How to Test a Snowmobile Oil Pump

A properly functioning oil pump is critical to keeping the engine adequately lubricated, especially with snowmobile engines that operate at high RPM. A low oil pressure gauge reading or an oil "warning" indicator light can be caused by low oil level, a bad sending unit or faulty oil pump. If the oil level in the crankcase is normal then the pump and sending unit can be checked simultaneously with an oil pressure test gauge. Before testing check the manufactures specifications for your snowmobile as oil pressure PSI specifications can vary between engines.

Things You'll Need

  • Oil pressure test gauge
  • Box-end wrenches
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Instructions

    • 1

      Disconnect the threaded fitting on the oil pressure sending unit tube from its attachment port (generally located on the top of the engine block) with the wrench. You will know you have the correct fitting as a few drops of oil will drip from the tube when it is disconnected.

    • 2

      Screw the fitting of the oil pressure test gauge into the sending unit attachment port on the engine block with your fingers and tighten with the wrench.

    • 3

      Start the engine and read the test gauge. A normal reading on the test gauge indicates the pump is functioning properly, which also indicates the sending unit is faulty. A low reading on the oil test gauge indicates the pump needs to be repaired or replaced.