994 18-3543 18-3672
30 1986-1994 18-3543 18-3672
35 1959 18-3543 18-3672
35 1976-1994 18-3543 18-3672
40 1960-1969 18-3543 18-3672
45 1989-1992 (4)18-3543 18-3672
50 1971-1975 18-3543 18-3672
50 1979 18-3543 18-3672
50 1981-1986 18-3543 18-3672
55 1976-1992 (3)18-3543 18-3672
60 1969-1970 18-3557 18-3669
60 1980-1986 18-3543 18-3672
60, 60TTL 1993 18-3561 -
65 1971-1973 18-3557 18-3669
65 1993 18-3561 -
65C 1984-1986 18-3557 18-3669
65 Jet 1994-1995 18-3543 18-3673
70 1974-1986 18-3557 18-3669
70, 70TTL 1993 18-3561 -
75 1978-1988 18-3557 18-3669
80 Jet 1994-1995 18-3543 18-3673
85 1978-1980 18-3543 18-3673
85 1993-1995 18-3543 18-3673
88 1987-1995 18-3543 18-3673
90 (1)1983-1995 18-3543 18-3673
90 2004-2006 18-3544 -
90 Jet 1994 18-3543 18-3673
100 1979-1980 18-3543 18-3673
100 1990-1995 18-3543 18-3673
100 Comm 1984-1995 18-3543 18-3673
105 2003 18-3544 -
110 1985-1989 18-3543 18-3673
112 1994-1995 18-3543 18-3673
115 (1)1978-1995 18-3543 18-3673
115 2002-2006 18-3544 -
140 1978-1985 18-3543 18-3673
150 1978-1991 18-3543 18-3672
150 1993-1994 18-3544 -
150 2002-2006 18-3544 -
155 1984-1991 18-3543 18-3672
175 1977-1991 18-3543 18-3672
175 1994 18-3544 -
175 2002-2006 18-3544 -
185 1984-1985 18-3543 18-3672
200 1977-1983 18-3543 18-3672
200 2000-2001 18-3546 -
225 2000-2001 18-3546 -
235 1978-1985 18-3543 18-3672
250 2000-2001 18-3546 -

