Customer Service: info@jlm-marine.com
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Most new, unused items may be returned within 7 days of delivery, subject to our Returns Policy. A 20% processing/restocking fee may apply for returns that are not the result of our error. Original shipping charges are non-refundable.
If the return is due to our mistake (incorrect or defective item), we will cover the return shipping cost and issue a full refund.
EU customers are entitled to a 14-day cooling-off period in accordance with applicable consumer protection regulations. Certain exclusions may apply.
Refunds are issued after the returned item is received and inspected. Processing times may vary depending on shipping transit and payment provider handling, but most refunds are completed promptly.
To request a return, please contact us at info@jlm-marine.com with your order number for return authorization. For full terms, conditions, and exclusions, please refer to our complete Returns & Refunds Policy page.
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.
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 |
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 |
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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