Yanmar Engine Crankshaft Bearing Kit 0.25 – Fits Yanmar 6LP Series Marine Diesel Engines (Replaces 119770-02031)
Yanmar Engine Crankshaft Bearing Kit 0.25 – Fits Yanmar 6LP Series Marine Diesel Engines (Replaces 119770-02031) is backordered and will ship as soon as it is back in stock.
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Yanmar Engine Crankshaft Bearing Kit 0.25 – Fits Yanmar 6LP Series ...
Product Details
This is a replacement Yanmar Engine Crankshaft Bearing Kit 0.25 designed for Yanmar 6LP Series marine diesel engines, which were common in commercial and recreational vessels from the late 1990s through the early 2000s. This oversized bearing is for crankshafts that have been machined during a rebuild.
This kit serves as a direct replacement for Yanmar part numbers 119770-02030 and 119770-02031.
- Installation Method: Direct replacement
- Fuel Type: Diesel
- Technical Note: Oversized by 0.25mm compared to the standard bearing.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yanmar | 119770-02030 | Superseded by 119770-02031 |
| Yanmar | 119770-02031 | Current |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This bearing kit is designed for a wide range of Yanmar 6LP series engines.
| Brand | Model | Stroke | OEM Part No. |
|---|---|---|---|
| Yanmar | 6LP-DT | 4-Stroke | 119770-02031 |
| Yanmar | 6LP-DTE | 4-Stroke | 119770-02031 |
| Yanmar | 6LP-DTZE | 4-Stroke | 119770-02031 |
| Yanmar | 6LP-DTZY | 4-Stroke | 119770-02031 |
| Yanmar | 6LP-ST | 4-Stroke | 119770-02031 |
| Yanmar | 6LP-STE | 4-Stroke | 119770-02031 |
| Yanmar | 6LP-STZE | 4-Stroke | 119770-02031 |
| Yanmar | 6LP-STZY | 4-Stroke | 119770-02031 |
| Yanmar | 6LP-WDT | 4-Stroke | 119770-02031 |
| Yanmar | 6LP-WDTZY | 4-Stroke | 119770-02031 |
| Yanmar | 6LP-WSTZY | 4-Stroke | 119770-02031 |
| Yanmar | 6LPA-DTP | 4-Stroke | 119770-02031 |
| Yanmar | 6LPA-DTZP | 4-Stroke | 119770-02031 |
| Yanmar | 6LPA-STP | 4-Stroke | 119770-02031 |
| Yanmar | 6LPA-STP2 | 4-Stroke | 119770-02031 |
| Yanmar | 6LPA-STZP | 4-Stroke | 119770-02031 |
| Yanmar | 6LPA-STZP2 | 4-Stroke | 119770-02031 |
| Yanmar | 6LPA-STZP3 | 4-Stroke | 119770-02031 |
Technical Specs
- Product Type
- Crankshaft Bearing Kit, 0.25 mm Oversize
- Installation
- Direct replacement
- Fuel Type
- Diesel
- Weight
- 0.45 lbs (0.2 kg)
- Product Dimensions
- 20.0" L x 11.0" W x 10.0" H
- Other Technical Attributes
- Oversized by 0.25mm compared to standard bearing
What’s in the Box
- Crankshaft Bearing Kit (119770-02031)
Installation Notes
- Ensure the engine is off, cool, and the battery is disconnected.
- Drain engine oil completely.
- Access the crankshaft by removing the oil pan and any other obstructing components as per your service manual.
- Carefully remove the old bearing caps and bearings, noting their original positions and orientation.
- Thoroughly clean the crankshaft journals and bearing saddles of all oil and debris.
- Verify the crankshaft journals have been machined for a 0.25mm oversize bearing before proceeding.
- Install the new bearings, ensuring they are correctly seated and oriented.
- Liberally apply assembly lube to the new bearings and journals.
- Reinstall the bearing caps and torque the bolts to the manufacturer's specified sequence and values.
- Reassemble all previously removed components, install a new oil filter, and refill the engine with fresh oil.
- Before starting the engine, check for leaks and prime the oil system if required.
Troubleshooting & FAQ
What does "0.25mm Oversize" mean for this bearing kit?
This means the bearing is designed to fit a crankshaft journal that has been machined (ground down) by 0.25mm from its standard diameter. This is a common practice during an engine rebuild to restore a worn or damaged crankshaft surface. It will NOT fit a standard, un-machined crankshaft.
How can I confirm I need an oversized bearing?
A professional mechanic or engine machine shop must measure your crankshaft's main bearing journals with a micrometer. If the journals have been ground down, they will determine the correct oversize dimension needed. Do not install oversized bearings without this confirmation.
What are the signs of a failing crankshaft bearing?
Key symptoms include a deep knocking or rumbling sound from the engine that often changes with RPM, low or flickering oil pressure readings, and the presence of metallic particles or flakes in the engine oil and filter.
Is this a complete set for the entire crankshaft?
This kit contains the main bearings for the crankshaft. Please compare the contents shown in the product images and the part number with your engine's service manual to ensure it meets the full requirements for your specific repair job.
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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