Description
The Yanmar 129671-42280 is a genuine OEM alternator V-belt for Yanmar 4JH4 series marine diesel engines (roughly 75 to 110 HP).
Why it matters
The V-belt drives the engine accessories, and on many installations the seawater pump, so losing it can mean losing engine cooling. Carry a spare.
Supersession
This part replaces the earlier 129671-42280E. If your manual or a previous invoice lists that, this is the current replacement.
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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