Recmar Yanmar 4BY 6BY Seawater Pump Belt 4PK964 120650-42360
REC120650-42360
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Regular price£31.73
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Yanmar BY-Series Seawater Pump Belt
4PK964 | 120650-42360
Aftermarket Recmar 4PK964 multi-rib belt for the seawater-pump drive on specified Yanmar BY-series marine diesels.
VERIFY BEFORE ORDERING: This is not an alternator belt. Yanmar catalogues 120650-42360 as the seawater-pump V-belt on the verified BY models.
Key Features
- Seawater-pump drive belt
- 4PK964 multi-rib specification
- Selected Yanmar 4BY and 6BY marine diesels
- Aftermarket Recmar replacement
- One belt supplied
Technical Specs
| Function | Seawater-pump drive |
| Belt profile / length | 4PK964 |
| Engine family | Yanmar BY series |
| Supply | 1 belt |
| 4Boats SKU | REC120650-42360 |
Compatibility / Fitment Guide
| Application | Verified fitment | Limits / checks |
|---|---|---|
| Yanmar 4BY / 4BY2 / 4BY3 | 150 and 180hp variants, including Z-drive versions where catalogued | Confirm complete model suffix. |
| Yanmar 6BY / 6BY2 / 6BY3 | 220 and 260hp variants, including Z versions | Verify the seawater-pump diagram. |
| Yanmar 6BY3-160 | Catalogued application in selected parts listings | Use engine serial/OEM reference for final confirmation. |
Final fitment check: Match 120650-42360 and 4PK964 in the seawater-pump assembly. Do not substitute for the alternator belt.
Part Number Cross Reference
| Yanmar | 120650-42360 |
| Belt specification | 4PK964 |
| Recmar / 4Boats | REC120650-42360 |
Frequently Asked Questions
Is this the alternator belt?
No. It is the seawater-pump drive belt.
Does it fit every BY engine?
Only the listed applications with matching part number are verified.
Is it genuine Yanmar?
No. It is aftermarket Recmar.
Check seawater-pump bearings and pulley alignment before installing the new belt.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
