Alternator V-Belt – Fits Yanmar 2GM, 3GM Series Diesel Engines (Replaces 25112-003601)
Alternator V-Belt – Fits Yanmar 2GM, 3GM Series Diesel Engines (Replaces 25112-003601) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Alternator V-Belt – Fits Yanmar 2GM, 3GM Series Diesel Engines (Rep...
Product Details
This high-quality Alternator V-Belt – Fits Yanmar 2GM, 3GM Series Diesel Engines (Replaces 25112-003601) is designed for reliable performance in Yanmar 2GM, 2GMF, 3GM, and 3GMF marine diesel engines. It functions as a durable aftermarket replacement for the alternator drive belt system, ensuring your engine's charging system operates efficiently.
This part is a direct replacement and cross-references with Yanmar OEM part numbers 25112-003601, 25112-003600, and 121150-42290.
- Installation Method: Installs as a direct replacement for the original belt.
- Durable Construction: Made from robust rubber materials to withstand the marine environment.
- Reference Marking: The equivalent genuine Yanmar belt often has Mitsuboshi REMF-6310 printed on it.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 25112-003601 |
| Yanmar | 25112-003600 |
| Yanmar | 121150-42290 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Stroke | OEM Part No. |
|---|---|---|---|
| Yanmar | 2GM | 4-Stroke | 25112-003601 |
| Yanmar | 2GMF | 4-Stroke | 25112-003601 |
| Yanmar | 3GM | 4-Stroke | 25112-003601 |
| Yanmar | 3GMF | 4-Stroke | 25112-003601 |
Technical Specs
- Product Type
- Alternator V-Belt
- Installation
- Direct replacement
- Belt Type
- V-Belt
- Material
- Rubber
- Color
- Black
- Warranty
- 1-year warranty against manufacturing defects under normal use conditions
What’s in the Box
- 1 x Alternator V-Belt (Replaces 25112-003601)
Installation Notes
- Ensure the engine is off and cool, and disconnect the battery terminals for safety.
- Locate the alternator and loosen its pivot and adjustment bolts to relieve tension on the old belt.
- Carefully slip the old, worn belt off the crankshaft, water pump, and alternator pulleys.
- Compare the new belt with the old one to confirm it is the correct size.
- Install the new V-belt, ensuring it is properly seated in the grooves of all pulleys.
- Apply tension by pulling the alternator away from the engine until the belt has about 1/2 inch (1.3 cm) of deflection when pressed firmly.
- Tighten the alternator's adjustment and pivot bolts securely.
- Reconnect the battery terminals and start the engine to test for proper operation and listen for any unusual noises.
Troubleshooting & FAQ
How do I know if this V-belt will fit my Yanmar engine?
This belt is a direct replacement for Yanmar 2GM, 2GMF, 3GM, and 3GMF series engines. To guarantee a perfect fit, please cross-reference your existing part number with those listed in our Part Number Matrix, such as 25112-003601, 25112-003600, or 121150-42290.
What are the signs of a failing alternator V-belt?
Common signs include loud squealing noises from the engine (especially on startup), visible cracks, glazing, or fraying on the belt material, and battery charging issues, which may trigger an alternator warning light on your dashboard.
How often should I replace my alternator belt?
While there is no fixed schedule, we recommend inspecting the belt during all routine engine service. Replace it every few years or immediately if you notice any signs of wear, damage, or stretching to prevent unexpected failure.
What is the difference between this belt and an OEM one?
This is a high-quality aftermarket part designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function. It delivers comparable performance and durability at a greater value.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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