Onan 3008400 Pump Mounting Gasket
The Onan 3008400 Pump Mounting Gasket is a sealing gasket for the Onan pump joint it serves. Besides stopping leaks, it holds the correct standoff between the two faces it separates, so the impeller and wearplate keep their designed clearance. Reusing a crushed or torn gasket changes that clearance and costs the pump flow.
Salt crystallizes in any joint that seeps, and that creeping corrosion will eventually damage the flange faces themselves. A gasket costs very little compared with a pump body, so change it whenever the joint is broken. Scrape both faces clean, check them for flatness, and pull the fasteners down evenly rather than one at a time.
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: 3008400
- Part Type: Pump Mounting Gasket
- Quantity Per Pump: 1
- Condition: New
- Shipping Weight: 0.1 lb
Frequently Asked Questions
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.
Q: Do I need sealant as well?
Normally no. These gaskets are designed to seal dry on clean faces. Sealant can squeeze into the pump and cause more trouble than it solves.
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 pump mounting gasket.
CLRMarine
