Intake Manifold Gasket – Fits Yanmar 3JH Series Marine Diesel Engines (Replaces 129150-12111)
Intake Manifold Gasket – Fits Yanmar 3JH Series Marine Diesel Engines (Replaces 129150-12111) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
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.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Intake Manifold Gasket – Fits Yanmar 3JH Series Marine Diesel Engin...
Product Details
This is a high-quality aftermarket Intake Manifold Gasket – Fits Yanmar 3JH Series Marine Diesel Engines (Replaces 129150-12111). It is designed for Yanmar 3JH series marine diesel engines (3JH2, 3JH3, 3JH4, 3JH5 and their variants) manufactured from approximately 1990 to the present, ensuring a precise fit and reliable seal.
This part is a direct replacement for Yanmar OEM part numbers 129150-12111 and 129150-77511.
- Designed for direct, hassle-free installation.
- Engineered for the high-temperature marine diesel environment.
- Resistant to pressure and engine vibration to ensure a durable seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number | Notes |
|---|---|---|
| Yanmar | 129150-12111 | Primary OEM Number |
| Yanmar | 129150-77511 | Alternate Part Number |
Engine & Model Compatibility
Confirm your engine model and year in the tables below.
This gasket is known to fit a wide range of Yanmar marine and industrial diesel engines. Please verify your specific model for an exact match.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yanmar | 3JH2, 3JH2-TE, 3JH2-E, 3JH2-L | 4-Stroke | 129150-12111 | |
| Yanmar | 3JH25A | 4-Stroke | 129150-12111 | |
| Yanmar | 3JH3, 3JH3-YEU-E | 4-Stroke | 129150-12111 | |
| Yanmar | 3JH4E | 4-Stroke | 129150-12111 | |
| Yanmar | 3JH5AE, 3JH5E | 4-Stroke | 129150-12111 | |
| Yanmar | 3TNE84, 4TNE84 | 4-Stroke | 129150-12111 | Industrial Engine (Per DieselPartsDirect) |
| Yanmar | YEG20TL, YEG22SL | 4-Stroke | 129150-12111 | Generator Models |
| Yanmar | 3TN88, 4TN82 | 4-Stroke | 129150-12111 | Industrial Engine (Per DieselPartsDirect) |
| Yanmar | 3TH75L, 3TH82E | 4-Stroke | 129150-12111 | Industrial Engine (Per DieselPartsDirect) |
| Yanmar | 3TNE84-TFL3, 3TNE84T-FL3 | 4-Stroke | 129150-12111 | Industrial Engine (Per OriginalParts4You) |
| Yanmar | 3TNE84T-FL, 3TNE84T-FL2 | 4-Stroke | 129150-12111 | Industrial Engine (Per OriginalParts4You) |
Technical Specs
- Product Type
- Intake Manifold Gasket
- Installation
- Direct replacement
- Fuel Type
- Diesel
- Material
- Heat-resistant gasket material
- Dimensions
- 28.0" L x 6.0" W x 0.1" H
- Weight
- 0.45 kg (0.99 lb)
- Operating Temperature
- Heat-resistant; designed for marine diesel exhaust manifold applications
- Other Technical Attributes
- Pressure-tolerant, vibration-resistant
- Warranty
- Manufacturer warranty for defects
What’s in the Box
- 1 x Intake Manifold Gasket (Replaces 129150-12111 / 129150-77511)
Installation Notes
- Ensure the engine is completely cool and disconnect the boat's battery.
- Drain coolant if necessary to avoid spills when the manifold is removed.
- Clearly label and disconnect any wires, hoses, or linkages attached to the intake manifold.
- Loosen and remove the manifold mounting bolts in the sequence recommended by the manufacturer to prevent warping.
- Carefully detach the manifold from the engine block.
- Remove the old gasket. Thoroughly clean both the cylinder head and manifold mating surfaces to remove all old gasket material and carbon deposits.
- Position the new gasket, making sure it aligns with all bolt holes and ports.
- Re-install the intake manifold, starting all bolts by hand.
- Tighten the manifold bolts to the OEM-specified torque in the correct sequence. Do not overtighten.
- Reconnect all previously removed lines and electrical connectors.
- Refill coolant if drained, and check all fluid levels before starting the engine.
- Start the engine and check for any intake leaks.
Troubleshooting & FAQ
How do I know if this gasket fits my exact engine model?
The best way to confirm is by matching your old part number to the ones listed in our Part Number Matrix (129150-12111 or 129150-77511). You can also check your model against the compatibility list. If you are still unsure, please contact us with your engine's model and serial number before ordering.
What are the signs of a failing intake manifold gasket?
Common symptoms include a rough idle, poor engine performance, coolant leaks (which may appear as external drips or mix with oil), and engine overheating. You might also hear a vacuum leak (a hissing sound) around the manifold area.
Is this part identical to Yanmar part number 129150-77511?
Yes, 129150-77511 is listed as an alternate OEM part number for 129150-12111. This gasket is designed to replace both part numbers directly with the same form, fit, and function.
Do I need to use gasket sealant or adhesive with this part?
Typically, modern gaskets like this are designed to be installed dry. However, always refer to your specific Yanmar service manual for the final word. Some applications may recommend a light tacking agent, but overuse of sealant can cause blockages.
What is the difference between an OEM part and an aftermarket part?
This listing is an aftermarket replacement, not an OEM component. It has been manufactured in an ISO 9002 facility and is built to meet or exceed OEM-level specifications using comparable high-quality materials. Our parts are batch-inspected to ensure consistency and reliability.
How fast do you ship and what are the costs?
We ship worldwide quickly, with typical transit times between 5–15 days for most destinations. Standard shipping is free on all orders. If available for your location, expedited shipping options and their costs will be displayed at checkout.
What is your warranty and returns policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. Should you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchasing. If anything differs—even if your model is listed as compatible—do not purchase.
- This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation is strongly recommended for safety, performance, and to prevent engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — Our direct-sourcing model allows us to provide fair pricing without compromising on materials or quality control.
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.
