18-3536 Thermostat for Johnson Evinrude Mercury Mariner | JLM Marine
This high-quality aftermarket thermostat is engineered to fit a wide range of Johnson, Evinrude, Mercury, and Mariner outboard motors from 4.5 HP to 300 HP, covering both 2-stroke and 4-stroke engines, including Cross Flow, Looper, Optimax, and E-TEC models. Designed for reliable temperature regulation at 143°F, this stainless steel thermostat ensures optimal engine performance across decades of outboard production (1974–2018).
This thermostat directly replaces multiple OEM part numbers including 18-3536, 833072002, 833072003, 833072004, 0377148, 0377612, 0378065, 0393659, 0434841, 0437414, 5005440, and 833072, providing broad compatibility across Johnson, Evinrude, Mercury, and Mariner engine families.
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Temperature Rating: 143 degrees Fahrenheit
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Material: Stainless steel construction for durability
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Application: Fits 2-stroke, 4-stroke, Optimax, and E-TEC engines
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand |
Part Number |
| Johnson/Evinrude/Mercury/Mariner |
18-3536 |
| Johnson/Evinrude/Mercury/Mariner |
833072002 |
| Johnson/Evinrude/Mercury/Mariner |
833072003 |
| Johnson/Evinrude/Mercury/Mariner |
833072004 |
| Johnson/Evinrude/Mercury/Mariner |
0377148 |
| Johnson/Evinrude/Mercury/Mariner |
0377612 |
| Johnson/Evinrude/Mercury/Mariner |
0378065 |
| Johnson/Evinrude/Mercury/Mariner |
0393659 |
| Johnson/Evinrude/Mercury/Mariner |
0434841 |
| Johnson/Evinrude/Mercury/Mariner |
0437414 |
| Johnson/Evinrude/Mercury/Mariner |
5005440 |
| Johnson/Evinrude/Mercury/Mariner |
833072 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here's a guide to help you identify your engine's serial/model: Johnson Serial Number Guide.
For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
| Brand |
Model |
Rated HP |
Stroke |
Years |
| Johnson/Evinrude |
2 Cyl 2.188 Bore Cross Flow |
15 |
2-Stroke |
1980-1987 |
| Johnson/Evinrude |
2 Cyl 2.188 Bore Cross Flow |
9.9 |
2-Stroke |
1974-1987 |
| Johnson/Evinrude |
2 Cyl 2.375 Bore Cross Flow |
15 |
2-Stroke |
1995 |
| Johnson/Evinrude |
2 Cyl 3.000 Bore Cross Flow |
20 |
2-Stroke |
1985-1998 |
| Johnson/Evinrude |
2 Cyl 3.000 Bore Cross Flow |
25 |
2-Stroke |
1980-2005 |
| Johnson/Evinrude |
2 Cyl 3.000 Bore Cross Flow |
28 |
2-Stroke |
1986-1996 |
| Johnson/Evinrude |
2 Cyl 3.000 Bore Cross Flow |
30 |
2-Stroke |
1984-2005 |
| Johnson/Evinrude |
2 Cyl 3.000 Bore Cross Flow |
35 |
2-Stroke |
1980-1986 |
| Johnson/Evinrude |
2 Cyl 3.187 Bore Looper |
35 |
2-Stroke |
1986-1996 |
| Johnson/Evinrude |
2 Cyl 3.187 Bore Looper |
40 |
2-Stroke |
1984-1988 |
| Johnson/Evinrude |
2 Cyl 3.187 Bore Looper |
45 |
2-Stroke |
1986-1992 |
| Johnson/Evinrude |
2 Cyl 3.187 Bore Looper |
48 |
2-Stroke |
1988 |
| Johnson/Evinrude |
2 Cyl 3.187 Bore Looper |
50 |
2-Stroke |
1980-1988 |
| Johnson/Evinrude |
2 Cyl 3.187 Bore Looper |
55 |
2-Stroke |
1981-1992 |
| Johnson/Evinrude |
2 Cyl 3.187 Bore Looper |
