Connecting Rod Bearing (Mark 5) – Fits Yanmar 6LP/6LPA Series Marine Engines (Replaces 119770-01030)
Connecting Rod Bearing (Mark 5) – Fits Yanmar 6LP/6LPA Series Marine Engines (Replaces 119770-01030) 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
Connecting Rod Bearing (Mark 5) – Fits Yanmar 6LP/6LPA Series Marin...
Product Details
This is a high-quality aftermarket Connecting Rod Bearing (Mark 5) designed for a precise fit in Yanmar 6LP and 6LPA series marine diesel engines. It serves as a critical internal component, ensuring smooth operation and longevity of the engine's rotating assembly. This bearing is manufactured to meet or exceed original equipment specifications for reliable performance.
This part is a direct replacement for Yanmar part number 119770-01030 and RECMAR 119770-01030.
- Installation Location: Engine Internal
- Fuel Compatibility: Diesel
- Fitment: Direct Fit
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 119770-01030 |
| RECMAR | 119770-01030 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This component is designed for specific Yanmar 6LP and 6LPA series engines.
| Brand | Model | Stroke | OEM Part No. |
|---|---|---|---|
| Yanmar | 6LP-DT | 4-Stroke | 119770-01030 |
| Yanmar | 6LP-DTE | 4-Stroke | 119770-01030 |
| Yanmar | 6LP-DTZE | 4-Stroke | 119770-01030 |
| Yanmar | 6LP-DTZY | 4-Stroke | 119770-01030 |
| Yanmar | 6LP-ST | 4-Stroke | 119770-01030 |
| Yanmar | 6LP-STE | 4-Stroke | 119770-01030 |
| Yanmar | 6LP-STZE | 4-Stroke | 119770-01030 |
| Yanmar | 6LP-STZY | 4-Stroke | 119770-01030 |
| Yanmar | 6LP-WDT | 4-Stroke | 119770-01030 |
| Yanmar | 6LP-WDTZY | 4-Stroke | 119770-01030 |
| Yanmar | 6LPA-DTP | 4-Stroke | 119770-01030 |
| Yanmar | 6LPA-DTZP | 4-Stroke | 119770-01030 |
| Yanmar | 6LPA-STP | 4-Stroke | 119770-01030 |
| Yanmar | 6LPA-STZ | 4-Stroke | 119770-01030 |
Technical Specs
- Product Type
- Connecting Rod Bearing (Mark 5)
- Installation
- Engine Internal
- Fuel Type
- Diesel
- Connection
- Internal Engine Component
- Dimensions
- 9.0" L x 6.5" W x 5.5" H
- Fitting Type
- Direct Fit
- Other Technical Attributes
- Mark 5 designation indicates specific size/clearance requirements
What’s in the Box
- 1 x Connecting Rod Bearing (119770-01030)
Installation Notes
- Drain engine oil and coolant completely.
- Remove the oil pan to access the engine's bottom end.
- Identify and mark the connecting rod cap for the corresponding cylinder.
- Carefully unbolt and remove the connecting rod cap, keeping the orientation noted.
- Remove the old bearing shells from both the connecting rod and the cap.
- Thoroughly clean the bearing surfaces on the rod and cap, ensuring they are free of oil and debris.
- Apply a liberal amount of engine assembly lube to the new bearing shells.
- Install the new bearing halves, ensuring the locking tabs are correctly seated in their notches.
- Reinstall the connecting rod cap and torque the bolts to the manufacturer's specified value and sequence.
- Check for proper oil clearance using Plastigage as detailed in your engine's service manual.
- Rotate the crankshaft by hand to ensure there is no binding.
- Reassemble all components in reverse order and refill the engine with new oil and coolant before starting.
Troubleshooting & FAQ
What does the "Mark 5" designation mean?
The "Mark 5" indicates a specific thickness and clearance for the bearing shell. Yanmar produces connecting rod bearings in several sizes (Mark 2-6) to account for slight manufacturing variances in crankshafts and connecting rods. It is crucial to install the same mark number as the one you are replacing to ensure correct oil clearance.
How do I know if this is the right size for my engine?
You must verify the mark number on your existing bearings. This number is typically stamped on the edge of the bearing shell. Using the wrong size can lead to rapid engine wear or catastrophic failure. If you cannot find a mark, consult a certified marine mechanic or your Yanmar service manual.
What are the signs of a failing connecting rod bearing?
Common symptoms include a persistent, rhythmic knocking or ticking sound from the engine (rod knock) that increases with RPM, low oil pressure, and the presence of metallic particles in the engine oil.
Should I replace bearings individually or as a complete set?
While this part is sold individually, it is best practice to replace all connecting rod bearings at the same time during an engine rebuild. This ensures consistent clearances and wear characteristics across all cylinders.
Is any special tooling required for installation?
Yes, professional installation requires specialized tools, including a torque wrench, micrometer, and Plastigage for measuring oil clearances. Access to the official engine service manual for torque specifications is essential.
What is the typical maintenance interval for these bearings?
Connecting rod bearings are not a routine maintenance item. They are typically replaced only during a complete engine overhaul or if they show signs of failure. Their lifespan depends on clean oil, proper maintenance, and operating conditions.
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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