Aftermarket MerCruiser Thermostat Housing Gasket 27-33918 18-2917
REC27-33918
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MerCruiser Thermostat Gasket
Aftermarket Replacement | 27-33918
This Recmar aftermarket moulded gasket seals the thermostat housing on selected Mercury MerCruiser engines. It cross-references several Mercury, OMC, Sierra and Mallory numbers and is intended for routine cooling-system service where the original gasket specification matches.
Key Features
- ✔ Aftermarket Recmar: Replacement gasket for compatible MerCruiser applications.
- ✔ Moulded Construction: Designed to seal the thermostat housing joint.
- ✔ Cooling-System Service: Suitable for maintenance and repair work.
- ✔ Wide Cross-Reference: Matches listed Mercury, OMC, Sierra and Mallory numbers.
Technical Specs
| Brand | Recmar |
| SKU | REC27-33918 |
| Part Type | Thermostat Housing Gasket |
| Material | Moulded Rubber |
| Application | Selected MerCruiser / OMC |
| Supply Type | Aftermarket |
Compatibility / Fitment Guide
| Make | Model/Application | Notes |
|---|---|---|
| MerCruiser | 200/5.0L, 230/5.0LX and 260/5.7L | Serial 0B525982-0F600999 where listed. |
| MerCruiser | 262 Mag Alpha & Bravo | Serial 0F803800-0K999999 where listed. |
| MerCruiser | Selected 4.3L, 5.0L, 5.7L, 7.4L and 8.2L | Confirm housing and original gasket reference. |
OEM Cross Reference
| Mercury / MerCruiser | 27-33918, 27-53045-1 |
| Johnson / Evinrude / OMC | 3701777, 312797 |
| Sierra Marine | 18-2917, 18-2917-9 |
| Mallory Marine | 9-60007 |
| Recmar / 4Boats | REC27-33918 |
Questions & Answers
Is this a genuine MerCruiser gasket?
No. It is a Recmar aftermarket replacement.
Will it fit every MerCruiser V6 or V8?
No. Verify the engine serial range, housing design and original part number.
Is sealant required?
Follow the applicable service manual; do not add sealant unless specified by the manufacturer.
What is supplied?
One thermostat housing gasket is included.
Note: Drain or isolate the cooling system as required, clean the mating faces carefully and check for leaks after reassembly.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
