OMC Sterndrive/Cobra Thermostats

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Model/Liter

Year

Sierra Thermostat

Mallory Thermostat

90 1970 18-3554 9-43021
100 1972-1973 18-3554 9-43021
120 1969-1980 18-3554 9-43021
120 1980-1981 18-3558 -
140 1973-1980 18-3554 9-43021
140 1980-1981 18-3558 -
155 1969-1972 18-3554 9-43021
165 1972-1976 18-3554 9-43021
170 1974 18-3554 9-43021
175 1975-1977 18-3554 9-43021
185 1978-1980 18-3554 9-43021
190 1974-1977 18-3554 9-43021
200 1979-1981 18-3554 9-43021
210 1969-1972 18-3554 9-43021
215 1971 18-3554 9-43021
225 1971 18-3554 9-43021
230 1979-1981 18-3554 9-43021
235 1971 18-3554 9-43021
235 1975-1977 18-3554 9-43021
240 1978 18-3554 9-43021
245 1972-1975 18-3554 9-43021
250 1970-1973 18-3554 9-43021
250 1979 18-3554 9-43021
260 1979-1981 18-3554 9-43021
262 1989 18-3554 9-43021
305 1977-1982 18-3554 9-43021
350 1977-1982 18-3554 9-43021
350 1989 18-3554 9-43021
351 1992 18-3554 9-43021
454 1977-1982 18-3554 9-43021
460 1989 18-3554 9-43021
2.5L 1982-1988 18-3558 -
3.0L 1982-1988 18-3558 -
3.8L 1981-1985 18-3554 9-43021
4.3L 1985-1986 18-3554 9-43021
4.3L 1989-1992 18-3554 9-43021
5.0L 1982-1988 18-3554 9-43021
5.0L 1989-1992 18-3554 9-43021
5.7L 1982-1988 18-3554 9-43021
5.7L 1989 18-3554 9-43021
5.8L 1989-1992 18-3554 9-43021
7.5L 1988 18-3554 9-43021

Model/Liter

Year

Sierra Thermostat

Mallory Thermostat

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Model/Liter:
Year:
Blowout
Save 32%-38% Off.
Limited Sale Price: $14.51
Save: $7.53
(34% Off $22.04)
Part # 18-3554 ValueShip™ Eligible
Replaces OEM part #
  • OMC 383307
Limited Sale Price: $13.25
Save: $6.30
(32% Off $19.55)
Part # 18-3558 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • OMC 982554
  • VOLVO 3853799
For: 3.0L GS, GL, GLM, GLP, GSM, GSP
Limited Sale Price: $16.74
Save: $10.58
(38% Off $27.32)
Part # 18-3543 ValueShip™ Eligible
    Replaces OEM #: 5005440, 508626, 378065, 434841 and 393659
Sierra
Average Customer Review for Thermostat 160 Degrees - 18-3554 - Sierra
Full StarFull StarFull StarFull StarFull Star Based On 1 Review | Write Review
Full StarFull StarFull StarFull StarFull Starjust what I needed...
by David from Plano, Texas on October 14, 2013
hard to find parts for obsolete boat and outdrive. thanks for stocking this stuff.
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Average Customer Review for Thermostat - 18-3543 - Sierra
Full StarFull StarFull StarFull StarFull Star Based On 4 Reviews | Write Review
Full StarFull StarFull StarFull StarFull StarThermostat for 1979 Johnson 55 HP
by Dan from Lansing, Illinois on July 27, 2015
Perfect fit! I did test the outlet water temperature in the yard via garden hose muffs. Tested fine. Yesterday, I took the boat to a cooling lake for one of Com Eds nuclear power plants. Tested great. Surface temperatures were from 96F-103F!
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Full StarFull StarFull StarFull StarFull Starthermostat
by Mike from Marlton, New Jersey on April 26, 2015
what can I say its a thermostat rite size well built
(1 of 1 people found this review helpful)
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Full StarFull StarFull StarFull StarFull StarThermostat
by Charles from Suffolk, Virginia on June 02, 2014
Outstanding product
(2 of 2 people found this review helpful)
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Full StarFull StarFull StarFull StarFull StarGOOD PRODUCT
by Charles from Suffolk, Virginia on May 12, 2014
I love this website
(2 of 2 people found this review helpful)
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Q:
Does it come with rubber seal and gasket?
A:
It is the thermostat only.
Q:
Dimensions of this thermostat? Height below and above the flange?
A:
Sierra does not have that information. We can only match up thermostat by application and OEM number. If you can call us at the number at the top of the page with your engine model number we can take a look.
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