Onan 815-0477 Water Pump Cam Screw
The Onan 815-0477 Water Pump Cam Screw is a specified pump fastener, not a generic bolt. On a pump that is opened for every impeller change, fasteners get the most handling of any part, and corroded or rounded ones are a common reason a routine service turns into a long afternoon.
A rounded head or a stretched thread will not clamp properly, and a joint that is not clamped properly weeps and then corrodes. Because these fasteners are opened at every impeller service, most owners simply keep a set aboard and change them out as they get tired. This part is listed for Onan water pump 131-0257 (casting 170-3172) on MCCK 4.0 and 6.5 kW and MDJE 7.5 kW generator sets.
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: 815-0477
- Part Type: Cam Screw
- Fits: Onan water pump 131-0257 (casting 170-3172) 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: Can I use a stainless fastener from the hardware store?
Length and thread have to match exactly, and a screw that is too long will foul the pump internals. Use the specified part.
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.
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 cam screw.
CLRMarine
