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Water Pump Replacement or Retrofit, 3/8" Oberdorfer

Part #: Z5279
When the adapter plate is fused to the block from years of corrosion and cannot be removed to install our #Z2857, instead use this version that mounts to the adapter plate like your original raw water pump. Instead of a grease cup, use the included zerk fitting and a grease pump to maintain the internal lubrication. New version of the original raw water pump with 3/8" ports for your 5411, 5424, M-30 Universal Diesel engine.

Includes mounting gasket.
• Mounting holes center to center: 3-1/4"
• Mounting hole diameter: Cleared for 3/8" fasteners
• Mounting flange diameter: 2-7/8"
1) This pump is equipped with 3/8" NPT ports and a male connection on the shaft of the pump (see "More Images" below). If you require a female connection on the pump shaft, please call Catalina Direct tech support at 916/843-1971 for additional assistance.

2) NPT (National Pipe Thread) measurements are an industry standard method of measuring pipe thread sizes. It does not mean that a 3/8" NPT thread can be measured with a tape measure to be 3/8". In fact, a 3/8" female NPT thread measures a little over 1/2" with a tape measure. What is the easiest way to determine positively which size port your pump has? Purchase both a 1/2" and a 3/8" pipe nipple at a hardware store and thread them into your existing pump. Now you know for sure!

3) A very few owners of early Universal 5411 raw water cooled engines report that their engine was equipped with an aftermarket fresh water cooling system. This system had a second Sherwood pump that was different than the raw water pump. The Oberdorfer pump above will not replace the fresh water pump used on this aftermarket kit. There is no known replacement.

Technical Support

Identifying the raw water pump on Universal engines
How do I know which kit I need to  order?
Raw Water Pump Replacement for 5411, 5424, & M-30 Engines
What do I do with all of these extra parts?
Pipe Sizes and Why They Are So Confusing
Why doesn't my 3/8" NPT fitting measure 3/8"?