OBERDORFER 402M-03 Engine Cooling Flexible Impeller Pump - Head and Pulley

OBERDORFER 402M-03 Engine Cooling Flexible Impeller Pump - Head and Pulley

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OBERDORFER 402M-03 Engine Cooling Flexible Impeller Pump - Head and Pulley

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Oberdorfer - 402M-03 Engine Cooling Flexible Impeller Pump. Pipe Size 1 1/4" ID - 36 GPM - Mechanical Seal Type - 7 lbs Weight. All bronze construction corrosion resistance. Ideal for marine service. O-Ring Seal between body and cover eliminates gasket problems. High chrome nickel stainless steel shaft. Two sealed ball bearings spaced for maximum load ability.

Part Number: 402M-03
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OB 402M-03


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Oberdorfer - 402M-03 Engine Cooling Flexible Impeller Pump - 36 GPM - 7 lbs weight - Mechanical Seal Type


These Flexible Impeller pumps are made of high quality bronze of maximum corrosion resistance. All shafts consist of stainless steel grade 303. Top of the line models have ball bearings and mechanical seals while others have bronze or carbon bearings and lip type seals. Impellers are made of Neoprene Rubber. Nitrile impellers are available as an option. Flexible blades on the periphery of the impeller provide the pumping action. While the impeller rotates the liquid between the blades is continuously squeezed out into the discharge port by a machined in cam located inside the pump chamber.


  • Bronze Construction - Corrosion Resistance
  • Pulley Included
  • Reversible Wearplate
  • Polytetrafluoroethylene (PTFE) Barrier Seals Protecting Ball Bearings
  • Mechanical Carbon Ring, Ceramic Face Main Pump Seal
  • Two Sealed Ball Bearings Spaced for Maximum Load Ability
  • Large Vent & Drain Openings Separate Seal & Bearing Areas
  • Shaft Slinger for Additional Bearing Protection
  • Neoprene Impeller
  • High Chrome Nickel Stainless Steel Shaft
  • O-Ring Seal Between Body and Cover Eliminates Gasket Problems
  • Impeller & Cam Easily Replaced

Liquids and Temperatures 

Liquids compatible with neoprene can be pumped including fresh and salt-water solution and mild chemicals. Do not pump severe solvents or acids. When possible, flush pump with fresh water after each usage.

Extremes of cold and heat will affect impeller life. Limits of 40°F to 180°F should be observed. Do not allow liquid in pump to freeze. Drain pump by loosening cover screws. Use methyl alcohol based anti-freeze compounds such as Zerex, Shell Zone, Pyro Permanent, Permagard, or Dowgard.


Select proper belt size to match pulley groove as shown on dimension drawing on back. Belt must run sufficiently tight to prevent slippage. Do not over tighten. Pump will operate satisfactorily when mounted in any position. Special mounting holes are provided as part of extended cover casting.

Direction of shaft rotation determines inlet and outlet ports (see dimension drawing). Prior to installation, rotate the pump manually in direction of rotation to set flexible blades in direction desired.

Rubber impellers generate high rubbing friction unless lubricated by liquid being pumped. DO NOT RUN DRY. Lack of liquid will cause impeller to burn up.

Suction Lift

Suction lift of 15 feet is possible when impeller is wet. Suction lines must be air tight in order for pump to self-prime. A foot valve at beginning of suction line is recommended.




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