60 |
2-Stroke |
1980-1985 |
| Johnson/Evinrude |
2 Cyl |
6 |
2-Stroke |
1985-1988 |
| Johnson/Evinrude |
2 Cyl |
8 |
2-Stroke |
1985-1988 |
| Johnson/Evinrude |
2 Cyl 4Stroke |
15 |
4-Stroke |
1995-2001 |
| Johnson/Evinrude |
2 Cyl 4Stroke |
9.9 |
4-Stroke |
1995-2001 |
| Johnson/Evinrude |
4 Cyl 3.600 Bore E-TEC |
115 |
E-TEC |
2007-2011 |
| Johnson/Evinrude |
4 Cyl 3.600 Bore E-TEC |
130 |
E-TEC |
2010-2011 |
| Johnson/Evinrude |
6 Cyl 3.500 Bore Cross Flow |
150 |
2-Stroke |
1978-1991 |
| Johnson/Evinrude |
6 Cyl 3.500 Bore Cross Flow |
155 |
2-Stroke |
1984-1992 |
| Johnson/Evinrude |
6 Cyl 3.500 Bore Cross Flow |
185 |
2-Stroke |
1984-1985 |
| Johnson/Evinrude |
6 Cyl 3.500 Bore Cross Flow |
200 |
2-Stroke |
1976-1983 |
| Johnson/Evinrude |
6 Cyl 3.500 Small Bore Cross Flow |
175 |
2-Stroke |
1978-1985 |
| Johnson/Evinrude |
6 Cyl 3.500 Small Bore Cross Flow |
235 |
2-Stroke |
1978-1979 |
| Johnson/Evinrude |
6 Cyl 3.600 Bore 60 Degree E-TEC |
200 |
E-TEC |
2007-2011 |
| Johnson/Evinrude |
6 Cyl 3.600 Bore E-TEC |
135 |
E-TEC |
2013-2014 |
| Johnson/Evinrude |
6 Cyl 3.600 Bore E-TEC |
150 |
E-TEC |
2007-2012 |
| Johnson/Evinrude |
6 Cyl 3.600 Bore E-TEC |
175 |
E-TEC |
2007-2011 |
| Johnson/Evinrude |
6 Cyl 3.625 Big Bore Cross Flow |
175 |
2-Stroke |
1987-1991 |
| Johnson/Evinrude |
6 Cyl 3.625 Bore Cross Flow |
235 |
2-Stroke |
1981-1985 |
| Johnson/Evinrude |
6 Cyl 3.854 Bore E-TEC 3.3 Liter |
200 |
E-TEC |
2005-2012 |
| Johnson/Evinrude |
6 Cyl 3.854 Bore E-TEC 3.3 Liter |
225 |
E-TEC |
2005-2012 |
| Johnson/Evinrude |
6 Cyl 3.854 Bore E-TEC 3.3 Liter |
250 |
E-TEC |
2005-2011 |
| Johnson/Evinrude |
6 Cyl 3.854 Bore E-TEC 3.4 Liter |
250 |
E-TEC |
2010 |
| Johnson/Evinrude |
6 Cyl 3.854 Bore E-TEC 3.4 Liter |
300 |
E-TEC |
2009-2012 |
| Mariner |
ALL |
ALL |
ALL |
ALL |
| Mercury |
3 Cyl 3.6255 Bore 1.5L Optimax |
75/90/115 |
Optimax |
2004-2014 |
| Mercury |
3 Cyl 3.6255 Bore 1.5L Optimax |
125 |
Optimax |
2006-2012 |
| Mercury |
3 Cyl 3.6255 Bore 1.5L Optimax |
80 |
Optimax |
2006-2014 |
| Mercury |
3 Cyl 3.6255 Bore Pro XS |
115 |
Pro XS |
2010-2015 |
| Mercury |
6 Cyl 2.5L XS |
200 |
2-Stroke |
2001-2006 |
| Mercury |
6 Cyl 3.501 Bore 2.5L Jet |
110 |
Optimax |
2006-2013 |
| Mercury |
6 Cyl 3.501 Bore 2.5L Optimax |
115 |
Optimax |
2000 |
| Mercury |
6 Cyl 3.501 Bore 2.5L Optimax |
135 |
Optimax |
1998-2012 |
| Mercury |
6 Cyl 3.501 Bore 2.5L Optimax |
150 |
Optimax |
1998-2014 |
| Mercury |
6 Cyl 3.501 Bore 2.5L Optimax |
175 |
Optimax |
2001-2014 |
| Mercury |
6 Cyl 3.625 Bore 3L |
225 |
2-Stroke |
1994-2001 |
| Mercury |
6 Cyl 3.625 Bore 3L EFI |
225 |
EFI |
1995-2001 |
| Mercury |
6 Cyl 3.625 Bore 3L EFI |
250 |
EFI |
1995-2001 |
| Mercury |
6 Cyl 3.625 Bore 3L Pro Max |
300 |
2-Stroke |
1998-2000 |
| Mercury |
6 Cyl 3.625 Bore 3L XB |
250 |
2-Stroke |
2000-2004 |
| Mercury |
6 Cyl 3.6265 Bore 2.5L Pro XS |
150 |
Pro XS |
2010-2018 |
| Mercury |
6 Cyl 3.6265 Bore 2.5L Pro XS |
175 |
Pro XS |
2008-2018 |
| Mercury |
6 Cyl 3.6265 Bore 3L Optimax |
200 |
Optimax |
1997 |
| Mercury |
6 Cyl 3L Carb Sea Pro |
225 |
2-Stroke |
1995-2001 |