Rocker Cover Gasket – Fits Yanmar 3TNV76, 3YM30, 3YM30AE Engines (Replaces 119717-11331)
Rocker Cover Gasket – Fits Yanmar 3TNV76, 3YM30, 3YM30AE Engines (Replaces 119717-11331) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Rocker Cover Gasket – Fits Yanmar 3TNV76, 3YM30, 3YM30AE Engines (R...
Product Details
This high-quality Rocker Cover Gasket ensures a precise, leak-free seal for the valve cover on compatible Yanmar engines. It is designed to fit Yanmar marine models 3YM30 and 3YM30AE, as well as the industrial 3TNV76 engine, providing reliable performance in demanding environments.
This part is a direct replacement for Yanmar OEM part number 119717-11331.
- Installation Method: Direct replacement
- Intended Fuel Type: Diesel
- Warranty: 1-year aftermarket warranty
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 119717-11331 |
| Yanmar | 11971711331 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is designed for specific Yanmar marine and industrial diesel engines. Please verify your model is listed before ordering.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yanmar | 3TNV76 | 119717-11331 | Industrial Engine | |||
| Yanmar | 3YM30 | 119717-11331 | Marine Engine | |||
| Yanmar | 3YM30AE | 119717-11331 | Marine Engine |
Technical Specs
- Product Type
- Rocker Cover Gasket / Bonnet Cover Gasket
- Installation
- Direct replacement
- Fuel Type
- Diesel
- Dimensions
- 24.3" L x 15.0" W x 0.1" H
- Warranty
- 1 year (aftermarket)
What’s in the Box
- 1 x Rocker Cover Gasket (119717-11331)
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Clean any dirt and debris from the valve cover area to prevent contamination.
- Carefully remove any components obstructing access to the valve cover.
- Unscrew the valve cover retaining bolts and gently remove the cover.
- Remove the old gasket and thoroughly clean both the engine head and valve cover mating surfaces. Ensure they are dry and free of oil or old gasket material.
- Place the new gasket into the groove on the valve cover.
- Reinstall the valve cover and hand-tighten the bolts.
- Tighten the bolts in the manufacturer-specified sequence and to the correct torque value to ensure an even seal. Do not overtighten.
- Reconnect the battery and check for leaks after starting the engine.
Troubleshooting & FAQ
What are the signs of a failing rocker cover gasket?
Common symptoms include visible oil leaks around the top of the engine, a smell of burning oil, a dirty or oil-stained valve cover, and a lower-than-normal engine oil level. You may notice smoke from the engine bay if oil drips onto hot exhaust components.
Is this a direct replacement for Yanmar part 119717-11331?
Yes, this is an aftermarket part designed to be a direct, dimensionally-correct replacement for the OEM Yanmar part 119717-11331.
Do I need to use sealant or adhesive with this gasket?
Generally, this gasket is designed to create a seal on its own when installed correctly on clean, flat surfaces. However, consult your engine's official service manual, as some applications recommend a small amount of RTV sealant at corners or sharp bends.
What is the recommended torque for the valve cover bolts?
Torque specifications are specific to your engine model. It is critical to consult the Yanmar service manual for your specific engine (3TNV76, 3YM30, or 3YM30AE) to ensure proper torque values and tightening sequence. Overtightening can damage the gasket and cover, while under-tightening can cause leaks.
What’s the difference between a Rocker Cover and Bonnet Cover Gasket?
These terms are often used interchangeably. "Rocker Cover" is more common in the US, while "Bonnet Cover" may be used in other regions or by different manufacturers. Both refer to the seal for the valve cover at the top of the engine.
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.
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