Raw Water Pump – Fits Yanmar 6LY2 Series Engines (Replaces 119574-42502)
Raw Water Pump – Fits Yanmar 6LY2 Series Engines (Replaces 119574-42502) 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
Raw Water Pump – Fits Yanmar 6LY2 Series Engines (Replaces 119574-4...
Product Details
This bronze construction Raw Water Pump – Fits Yanmar 6LY2 Series Engines is a direct-fit replacement designed for various Yanmar 6LY2 series diesel marine engines (315–440 HP). It serves as the main engine cooling pump, circulating sea water through the cooling system to maintain optimal operating temperatures.
This component directly replaces Yanmar part number 119574-42502 (which supersedes 119574-42500, 119574-42501, and 719574-42700) and Johnson part number 10-13170-01.
- Designed for direct OEM replacement installation.
- Self-priming pump design with a 15 ft suction lift capability when wet.
- Features a heavy-duty bronze housing for superior corrosion resistance in marine environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yanmar | 119574-42502 | Supersedes 119574-42500, 119574-42501, 719574-42700 |
| Johnson | 10-13170-01 | Direct cross-reference |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This pump is compatible with the following Yanmar 6LY2 series marine engines.
| Brand | Model | Stroke | OEM Part No. |
|---|---|---|---|
| Yanmar | 6LY2-ST | 4-Stroke | 119574-42502 |
| Yanmar | 6LY2-STVY | 4-Stroke | 119574-42502 |
| Yanmar | 6LY2-WST | 4-Stroke | 119574-42502 |
| Yanmar | 6LY2-WDT | 4-Stroke | 119574-42502 |
| Yanmar | 6LY2-WDTZY | 4-Stroke | 119574-42502 |
| Yanmar | 6LY2M-WDT | 4-Stroke | 119574-42502 |
| Yanmar | 6LY2M-WST | 4-Stroke | 119574-42502 |
| Yanmar | 6LYA-STP | 4-Stroke | 119574-42502 |
| Yanmar | 6LYA-STE | 4-Stroke | 119574-42502 |
| Yanmar | 6LYA-UTE | 4-Stroke | 119574-42502 |
| Yanmar | 6LY2-STE | 4-Stroke | 119574-42502 |
| Yanmar | 6LY2A-STP | 4-Stroke | 119574-42502 |
| Yanmar | 6LY2A-UTP | 4-Stroke | 119574-42502 |
Technical Specs
- Product Type
- Raw Water / Sea Water Engine Cooling Pump
- Installation
- Direct OEM Replacement
- Housing Material
- Bronze
- Impeller Material
- Neoprene
- Shaft Construction
- 3X series non-magnetic marine grade
- Seal Type
- Long life mechanical seal
- End Covers
- O-Ring sealed
- Priming
- Self-priming with 15 ft suction lift (when impeller is wet)
- Product Dimensions
- 34.0 cm L x 22.0 cm W x 22.0 cm H
- Weight
- 6.12 kg (13.5 lbs)
What’s in the Box
- 1x Complete Raw Water Pump Assembly
Installation Notes
- Ensure the engine is completely cool and the battery is disconnected.
- Close the raw water intake seacock to prevent water from entering the vessel.
- Place a catch pan under the existing pump to manage any spilled coolant or water.
- Carefully loosen the hose clamps and detach the inlet and outlet hoses from the pump.
- Remove the mounting bolts securing the old pump to the engine block.
- Clean the engine mounting surface and inspect hoses for cracks or wear, replacing if necessary.
- Mount the new pump onto the engine, ensuring a flush fit. Torque bolts to manufacturer specs.
- Reconnect the hoses and tighten clamps securely.
- Open the seacock, reconnect the battery, and start the engine.
- Immediately check the pump and all connections for leaks.
Troubleshooting & FAQ
How do I know if my raw water pump needs to be replaced?
Common signs of a failing pump include engine overheating, a reduction in water flow from the exhaust, visible water leaks from the pump's weep holes or seals, and grinding or squealing noises from the pump assembly.
What maintenance does this pump require?
Regularly inspect for leaks. The internal neoprene impeller is a wear item and should be inspected at least once a year and replaced if you find cracks, stiffness, or missing vanes. Always follow your engine's service manual for recommended intervals.
Will this fit an engine other than a Yanmar 6LY2 series?
No. This pump is specifically engineered to fit the Yanmar 6LY2 series engines listed in the compatibility table. Using it on other models may lead to improper fitment, poor performance, or engine damage.
Is the impeller pre-installed?
Yes, the pump comes as a complete assembly with a new neoprene impeller installed and ready for installation.
Is this an OEM part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty and return policy?
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
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
