Recmar MerCruiser V6 V8 Thermostat Retaining Sleeve 23-806922
REC23-806922
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MerCruiser Thermostat Retaining Sleeve
Replaces 23-806922 | Design No. 2 & No. 3 Housings
Aftermarket retaining sleeve used inside compatible MerCruiser V6 and V8 thermostat housings. The sleeve locates and retains the thermostat; it does not regulate temperature and is not a complete thermostat kit.
Key Features
- Thermostat retaining sleeve, not a thermostat
- For compatible MerCruiser V6/V8 housings
- Design No. 2 and No. 3 application family
- Replaces obsolete 23-806922 family references
- Aftermarket Recmar replacement
Technical Specs
| Part type | Thermostat housing retaining sleeve |
| Engine family | MerCruiser petrol V6/V8 |
| Housing identification | Design No. 2 / Design No. 3 |
| Thermostat included | No |
| 4Boats SKU | REC23-806922 |
Compatibility / Fitment Guide
| Engine / system | Verified application | Fitment notes |
|---|---|---|
| MerCruiser GM V6 | Compatible V6 thermostat housings using retaining sleeve 23-806922 / 23-174951 | Confirm by housing design and the number/shape of the removed sleeve. |
| MerCruiser GM V8 | Compatible small- and big-block V8 housings using the same sleeve reference | Not every V8 housing uses this retainer; inspect the parts diagram. |
| Exclusions | Design No. 1 housings; housings using a different retainer; outboard thermostats | Do not substitute based only on a similar outside diameter. |
Do not order by engine capacity alone. Match the complete Volvo Penta/MerCruiser model suffix, cooling-system type and original part number in the engine parts catalogue.
Part Number Cross Reference
| Mercury / MerCruiser | 23-806922 |
| Earlier / related Mercury references | 23-174951; 23-17495 |
| Current supersession | Check current Mercury catalogue; later service references may supersede 806922 |
| 4Boats / Recmar SKU | REC23-806922 |
Cross-reference numbers indicate the application family; this item is a Recmar aftermarket replacement, not a genuine Volvo Penta, OMC or Mercury/Quicksilver part.
Frequently Asked Questions
Does this sleeve include the thermostat?
No. It is the internal retaining sleeve only.
Which engines use it?
Selected MerCruiser GM V6 and V8 engines with Design No. 2 or No. 3 thermostat housings.
Can I identify fitment by engine year?
Not reliably. Use the engine serial number and thermostat-housing diagram.
Installation note: Allow the engine to cool, inspect the housing and sealing surfaces, and pressure-test/check for leaks after installation. Professional installation is recommended.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
