Oil Pump Gasket – Fits Yanmar 3JH & 4JH Series Marine Diesel Engines (Replaces 129150-35042)
Oil Pump Gasket – Fits Yanmar 3JH & 4JH Series Marine Diesel Engines (Replaces 129150-35042) 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
Oil Pump Gasket – Fits Yanmar 3JH & 4JH Series Marine Diesel En...
Product Details
This high-quality aftermarket Oil Pump Gasket is engineered for a precise fit on a range of Yanmar 3JH and 4JH Series marine diesel engines. It provides a reliable, leak-proof seal, ensuring optimal performance and longevity for your engine's lubrication system.
It serves as a direct replacement for Yanmar OEM part number 129150-35042.
- Installs as a direct OEM-equivalent replacement.
- Made from premium, heat-resistant, non-asbestos material.
- Engineered to create a durable, leak-proof oil pump seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 129150-35042 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is compatible with the following Yanmar 3JH and 4JH series marine diesel engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yanmar | 3JH25A | 25 | 4-Stroke | 129150-35042 | ||
| Yanmar | 3JH40 | 40 | 4-Stroke | 129150-35042 | ||
| Yanmar | 3JH4E | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH-HTBE | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH-TE | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH110 | 110 | 4-Stroke | 129150-35042 | ||
| Yanmar | 4JH2 | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH3-DTE | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH3-HTE | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH3-TE | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH3E | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH4-DTE | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH45 | 45 | 4-Stroke | 129150-35042 | ||
| Yanmar | 4JH4AE | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH4E | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH57 | 57 | 4-Stroke | 129150-35042 | ||
| Yanmar | 4JH5E | 4-Stroke | 129150-35042 | |||
| Yanmar | 4JH80 | 80 | 4-Stroke | 129150-35042 |
Technical Specs
- Product Type
- Oil Pump Gasket
- Installation
- Direct OEM replacement
- Housing Material
- Premium heat-resistant material (non-asbestos)
- Dimensions
- 5.0" x 5.0" x 0.1"
- Other Technical Attributes
- Engineered for leak-proof oil pump seal
What’s in the Box
- 1 x Oil Pump Gasket (Replaces 129150-35042)
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Drain the engine oil completely into a suitable container.
- Remove any components obstructing access to the oil pump assembly.
- Carefully unbolt and remove the oil pump from the engine block.
- Remove the old gasket. Thoroughly clean both the engine and pump mating surfaces, ensuring they are free of old debris, oil, and sealant.
- Position the new gasket correctly on the oil pump or engine block.
- Reinstall the oil pump, ensuring it is properly aligned. Tighten bolts in a crisscross pattern to the manufacturer's recommended torque specifications.
- Reassemble any components that were removed.
- Refill the engine with the correct grade and amount of fresh oil.
- Reconnect the battery, start the engine, and carefully inspect for any oil leaks around the pump housing.
Troubleshooting & FAQ
How do I confirm this gasket fits my specific Yanmar engine?
This gasket is designed for Yanmar's 3JH and 4JH series engines. The most reliable method is to check our Engine & Model Compatibility table to see if your model is listed. Always cross-reference the OEM part number (129150-35042) with your engine's service manual to ensure an exact match.
What are the common signs of a failing oil pump gasket?
The most common symptom is a visible oil leak originating from the seam where the oil pump meets the engine block. Other signs can include a gradual drop in engine oil levels, unexplained low oil pressure warnings, or oil residue on surrounding engine components.
_Should I use sealant or gasket adhesive with this part?
In most cases, this gasket is designed to be installed dry on clean, flat surfaces. However, always refer to your engine's specific service manual. Some applications or slightly imperfect surfaces might call for a very thin layer of an appropriate oil-resistant sealant.
The oil pump gasket is not a routine replacement item. It should be replaced anytime the oil pump is removed for service, or immediately if you detect a leak in that area. 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. We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available. 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.When should this gasket be replaced?
OEM vs. Aftermarket?
Shipping speed & cost
Warranty & returns
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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