Recmar Yanmar 4BY 6BY Thermostat 165000-69950
REC165000-69950
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Yanmar 4BY / 6BY Thermostat
Replaces 165000-69950
Aftermarket coolant thermostat for Yanmar 4BY and 6BY marine diesel engines using reference 165000-69950.
Key Features
- For Yanmar 4BY and 6BY marine diesels
- Direct part-number replacement
- Coolant temperature control component
- Replaces 165000-69950
- Recmar aftermarket thermostat
Technical Specs
| Part type | Coolant thermostat |
| Engine families | Yanmar 4BY / 6BY |
| Opening temperature | Verify against engine service data / removed thermostat |
| OEM reference | 165000-69950 |
| SKU | REC165000-69950 |
Compatibility / Fitment Guide
| Engine family | Verified models | Notes |
|---|---|---|
| Yanmar 4BY | Applicable 4BY variants whose parts book lists 165000-69950 | Confirm full suffix and serial. |
| Yanmar 6BY | Applicable 6BY variants using the same reference | Do not confuse with 6LY thermostat families. |
| Exclusion | 6LY / 6LY2 / 6LY3 | These use 119593-49550 or 127605-48590 families. |
Confirm the complete model suffix, serial number, temperature specification and OEM reference.
Part Number Cross Reference
| Yanmar | 165000-69950 |
| 4Boats SKU | REC165000-69950 |
Recmar aftermarket replacement; Yanmar references identify fitment only.
Frequently Asked Questions
What temperature does it open at?
Verify the value stamped on the original thermostat or in the serial-specific Yanmar manual; it is not safely inferred here.
Does it fit 6LY engines?
No. The verified family is 4BY/6BY.
Is it genuine Yanmar?
No. It is a Recmar aftermarket replacement.
Installation note: Fit the specified new gasket/seal, bleed the cooling circuit where required and check operating temperature.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
