Alternator Belt for Yanmar 4JH4-TE and 4JH4-HTE (Replaces 129671-42280E, 129671-42280)
Alternator Belt for Yanmar 4JH4-TE and 4JH4-HTE (Replaces 129671-42280E, 129671-42280) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Alternator Belt for Yanmar 4JH4-TE and 4JH4-HTE (Replaces 129671-42...
Alternator Belt for Yanmar 4JH4-TE and 4JH4-HTE (Replaces 129671-42280E, 129671-42280) is backordered and will ship as soon as it is back in stock.
Product Details
This replacement alternator belt is intended for Yanmar 4JH4-TE and 4JH4-HTE marine inboard diesel engines. It transfers power from the engine crankshaft pulley to the alternator, helping maintain reliable operation of the engine charging system.
The belt replaces Yanmar references 129671-42280E and 129671-42280. Confirm the complete engine model and the part number from your existing belt or service documentation before ordering.
- Application-specific alternator belt for Yanmar 4JH4-TE and 4JH4-HTE engines.
- Designed for the belt-drive environment of marine inboard diesel engines.
- Sold as one replacement belt.
Part Number Matrix
Use the following references to compare the replacement belt with your existing part and engine documentation.
| Brand | Part Number | Reference |
|---|---|---|
| Yanmar | 129671-42280E | OEM reference |
| Yanmar | 129671-42280 | Additional Yanmar reference |
Engine & Model Compatibility
The company fitment record identifies this alternator belt for the following Yanmar marine inboard engine models. Fitment is limited to the listed model designations; verify the engine nameplate and belt reference before installation.
| Brand | Model | Application | OEM Reference | Fitment Notes |
|---|---|---|---|---|
| Yanmar Marine | 4JH4-TE | Alternator belt | 129671-42280E | Confirm the engine model and belt reference before ordering. |
| Yanmar Marine | 4JH4-HTE | Alternator belt | 129671-42280E | Confirm the engine model and belt reference before ordering. |
Technical Specs
- Product Type
- Alternator belt
- Application
- Yanmar marine inboard diesel engines
- Compatible Engine Models
- Yanmar 4JH4-TE and 4JH4-HTE
- Replacement References
- 129671-42280E and 129671-42280
- Installation
- Engine-specific; follow the applicable Yanmar service procedure
What’s in the Box
- 1 x Alternator belt
Installation Notes
- Stop the engine, allow it to cool, and disconnect the battery according to the engine service procedure.
- Locate the alternator belt and loosen the alternator mounting and adjustment hardware as required.
- Remove the existing belt from the alternator and crankshaft pulleys.
- Inspect the pulleys for wear, damage, contamination, and alignment before fitting the replacement belt.
- Install the new belt, ensuring it is fully seated in the pulley grooves.
- Adjust belt tension according to the applicable Yanmar service manual. Do not rely on a generic tension value when a model-specific specification is available.
- Tighten the alternator mounting and adjustment hardware securely.
- Reconnect the battery, start the engine, and check belt tracking, charging-system operation, and unusual noise.
Troubleshooting & FAQ
How do I confirm that this belt fits my engine?
Confirm that your engine is a Yanmar 4JH4-TE or 4JH4-HTE and compare the existing belt or service documentation with Yanmar reference 129671-42280E or 129671-42280. If the model designation or reference differs, consult a Yanmar dealer or qualified marine technician before ordering.
What are common signs of a worn alternator belt?
Cracking, fraying, glazing, excessive looseness, belt dust, squealing, or visible misalignment may indicate belt wear or an adjustment problem. A charging warning or low charging voltage can also occur when the alternator belt slips, but the charging system should be diagnosed separately.
How often should the belt be replaced?
Replacement timing depends on engine hours, service conditions, belt condition, and the maintenance schedule for your engine. Inspect the belt during routine service and replace it if it shows wear, damage, contamination, or loss of correct tension.
Does this product include an alternator or pulley?
No. This listing is for one alternator belt only. The alternator, pulleys, mounting hardware, and other engine components are not included.
Is this a Yanmar-branded OEM belt?
The listed product is a replacement alternator belt identified for Yanmar applications. The product record references Yanmar part numbers 129671-42280E and 129671-42280; confirm the packaging and manufacturer details supplied with your order if genuine Yanmar branding is required.
Safety & Important Info
- Verify the complete engine model and replacement reference before purchase.
- Do not work near a running engine or rotating belt drive.
- Disconnect the battery and follow the applicable service-manual safety procedures before installation.
- Incorrect belt tension or pulley misalignment can damage the belt and charging-system components.
- Professional installation is recommended when the correct belt tension or engine procedure is uncertain.
About Sea Sierra
- Marine-Focused Parts — We supply replacement components for marine engine maintenance and repair.
- Application-Based Cataloging — Product fitment information is organized around engine models and manufacturer references.
- Support for Correct Identification — Compare the engine model and existing part reference before ordering to help ensure the correct replacement.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
