Exhaust Gasket – Fits Yanmar 3JH & 4JH Series Marine Engines (Replaces 129472-18090)
Exhaust Gasket – Fits Yanmar 3JH & 4JH Series Marine Engines (Replaces 129472-18090) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Gasket – Fits Yanmar 3JH & 4JH Series Marine Engines (R...
Product Details
This high-temperature resistant Exhaust Gasket is designed for Yanmar 3JH and 4JH series marine diesel engines (1990–present), creating a reliable seal between the exhaust manifold and the mixing elbow or turbocharger.
It is an aftermarket part that directly replaces Yanmar part numbers 129472-18090 and 12947218090.
- Creates a durable seal between the exhaust manifold and the mixing elbow or turbocharger.
- Made from a high-temperature resistant composite material for longevity in harsh marine environments.
- Engineered for 4-stroke diesel Yanmar engines ranging from 20 to 125 HP.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 129472-18090 |
| Yanmar | 12947218090 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yanmar | 3JH2 | 38 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 3JH2-TE | 45 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 3JH2BE | 38 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 3JH2TBE | 45 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 3JH3 | 40 | 4-Stroke | 2000s | 129472-18090 | |
| Yanmar | 3JH3E | 40 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 3JH3Z | 40 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 3JH3Z2 | 40 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 3JH4E | 40 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 3JH5E | 39 | 4-Stroke | 2010s–Present | 129472-18090 | |
| Yanmar | 3JH30A | 29 | 4-Stroke | 2000s–Present | 129472-18090 | Keel cooler spec |
| Yanmar | 4JH2-DTE | 76 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH2-TE | 68 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH2-E | 50 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH2-CE | 50 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH2-DTZ | 76 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JHE | 50 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH-TZ | 100 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH-HTZ | 125 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH-HTBE | 125 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH-TE | 75 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH-TZA | 100 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH-TZAY | 100 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH-TZ1 | 100 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH-TZ2 | 100 | 4-Stroke | 1990s–2000s | 129472-18090 | |
| Yanmar | 4JH3-DTE | 100 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 4JH3-DTZ | 100 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 4JH3-DTZA | 100 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 4JH3-DTZAY | 100 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 4JH3-HTE | 110 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 4JH3-TE | 75 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 4JH3E | 56 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 4JH4-DTE | 110 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 4JH4AE | 54 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 4JH4E | 54 | 4-Stroke | 2000s–2010s | 129472-18090 | |
| Yanmar | 4JH45 | 45 | 4-Stroke | 2010s–Present | 129472-18090 | |
| Yanmar | 4JH57 | 57 | 4-Stroke | 2010s–Present | 129472-18090 | L & U type mixing elbow |
| Yanmar | 4JH5E | 54 | 4-Stroke | 2010s–Present | 129472-18090 | |
| Yanmar | 4JH80 | 80 | 4-Stroke | 2010s–Present | 129472-18090 | |
| Yanmar | 4JHZ | 80–125 | 4-Stroke | 2000s–Present | 129472-18090 | Various configurations |
Technical Specs
- Product Type
- Exhaust Manifold Gasket
- Application
- Manifold to Elbow/Turbo connection
- Material
- High-temperature resistant composite
- Dimensions (approx.)
- 0.1 in H x 8.5 in W x 7.5 in L
- Weight (approx.)
- 28g (0.0625 lbs)
- Compatible Fuel
- Diesel
- Condition
- New
What’s in the Box
- 1 x Exhaust Manifold to Elbow/Turbo Gasket (Replaces 129472-18090)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery before starting work.
- Carefully detach the mixing elbow or turbocharger from the exhaust manifold.
- Thoroughly clean both mating surfaces, removing all residue from the old gasket. A clean, smooth surface is essential for a proper seal.
- Position the new gasket, ensuring all bolt holes are correctly aligned.
- Re-attach the mixing elbow or turbo, tightening the fasteners to the manufacturer’s recommended torque specifications.
- After reconnecting the battery, run the engine and carefully inspect for any exhaust leaks around the new gasket.
Troubleshooting & FAQ
How do I know if this gasket fits my Yanmar engine?
This gasket is specifically made for Yanmar 3JH and 4JH series engines. To guarantee fitment, please find your exact engine model in the compatibility table on this page and confirm it uses OEM part number 129472-18090.
What are the signs of a failing exhaust gasket?
Common symptoms include a louder engine sound, visible black soot or exhaust residue around the manifold-to-elbow connection, a smell of exhaust fumes in the engine bay, or a potential loss of engine performance.
When should this gasket be replaced?
It is best practice to replace this gasket any time you remove the exhaust mixing elbow or turbocharger for service. You should also replace it immediately if you detect any signs of leakage.
Do I need to use sealant with this gasket?
No, this gasket is designed to be installed on a clean, dry surface. Using sealant can interfere with its ability to seal correctly. Ensure both mating surfaces are free of old gasket material, rust, and debris.
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.
Payment & Security
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