Recmar MerCruiser MCM 470 3.7L Thermostat Housing Gasket 27-74830
REC27-74830
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Recmar MerCruiser 470 Thermostat Housing Gasket
3.7L Inline-Four | Replaces 27-74830
Replacement gasket sealing the thermostat housing to the coolant reservoir on specified MerCruiser MCM/MIE 470-series 3.7L inline-four engines.
Key Features
- Thermostat housing-to-reservoir gasket
- For specified MCM/MIE 470 3.7L engines
- Application-specific 74830 profile
- Aftermarket Recmar; not genuine Mercury
- One gasket supplied
Technical Specs
| Part type | Housing-to-reservoir gasket |
| Engine family | MerCruiser 470 / 3.7L inline-four |
| Typical era | 1976–1982 where specified |
| Quantity | 1 gasket |
| 4Boats SKU | REC27-74830 |
Compatibility / Fitment Guide
| Engine / system | Application | Required check |
|---|---|---|
| MerCruiser MCM 470 | 3.7L inline-four closed-cooling engine | Common 1976–1982 application; confirm serial |
| MerCruiser MIE 470 | 3.7L inline-four inboard variant | Housing diagram must list 27-74830 |
| Cooling reservoir service | Thermostat housing-to-reservoir joint | Compare passage and bolt-hole layout |
Not for GM V6/V8, Ford V8 or later MerCruiser 3.0L petrol engines. It is not the thermostat-cover gasket or cylinder-head gasket.
Part Number Cross Reference
| Mercury / MerCruiser | 27-74830; 74830 |
| Sierra | 18-2843 |
| Barr Marine | MC47-27-74830 |
| Recmar / 4Boats SKU | REC27-74830 |
Cross-reference numbers identify the gasket profile and service application. This is an aftermarket Recmar component.
Frequently Asked Questions
Will it fit a MerCruiser 3.0L?
No. This listing is for the 470-series 3.7L housing/reservoir joint.
Where is it installed?
Between the thermostat housing and coolant reservoir.
What is included?
One gasket only.
Should sealant be used?
Follow the MerCruiser workshop procedure for the exact engine and gasket material.
Before ordering: confirm MCM/MIE 470 3.7L and OEM gasket 27-74830.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
