Onan 132-0252 Water Pump Pulley
The Onan 132-0252 Water Pump Pulley is the drive input for the pump. Its groove profile has to match the belt and its face has to run true, or the belt wears on one flank, squeals under load, and puts an uneven side load into the pump bearing.
Check the groove with a straightedge across the flanges and look at how deep the belt sits. A belt that rides down on the bottom of the groove has lost its wedging grip, so it slips under load and the set starts running hot even though the pump itself is fine. This part is listed for Onan water pump 131-0165 on MCCK 4.0 and 6.5 kW and MDJE 7.5 kW generator sets.
Key Features
- Correct groove profile and diameter for the original belt drive
- Sets the designed pump speed and raw water flow
- True running face for correct belt alignment
- Bore and drive feature matched to the Onan pump shaft
- Direct replacement for a worn, rusted or bent original
Applications
- Belt driven raw water pump service on Onan generator sets
- Replacing a pulley that is eating or throwing belts
- Correcting belt squeal, slip and overheating under load
- Rebuilding a pump drive end alongside shaft and bearings
Specifications
- Brand: Onan
- Manufacturer Part Number: 132-0252
- Part Type: Water Pump Pulley
- Fits: Onan water pump 131-0165 on MCCK 4.0 and 6.5 kW and MDJE 7.5 kW generator sets
- Quantity Per Pump: 1
- Condition: New
- Shipping Weight: 1 lb
Frequently Asked Questions
Q: Should I replace the belt at the same time?
Yes. A belt that has run on a worn pulley has already been damaged and will not last on the new one.
Q: How do I tell if the pulley is worn?
Look at how deep the belt sits in the groove and check the flanks for rust and polish. A belt riding on the bottom of the groove means the pulley is worn.
Q: Can I fit a different diameter pulley?
No. The diameter sets the pump speed, and changing it changes the raw water flow the cooling system was designed around.
Q: What belt tension should I use?
Use the figures in your Onan service literature. Overtightening a belt is one of the fastest ways to kill a pump bearing.
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 water pump pulley.
CLRMarine
