Recmar MerCruiser Thermostat Cover Gasket 27-41812-2 18-2554
REC27-418122
- Dispatched in 2-3 days
- 30 Day Return Policy
- In stock, ready to ship
- Backordered, shipping soon
Recmar MerCruiser Thermostat Cover Gasket
Housing / Bypass Seal | Replaces 27-41812-2
Replacement gasket used between the thermostat cover and housing on selected MerCruiser GM-engine cooling systems. The correct application is determined by thermostat-housing design and parts reference, not by engine displacement alone.
Key Features
- Thermostat-cover/bypass gasket
- For housings that specify 27-41812-2
- Die-cut replacement profile
- Aftermarket Recmar component; not genuine Mercury
- One gasket supplied
Technical Specs
| Part type | Thermostat cover / bypass gasket |
| Installation location | Between specified cover and thermostat housing |
| Quantity | 1 gasket |
| Supply type | Aftermarket Recmar |
| 4Boats SKU | REC27-418122 |
Compatibility / Fitment Guide
| Engine / system | Application | Fitment condition |
|---|---|---|
| MerCruiser GM V6/V8 cooling systems | Two-bib and related thermostat housings using 27-41812-2 | Confirm reference in the exact housing diagram |
| MerCruiser high-performance GM V8 | Selected 420/425, 450, 465, 500/500 Bulldog and 525 applications | Model and serial-specific parts lookup required |
| Replacement housing service | Covers/housings listing Mercury 41812-2 | Match port shape and bolt pattern to removed gasket |
Not every MerCruiser thermostat housing uses this gasket. It does not replace the thermostat-to-manifold gasket, O-ring or other seals in the assembly. Do not reuse an old gasket after the cover has been removed.
Part Number Cross Reference
| Mercury / Quicksilver | 27-41812-2; 27-418122; 41812-2 |
| Sierra | 18-2554 |
| GLM | 31631 |
| Mallory | 9-60006 |
| Recmar / 4Boats SKU | REC27-418122 |
Cross-reference numbers identify compatible service applications; they do not make this aftermarket Recmar part a genuine OEM component.
Frequently Asked Questions
Is this the thermostat itself?
No. This listing is for one thermostat-cover/bypass gasket only.
Will it fit all GM V6/V8 MerCruisers?
No. The housing must specifically list 27-41812-2.
Can the old gasket be reused?
Replacement is recommended whenever the cover is removed to reduce leak risk.
Is it genuine Quicksilver?
No. It is an aftermarket Recmar replacement.
Before ordering: check the thermostat-housing exploded diagram for 27-41812-2 and compare the removed gasket profile.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
