Onan 132-0310 Water Pump Impeller
The Onan 132-0310 Water Pump Impeller is the flexible impeller that does the actual pumping inside the raw water pump on your Onan set. Its vanes flex as they sweep past the cam, trapping sea water on the inlet side and carrying it around to the discharge port. Because the vanes stay in contact with the wearplate and the pump housing, the impeller is also what gives the pump its dry suction lift when the set is first cranked over.
Impellers fail from heat and from age. Running even a few seconds with a blocked strainer or a closed seacock softens the vanes and they take a set, tear at the root, or shed tips that travel downstream and block the heat exchanger tubes. Replace the impeller on a schedule rather than waiting for the overheat alarm, and always account for every vane that comes out. If a vane is missing, find it before you close the pump up. This part is listed for Onan water pump 132-0284 on MAJB 2.5 and 3.0 kW generator sets.
Key Features
- Flexible vane design that primes dry and holds prime at low cranking speed
- Vane profile and bore diameter matched to the Onan pump housing and cam
- Carries the full raw water flow to the heat exchanger and exhaust elbow
- Direct replacement for the original impeller, no pump modification required
- Serviceable through the pump end cover without pulling the pump off the engine
Applications
- Scheduled raw water pump service on Onan marine generator sets
- Restoring cooling flow after an overheat or a dry running episode
- Winter layup and spring recommissioning impeller changes
- Rebuilding a raw water pump alongside the wearplate, cam, gasket and seal
Specifications
- Brand: Onan
- Manufacturer Part Number: 132-0310
- Part Type: Impeller
- Fits: Onan water pump 132-0284 on MAJB 2.5 and 3.0 kW generator sets
- Quantity Per Pump: 1
- Condition: New
- Shipping Weight: 1.5 lb
Frequently Asked Questions
Q: How often should this impeller be changed?
Most operators change a raw water impeller once a season or every couple of hundred running hours, whichever comes first, and keep a spare aboard. Heavy silt or shell debris in the water shortens that interval.
Q: Do I need to remove the pump from the engine to change it?
On most Onan pumps the impeller comes out through the end cover with the pump still bolted in place, provided you have room to get a puller or a pair of pliers onto the hub.
Q: What should I lubricate the new impeller with?
Glycerin or plain soapy water. Petroleum grease and oil attack the vane compound and shorten its life.
Q: Which way does the impeller go in?
It is fitted so the vanes trail against the direction of shaft rotation. Rolling the vanes over as you press it home sets them the right way.
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 impeller.
CLRMarine
