Onan 132-0256 Water Pump Gasket
The Onan 132-0256 Water Pump Gasket is a one time sealing part. It conforms to both mating faces as the fasteners are pulled down, filling the small imperfections that stop metal on metal joints from sealing against salt water. Once it has been compressed and the joint opened, it cannot be relied on to seal again.
A weeping joint on the suction side of a raw water pump is worse than it looks. The pump draws air rather than pushing water out, so it primes slowly or not at all while showing almost no external leak. Fitting a new gasket and cleaning the faces is the first thing to do when a pump loses its prime overnight. This part is listed for Onan water pump 132-0147 on MDJF 15 kW generator sets. It supersedes gasket 132-0149.
Key Features
- Die cut to the Onan flange and fastener pattern for a drop in fit
- Sets the correct standoff between the mating faces
- Seals against raw sea water and coolant side seepage
- Single use sealing part, no trimming or fitting required
- Inexpensive insurance whenever the joint is opened
Applications
- Raw water pump removal, refitting and overhaul on Onan generator sets
- Sealing the pump to engine joint after a pump change
- Correcting a weeping or salt crusted pump flange
- Stocking as a spare alongside impeller and seal service parts
Specifications
- Brand: Onan
- Manufacturer Part Number: 132-0256
- Part Type: Gasket
- Fits: Onan water pump 132-0147 on MDJF 15 kW generator sets
- Quantity Per Pump: 1
- Condition: New
- Shipping Weight: 1 lb
Frequently Asked Questions
Q: What torque should the fasteners be pulled to?
Follow the figures in your Onan service literature and tighten in a cross pattern, working up to the final torque in stages.
Q: Why does my pump lose prime with no visible leak?
A gasket on the suction side can draw air without passing water outward. That is exactly the failure that makes a pump slow to prime.
Q: Should I buy more than one?
Most owners keep a spare aboard, since a torn gasket during a service will otherwise stop the job until a new one arrives.
Q: Can I reuse the old gasket if it looks intact?
It is not worth it. The gasket has already taken its compression set, and refitting it usually produces a slow weep at the joint.
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 gasket.
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