Description
The Yanmar 129671-77680 is a genuine OEM 6-rib serpentine alternator belt for Yanmar 4JH4 and JH5 series marine diesel engines.
Why it matters
On these engines the belt drives the accessories, and often the seawater pump, so a failed belt can mean lost engine cooling. It is one of the most important spares to carry aboard.
Fitting
This belt drives the alternator and often the seawater pump, so carry a spare. Inspect it at every service for cracking, glazing and rib dust around the pulleys.
Check your fitment
The engine models listed in the product specifications are a guide only. Always confirm against the parts catalogue for your engine’s model and serial number before ordering. If you are unsure, send us your engine plate details and we will check it for you.
Genuine Yanmar parts
We stock genuine Yanmar OEM parts, not pattern copies. If you need help identifying the right part for your engine, or want to book a service, get in touch.
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