Yanmar Alternator V-Belt 2YM15 3YM20 3YM30 129612-42290E Marine Diesel Engine
RM129612-42290E
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Yanmar Alternator Belt 129612-42290E
Premium Replacement for 2YM & 3YM Series Marine Engines
This premium quality alternator V-belt is engineered to provide reliable drive performance for Yanmar marine diesel engines. Featuring a cogged profile for superior heat dissipation and flexibility, it is designed to meet the rigorous demands of marine environments, ensuring your charging system operates at peak efficiency.
Key Features
- ✔ Direct fit for Yanmar 2YM/3YM series
- ✔ Cogged V-profile for better grip
- ✔ Oil and heat resistant construction
- ✔ Precision matched to OEM specifications
Technical Specs
| Belt Type: | Cogged V-Belt |
| Width: | 13 mm |
| Length: | ~925 mm (Li) / 975 mm (La) |
| Material: | Fiber-Reinforced Rubber |
Compatibility / Fitment Guide
| Engine Model | Application | Fitment Notes |
|---|---|---|
| Yanmar 2YM15 | Alternator Drive | S/N E01733 up to E20847 |
| Yanmar 3YM20 | Alternator Drive | S/N E01733 up to E20847 |
| Yanmar 3YM30 | Alternator Drive | S/N E00305 up to E20847 |
| HITACHI Alternators | 60A & 80A Models | Where V-pulley is fitted |
OEM Cross Reference
| Yanmar | 129612-42290E, 129612-42290, 119831-42290E |
| Recmar | RM129612-42290E, REC129612-42290E |
| Bando | RPF 3375, 13X925Li |
Questions & Answers
Is this a genuine original part?
This is a premium quality aftermarket replacement part, manufactured by Recmar or equivalent to meet or exceed original equipment (OE) standards for fitment and performance.
How do I know if it is compatible with my engine serial number?
This belt fits Yanmar YM engines built after June 2004 with a serial number below E20848. If your serial number is E20848 or higher, your engine likely uses a flat serpentine belt (128790-77580) instead of this V-belt.
Why is the belt cogged (toothed)?
The cogged design allows the belt to bend more easily around small pulleys, reducing internal heat buildup and providing a better grip to prevent slipping under high alternator loads.
Note: Please verify your original part number and engine serial number against the references above before purchasing at 4boats.co.uk.
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