Onan 132-0303 Water Pump Washer
The Onan 132-0303 Water Pump Washer is the washer specified for this position in the Onan pump. Thickness, bore and outside diameter all matter, because the washer is part of the stack height that sets how far the fastener pulls the joint down.
Because it costs so little, this is a part worth renewing as a matter of course during any pump rebuild rather than reusing something that has already taken its set. It also removes the risk of finding you are one washer short partway through the job. This part is listed for Onan water pump 132-0284 on MAJB 2.5 and 3.0 kW generator sets. It is one of two different washers in this pump, so check the part number rather than the look of the part.
Key Features
- Correct bore, outside diameter and thickness for its position
- Spreads fastener clamping load and protects the surface beneath
- Maintains joint clamp under vibration and thermal cycling
- Direct replacement for the original Onan part
- Cheap to keep as a spare alongside pump fasteners
Applications
- Raw water pump service on Onan marine generator sets
- Reassembly after an impeller, cover or bearing change
- Replacing corroded or flattened original washers
- Building a pump spares kit for the season
Specifications
- Brand: Onan
- Manufacturer Part Number: 132-0303
- Part Type: Washer
- Fits: Onan water pump 132-0284 on MAJB 2.5 and 3.0 kW generator sets
- Quantity Per Pump: 1
- Condition: New
- Shipping Weight: 0.02 lb
Frequently Asked Questions
Q: Which way round does it go?
Plain washers can go either way. If the original was dished or toothed, match its orientation as it came out.
Q: Is stainless always the right choice?
Not always. Use the specified part, because mixing metals in a salt water environment can set up galvanic corrosion at the joint.
Q: Do I need one under every fastener?
Only where the original had one. Adding washers where none were fitted changes the clamped length of the fastener.
Q: How many should I buy?
Most owners order a small surplus, since these are easy to drop into a bilge and awkward to source in a hurry.
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 washer.
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