Crankshaft Bearing – Fits Yanmar Diesel Engines (Replaces 129150-02800)
Crankshaft Bearing – Fits Yanmar Diesel Engines (Replaces 129150-02800) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Crankshaft Bearing – Fits Yanmar Diesel Engines (Replaces 129150-02...
Product Details
This aftermarket Crankshaft Bearing – Fits Yanmar Diesel Engines (Replaces 129150-02800) is designed for reliable performance in various Yanmar tractor and small engine models. It is compatible with F/FX series tractors from 18 to 435 HP, as well as 3T78, 3TNE78, 3TNE82, 3D82E, 4TNE88, and 4TNV88 industrial engines.
It serves as a direct replacement for Yanmar part numbers 129150-02800, 729150-02800, and 129150-02931, ensuring a precise fit for listed applications.
- Mounts directly into the engine block.
- Engineered as a standard size bearing for diesel engines.
- Brand new condition, ready for installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yanmar | 129150-02800 | Primary replacement part. Also referenced as 119810-02800 for 3T78 engines. |
| Yanmar | 729150-02800 | Interchangeable part number. |
| Yanmar | 129150-02931 | Used in 4TNE88 & 4TNV88 engines. May have specific application differences. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yanmar applications, verify your model and OEM part number to ensure correct fitment. This bearing fits a wide range of F/FX series tractors and industrial engines.
| Brand | Model | Rated HP | OEM Part No. |
|---|---|---|---|
| Yanmar | F18 | 18 | 129150-02800 |
| Yanmar | F20 | 20 | 129150-02800 |
| Yanmar | F22 | 22 | 129150-02800 |
| Yanmar | F24 | 24 | 129150-02800 |
| Yanmar | FX24 | 24 | 129150-02800 |
| Yanmar | FX26 | 26 | 129150-02800 |
| Yanmar | FX28 | 28 | 129150-02800 |
| Yanmar | FX32 | 32 | 129150-02800 |
| Yanmar | F37D | 37 | 129150-02800 |
| Yanmar | FX42 | 42 | 129150-02800 |
| Yanmar | F195 | 129150-02800 | |
| Yanmar | FX195 | 129150-02800 | |
| Yanmar | F215 | 129150-02800 | |
| Yanmar | FX215 | 129150-02800 | |
| Yanmar | F235 | 129150-02800 | |
| Yanmar | FX235 | 129150-02800 | |
| Yanmar | F255 | 129150-02800 | |
| Yanmar | FX255 | 129150-02800 | |
| Yanmar | F265 | 129150-02800 | |
| Yanmar | FX265 | 129150-02800 | |
| Yanmar | FX285 | 129150-02800 | |
| Yanmar | FX305 | 129150-02800 | |
| Yanmar | FX335 | 129150-02800 | |
| Yanmar | FX435 | 129150-02800 |
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Yanmar | 3T78 | 129150-02800 | Also referenced as 119810-02800 |
| Yanmar | 3TNE78 | 129150-02800 | |
| Yanmar | 3TNE82 | 129150-02800 | |
| Yanmar | 3D82E | 129150-02800 | Komatsu application |
| Yanmar | 4TNE88 | 129150-02931 | Also uses 129001-02800 |
| Yanmar | 4TNV88 | 129150-02931 | Also uses 129001-02800 |
Technical Specs
- Product Type
- Crankshaft Main Bearing
- Installation
- Engine block mounting
- Fuel Type
- Diesel
- Dimensions
- 7.0" H x 4.5" W x 6.5" L
- Weight
- 0.13 lbs (0.059 kg)
- Condition
- New
- Warranty
- Manufacturing defects warranty (varies by supplier)
- Other Technical Attributes
- Standard size bearing
What’s in the Box
- 1 x Crankshaft Main Bearing (129150-02800)
Installation Notes
- Ensure the engine is off, cool, and disconnected from power sources.
- Drain the engine oil completely to avoid spills.
- Access the engine block and locate the existing crankshaft main bearings. This may require removing the oil pan and other components.
- Carefully remove the old bearing caps and bearings, noting their orientation.
- Thoroughly clean the crankshaft journals and bearing saddles, ensuring they are free of oil, debris, and scoring.
- Lubricate the new bearing and crankshaft journal with clean engine assembly lube.
- Install the new crankshaft main bearing, ensuring it is correctly seated in its saddle.
- Reinstall the bearing cap and torque the bolts to the manufacturer's specified values and sequence.
- Check for proper crankshaft rotation and clearance (plastigage is recommended).
- Reassemble all removed components, refill the engine with new oil, and check for leaks before starting.
Troubleshooting & FAQ
How do I know if this bearing fits my engine?
This bearing fits a wide range of Yanmar models. The best way to ensure compatibility is to match your existing part number to one of the cross-references: 129150-02800, 729150-02800, or 129150-02931. Also, check the compatibility tables on this page for your specific tractor or engine model.
What are the signs of a failing crankshaft bearing?
Common symptoms of a worn or failed crankshaft bearing include a deep, knocking sound from the engine that increases with RPM, low oil pressure, and the presence of metallic shavings (bearing material) in the engine oil upon inspection.
What is the difference between part numbers 129150-02800 and 129150-02931?
While often interchangeable, part number 129150-02931 is specifically noted for use in Yanmar 4TNE88 and 4TNV88 engines. There may be minor material or tolerance differences for those applications. Always use the part number specified for your engine for optimal performance and longevity.
Is this a standard size bearing or oversized?
This is a standard size bearing. It is intended for use with crankshafts that have not been machined or ground down. If your crankshaft has been serviced, you may require an undersized bearing.
Can I replace just one main bearing?
While it is possible to replace a single bearing, it is highly recommended to replace all main bearings as a complete set. This ensures even wear, consistent oil clearances, and proper engine balance, preventing premature failure of other components.
What is the recommended replacement interval?
Crankshaft main bearings do not have a fixed replacement interval and are typically only replaced during a complete engine overhaul or when signs of failure appear. Their lifespan depends on engine operating conditions, maintenance, and lubrication quality.
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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