Yanmar 119578-42670 Mechanical Seal Retainer for 6LY3
The Yanmar 119578-42670 is the genuine mechanical seal retainer for 6LY3 Series engines. It closes one end of the pump and, just as importantly, forms the flat face the impeller vanes seal against on that side of the pumping chamber.
Whenever the cover comes off, renew its seal and tighten the screws evenly in a cross pattern rather than working round the circle. That single habit is what keeps a cover flat for years, and it costs nothing.
Key Features
- Genuine Yanmar replacement mechanical seal retainer
- Fits 6LY3 Series engines
- One per pump
- Restores a flat sealing face for the impeller
- Replaces a distorted, pitted or corroded cover
- Renew the cover seal at the same time
Applications
- 6LY3 Series engines
- Raw water pump rebuilds and impeller changes
- Curing air being drawn in at the cover joint
- Replacing a cover bowed by overtightening
- Repairing corrosion damage on a pump that has seen years of salt water
- Spring commissioning and layup service
Specifications
- Brand: Yanmar
- Manufacturer: Yanmar Marine
- Manufacturer Part Number: 119578-42670
- Part Type: Mechanical Seal Retainer
- Fits: 6LY3 Series engines
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
Q: Should the seal be replaced with the cover?
Yes. It has been disturbed and it takes a set in the joint, and a new cover on an old seal is a leak waiting to happen.
Q: Can a pitted cover face be cleaned up?
Light polishing is reasonable if it leaves the face flat. Anything that takes the face out of flat does more harm than the pitting did.
Q: Does the cover affect how much water the pump moves?
Directly. It is one of the two faces the impeller vanes seal against, so a pitted or bowed cover lets water slip back inside the pump instead of leaving the discharge.
Q: How do I tell if the cover is distorted?
Lay it on something known to be flat and look for daylight under the edges, particularly between the screw holes. A bowed cover will not seal and will not present a flat face to the impeller.
Not sure this is the right part? Send us a Picture of the Pump Plate on your pump and the CLR Marine team will confirm the correct mechanical seal retainer.
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