Valve Cover Gasket – Fits Yanmar 4JH Series Marine Engines (Replaces 129601-11310)
Valve Cover Gasket – Fits Yanmar 4JH Series Marine Engines (Replaces 129601-11310) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Valve Cover Gasket – Fits Yanmar 4JH Series Marine Engines (Replace...
Product Details
This high-quality Valve Cover Gasket – Fits Yanmar 4JH Series Marine Engines (Replaces 129601-11310) is engineered for a precise seal on Yanmar 4-cylinder marine diesel engines, including the 4JH3, 4JH4, and 4JH5 series with bore sizes from 84-88mm (3.30-3.46in).
It serves as a direct replacement for Yanmar part number 129601-11310, ensuring reliable performance and compatibility.
- Engineered for direct-fit installation.
- Designed for use in diesel fuel environments.
- Constructed from durable, high-quality gasket material.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 129601-11310 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is documented to fit the following Yanmar marine and industrial engines. Please verify your specific model and part number before ordering.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yanmar | 4JH4AE | 4-Stroke | 129601-11310 | |
| Yanmar | 4JH4E | 4-Stroke | 129601-11310 | |
| Yanmar | 4JH5E | 4-Stroke | 129601-11310 | |
| Yanmar | 4JH3 | 4-Stroke | 129601-11310 | Also listed as fitting 4TNV84 industrial engines |
| Yanmar | 4TNV88 | 4-Stroke | 129601-11310 | Industrial engine equivalents: DSA, GGEP, GYM, LU2, NBK, XWL, DSAP |
Technical Specs
- Product Type
- Valve Cover Gasket
- Installation
- Direct fit
- Fuel Type
- Diesel
- Housing Material
- Engineered gasket material
- Dimensions
- 39.5 cm L x 15.5 cm W x 0.2 cm H
- Warranty
- Varies by seller (6-month warranty from Diesel Parts Direct)
- Other Attributes
- Fits 4-cylinder valve covers
What’s in the Box
- 1 x Valve Cover Gasket (129601-11310)
Installation Notes
- Ensure the engine is cool and disconnect the battery for safety.
- Thoroughly clean the area around the valve cover to prevent debris from entering the engine.
- Carefully remove the bolts and old valve cover gasket. Note the position of any brackets or clips.
- Clean both the valve cover and cylinder head mating surfaces completely. All old gasket material and sealant must be removed.
- Place the new gasket into the groove on the valve cover. Ensure it is seated correctly and evenly.
- Reinstall the valve cover and tighten the bolts in the sequence and to the torque specifications recommended by the manufacturer.
- Reconnect the battery, start the engine, and carefully inspect for any oil leaks around the gasket.
Troubleshooting & FAQ
How do I know if this gasket fits my engine?
This gasket is designed for Yanmar 4JH series marine engines (4JH3, 4JH4, 4JH5) and some 4TNV industrial engines. The best way to confirm fitment is to match your existing part number to the replacement number, 129601-11310. Also, visually compare your old gasket to the images provided.
What are the signs of a failing valve cover gasket?
Common signs include visible oil leaks around the top of the engine, a burning oil smell as it drips onto hot exhaust components, a dirty or oil-covered valve cover, and potentially low engine oil levels over time.
Is this gasket also for industrial engines?
Yes, some sources indicate this gasket fits both the marine 4JH series and the industrial 4TNV series engines (like the 4TNV84 and 4TNV88). Check the compatibility table and your specific part number to be certain.
What is the recommended replacement interval?
There is no fixed replacement interval for a valve cover gasket. It should be replaced whenever it shows signs of leaking, or when the valve cover is removed for other service, such as a valve adjustment.
Do I need to use sealant with this gasket?
Most modern gaskets like this one are designed to be installed dry. However, it's best practice to consult your engine's service manual. Sometimes a small amount of sealant is required at sharp corners or joints, but never apply it over the entire gasket surface unless specified.
Is this an OEM or aftermarket part?
This is a high-quality aftermarket replacement part, not an OEM component. It is engineered to meet or exceed original equipment specifications and is manufactured in an ISO 9002 certified facility to ensure quality and performance.
How much is shipping and how fast is it?
We offer fast worldwide shipping, with most orders arriving in 5–15 days. Standard shipping is free for most regions. Expedited options are available at checkout if your location qualifies.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. Should you encounter an issue, please contact our support team with your order details. Returns are accepted for unused items in their original packaging within our standard return window.
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.
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