Johnson Evinrude Thermostat Cover Seal 336947 5-15HP 1991-2007
REC336947
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Thermostat Cover Seal 336947
Johnson / Evinrude Small Two‑Stroke Outboards
Aftermarket thermostat-cover seal for selected Johnson and Evinrude small two-stroke outboards. This shaped seal/O-ring sits at the thermostat-cover joint and should be replaced whenever the old seal is hardened, flattened or damaged.
Key Features
- ✔ Thermostat-cover sealing ring
- ✔ Aftermarket replacement for OMC/BRP 336947
- ✔ For selected 5–15 HP two-strokes
- ✔ Helps prevent cooling-water leakage at the cover
- ✔ One seal supplied
Technical Specs
| Part type | Thermostat-cover seal / O-ring |
| Primary reference | 336947 / 0336947 |
| Engine system | Cooling / thermostat housing |
| Quantity | One seal |
| 4Boats SKU | REC336947 |
Compatibility / Fitment Guide
| Engine rating | Verified model-year coverage | Notes |
|---|---|---|
| 5 HP | 1996–1998 | Selected Johnson/Evinrude models using seal 336947. |
| 6 HP | 1991–2005 | Confirm the thermostat-cover diagram. |
| 8 HP | 1991–2005 | Confirm the thermostat-cover diagram. |
| 9.9 / 10 HP | 1993–2007 | Some catalogues label the family as 10 HP; verify model code. |
| 15 HP | 1993–2007 | For models specifying 336947 at the thermostat cover. |
Not every engine within a horsepower range uses the same thermostat housing. Inspect the cover groove and confirm the OEM number before dismantling.
Part Number Cross Reference
| OMC / BRP | 0336947; 336947 |
| BRP service-pack reference | 0766474 / 766474 (where catalogued) |
| Recmar / 4Boats SKU | REC336947 |
Cross-reference numbers identify the intended application; brand and packaging may differ.
Frequently Asked Questions
Is this a flat paper gasket?
No. It is listed as a thermostat-cover seal/O-ring.
Does it fit all 9.9/15 HP engines?
No. The engine must specify 336947; older and later designs can use different seals.
Should I reuse the old seal?
Replacement is recommended if it is compressed, cracked or hardened.
Is thermostat included?
No. This listing is for the cover seal only.
Compare the engine model code, original part number and physical installation before ordering.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
