Marine Replacement Belt for Yanmar 1GM, 1GM10 & 1GM10C — Replaces 128170-77350E / 128170-77350
Marine Replacement Belt for Yanmar 1GM, 1GM10 & 1GM10C — Replaces 128170-77350E / 128170-77350 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Marine Replacement Belt for Yanmar 1GM, 1GM10 & 1GM10C — Replac...
Marine Replacement Belt for Yanmar 1GM, 1GM10 & 1GM10C — Replaces 128170-77350E / 128170-77350 is backordered and will ship as soon as it is back in stock.
Product Details
This replacement marine belt is designed for Yanmar Marine diesel engines in the 1GM, 1GM10 and 1GM10C model families. It replaces the following Yanmar reference numbers: 128170-77350E and 128170-77350.
Use the model and original belt reference to confirm that this replacement matches your engine before ordering. The product is supplied as a single replacement belt, not as a multi-part kit.
- Replacement marine belt for selected Yanmar inboard diesel engines.
- Applicable to Yanmar 1GM, 1GM10 and 1GM10C models.
- Replaces Yanmar part numbers 128170-77350E and 128170-77350.
- Supplied as one individual belt.
Part Number Matrix
Use the reference numbers below to compare the replacement with the belt currently installed on your engine.
| Brand | Part Number |
|---|---|
| Yanmar | 128170-77350E |
| Yanmar | 128170-77350 |
Engine & Model Compatibility
This belt is listed for the following Yanmar Marine diesel engine models. Keep the engine model, stroke configuration and original belt reference together when checking fitment.
| Brand | Engine Model | Engine Type | Replacement References |
|---|---|---|---|
| Yanmar Marine | 1GM | Marine diesel | 128170-77350E; 128170-77350 |
| Yanmar Marine | 1GM10 | Marine diesel | 128170-77350E; 128170-77350 |
| Yanmar Marine | 1GM10C | Marine diesel | 128170-77350E; 128170-77350 |
Fitment data for other 1GM-family variants, production years, serial-number ranges or alternative belt sizes is not included in the product record. Verify the original belt reference and physical match before purchase if your engine designation differs from the models listed above.
Technical Specs
- Product Type
- Marine replacement belt
- Application
- Yanmar Marine diesel inboard engines
- Compatible Models
- 1GM, 1GM10 and 1GM10C
- Replacement References
- Yanmar 128170-77350E and 128170-77350
- Product Format
- Single belt; not a kit
- Brand Application
- Yanmar Marine Inboard
What’s in the Box
- 1 x Marine replacement belt
Installation Notes
- Switch off the engine and allow all components to cool before starting work.
- Disconnect the battery or main electrical supply where appropriate.
- Remove any guards or covers needed to access the belt.
- Release the belt tension according to the engine manufacturer’s procedure and remove the old belt.
- Inspect the pulleys and related drive components for wear, damage or contamination.
- Fit the replacement belt, making sure it is correctly seated in every pulley groove.
- Adjust the belt tension according to the Yanmar service instructions for your specific engine.
- Reinstall guards, reconnect the battery or electrical supply, and run the engine briefly to confirm correct tracking and operation.
Troubleshooting & FAQ
Which Yanmar engines are listed for this belt?
This replacement belt is listed for Yanmar Marine diesel models 1GM, 1GM10 and 1GM10C.
Which part numbers does this belt replace?
The listed replacement references are Yanmar 128170-77350E and 128170-77350.
Is this product a kit?
No. This is a single replacement belt and does not include additional tools, pulleys, fasteners or other engine components.
How can I confirm fitment before ordering?
Check the complete engine model and compare the reference number printed on or specified for your original belt. If your model is not 1GM, 1GM10 or 1GM10C, or if the original reference differs, confirm compatibility with a qualified marine technician before ordering.
What should I inspect before installing the new belt?
Inspect the pulley grooves, belt alignment and tensioning hardware. Correct any damaged or misaligned components before operating the engine.
Is this an OEM Yanmar belt?
This listing is for a replacement belt. The listed Yanmar numbers are reference numbers used to identify the application; the product should not be treated as a genuine Yanmar-branded component unless explicitly stated otherwise.
Can I install it myself?
Belt replacement may be suitable for an experienced boat owner, but installation must follow the service procedure for the specific engine. If you are unsure about belt routing or tension, use a qualified marine technician.
Safety & Important Info
- Confirm the engine model and original belt reference before ordering.
- Do not operate the engine with a loose, damaged or incorrectly aligned belt.
- Disconnect power and keep hands, clothing and tools clear of moving components during installation and testing.
- Follow the applicable Yanmar service instructions for belt tension and inspection.
About Sea Sierra
- Marine Parts Support — We supply replacement components for marine maintenance and repair applications.
- Fitment-Focused Listings — Check the listed model and reference numbers before ordering.
- Practical Replacement Solutions — Replacement parts are selected for common marine service requirements.
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