Onan 815-0283 Water Pump Cover Screw
The Onan 815-0283 Water Pump Cover Screw is the correct fastener for its position on the Onan pump. Length, thread and head style are all specified, because a fastener in a pump that sees raw water has to clamp the right amount and has to fit the counterbore it sits in without fouling anything behind it.
These screws corrode, seize and round off. Salt gets under the head, the threads pick up in the housing, and eventually one shears when the pump is opened. Replacing the set whenever they look tired is far cheaper than extracting a broken screw from a pump body. This part is listed for Onan water pumps 131-0165 and 131-0267 on MCCK 4.0 and 6.5 kW, MDJE 7.5 kW and MDJ-A, B and E generator sets. The same screw is used as the cam screw in some builds.
Key Features
- Correct length, thread and head style for its position on the pump
- Clamps the joint to the designed load without bottoming out
- Direct replacement for corroded, seized or rounded originals
- Sized to the Onan pump housing and cover pattern
- Inexpensive to keep as a spare set aboard
Applications
- Raw water pump service on Onan marine generator sets
- Replacing corroded or rounded pump fasteners
- Reassembly after an impeller or cover change
- Building a spares kit for seasonal pump maintenance
Specifications
- Brand: Onan
- Manufacturer Part Number: 815-0283
- Part Type: Cover Screw
- Fits: Onan water pumps 131-0165 and 131-0267 on MCCK 4.0 and 6.5 kW, MDJE 7.5 kW and MDJ-A, B and E generator sets
- Quantity Per Pump: 4
- Condition: New
- Shipping Weight: 0.1 lb
Frequently Asked Questions
Q: Should I use antiseize?
A marine grade antiseize on the threads makes the next service far easier, provided your Onan service literature does not call for a thread locking compound instead.
Q: How many are fitted per pump?
It varies by position and by pump. Count what comes out and match it before you order.
Q: What is the right tightening pattern?
Cross pattern, in stages, so the cover or flange pulls down evenly and the gasket compresses the same all round.
Q: What if one shears off in the housing?
Stop before it gets worse. Penetrating fluid, heat and a proper extractor, or take the pump to a machine shop rather than drilling it freehand.
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 cover screw.
CLRMarine