HP

Years

Sierra Thermostat

Sierra Thermostat Kit

Notes:
  • (1) : Except 60 degree models
  • (2) : All 1989-91 models except DR & DT
  • (3) : Commercial also
  • (4) : Commercial
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Part # 18-3669
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Part # 18-3669D
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Johnson Thermostat Kits
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Part # 18-3672
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Part # 18-3672D
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Part # 18-3673
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Part # 18-3673D
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Part # 18-3674
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Sierra
Average Customer Review for Sierra 18-3672 - Thermostat Kit
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Based On 15 Reviews | Write Review
Full StarFull StarFull StarFull StarFull Star
great product and fast service
by Bob from Billingsley, Alabama on August 10, 2015
great product and fast service
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Great Inventory
by Doug from Bethel Island, California on May 26, 2015
Have an older 1969 Johnson outboard great to have access to parts I need, so far parts have been on time, and fit ......Thank You
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always have the parts you need
by Gregory from Grayson, Kentucky on May 25, 2015
if you need parts this is the place to shop and buy. always has great selection of hard to find parts at a good price
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Full StarFull StarFull StarFull StarFull Star
my thermostat kit
by Kenneth from Regina, Kentucky on April 21, 2015
parts was exactly as I ordered and shipped fast as well totally satisfied
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Full StarFull StarFull StarFull StarFull Star
Thermostat Kit - Sierra
by Kenneth from Humble, Texas on August 21, 2013
Found the part online with no problem. everything I needed was in the package.
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Full StarFull StarFull StarFull StarFull Star
No Problems
by David from Phoenix, Arizona on July 17, 2013
Correct Part and Work Fine
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Full StarEmpty StarEmpty StarEmpty StarEmpty Star
Overheated
by Joshua from Camden, New York on June 23, 2013
This thermostat failed to open and my engine overheated. I have never been disappointed with Sierra products until now. Now my engine is running poorly and I'm hoping the head gasket let loose before the rings got cooked. 1973 Evinrude 25HP
(1 of 1 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
You NEED a Thermostat--Do Not Just Take It OUT
by Raymond from Fort Pierce, Florida on November 13, 2012
Got my part in TWO Days what more could you ask for
(1 of 1 people found this review helpful)
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Thermostats
by Joe from Johnsburg, Illinois on October 18, 2012
Solved my cooling problems good quality.
(3 of 3 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
JUST WHAT THE MOTOR ORDERD
by Toby from Costa Mesa, California on November 11, 2011
FIT - WORKS GREAT - FAST SHIPPING
(1 of 1 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
Just what I Ordered
by Clifford from Madras, Oregon on October 26, 2011
Exact fit!
(1 of 1 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
Follow up to previous review - Mercury 150 outboard
by Anthony from Key Largo, Florida on September 20, 2011
Iboats did provide me a refund for this thermostat kit...took approximately 2 months, but in the end they did come through.
(1 of 1 people found this review helpful)
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Full StarEmpty StarEmpty StarEmpty StarEmpty Star
Wrong Thermostat Kit for Mercury Outboard
by Anthony from Key Largo, Florida on August 26, 2011
According to the iboat website, this thermostat kit is compatible with my 1993 Mercury 150HP outboard...it isn't! Save yourself the aggravation of water spraying out between the thermostat housing and the valve covers and being told that the parts are not refundable unless they are defective. I'm certain that these thermostat kits do work in some engines, just not in the outboard iboat's website references. Too bad this review does not allow criticism of iboat's customer service... I'm still waiting to see if I'll receive a refund due to their error!
(3 of 3 people found this review helpful)
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No gasket included
by John from Lancaster, New York on June 23, 2010
This kit does not include a gasket as stated in the discription.
(5 of 5 people found this review helpful)
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Review for Thermostat Kit for Johnson/Evinrude 310058 434841, Mercury/Mariner 75692, GLM 1
by a Customer on February 02, 2009
(2 of 6 people found this review helpful)
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Average Customer Review for Sierra 18-3673 - Thermostat Kit
Full StarFull StarFull StarFull StarEmpty Star
Based On 13 Reviews | Write Review
Full StarEmpty StarEmpty StarEmpty StarEmpty Star
Thermostat
by Edward from Roswell, New Mexico on May 26, 2016
I ordered thermostats on the 23rd and paid for 2 day delivery. Called Iboats on the 26 th and they said my parts was on back order. Terrible service
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Full StarFull StarFull StarFull StarFull Star
good quality product
by Moreno from Hamilton, New Jersey on May 24, 2016
would definitely buy again
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Full StarFull StarFull StarFull StarFull Star
AWESOME
by a Customer from Robson, British Columbia on December 04, 2015
I don't see where it says OEM, But It shore looks like it is . . . AWESOME Set . . .
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Full StarFull StarFull StarFull StarFull Star
just fine
by Charles from Wilmington, Delaware on July 18, 2015
product arrived in 2 days. installed the next day and engine is running fine (overheated before).
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Full StarFull StarFull StarFull StarFull Star
thermostat kit
by Brian from Shelbyville, Tennessee on June 09, 2015
Everthing was great. Product was just like it said it was
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Full StarEmpty StarEmpty StarEmpty StarEmpty Star
Gasket
by Theodore from Jonesboro, Georgia on March 17, 2015
Gasket no good have to by new one
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Satisfied
by Mark from Tyrone, Pennsylvania on July 03, 2014
Received the parts promptly and all seems to be in order. Have not installed will keep as back up spare parts.
(1 of 1 people found this review helpful)
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T-stat
by Robert from Thorsby, Alberta on October 29, 2013
👍
(0 of 1 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
Henry
by Henry from Douglasville, Georgia on June 03, 2013
everything arrived on a timely basis and it was the correct product
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Full StarFull StarFull StarFull StarFull Star
Thermostat Kit for Johnson/Evinrude, GLM 13270 - Sierra
by Phyllis from Riverside, Alabama on August 21, 2012
All there good kit.
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Full StarFull StarFull StarFull StarFull Star
Thermostat
by Edward from Lake Katrine, New York on January 06, 2012
worked like a charm....and very fast shipping....thanks
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Full StarFull StarFull StarEmpty StarEmpty Star
thermostat kit
by Brad from West Fargo, North Dakota on September 29, 2011
there was no kit listed for my motor so we gave it our best guess, but the parts did not fit and returned them. The kit did look complete.
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Full StarFull StarFull StarFull StarFull Star
Great product!
by Dean from Honolulu, Hawaii on August 21, 2011
Shipped fast. Installed on my 115hp Evinrude and it works perfectly.
(4 of 5 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
Based On 1 Review | Write Review
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Thermostat Kit for Johnson
by Allen from Wauchula, Florida on November 04, 2014
It is a nice kit with everything you need to replace the orignal. I recommend it for anyone that needs to replace theirs.
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Q:
Does 18-3672D work on a 1995 200 HP Johnson 2 stroke?
A:
No it will not work with your engine. You need 18-3545 and 18-0412-9 for the thermostat diaphragm cover.


Q:
Location of thermostat on a 1977 johnson 55hp modle number/55EL77D?
A:
It's at the block around the cylinder head.


Q:
Location of thermotat on 1973 50 hp johnson?
A:
It installs onto the cylinder head. So it will be right there.


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