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Engine Compression

  1. Prior to checking compression, be sure batteries are fully charged. DO NOT add oil to cylinders. Adding oil may cause hydrostatic lock and extensive engine damage.
  2. Start and warm engine to normal operating temperature. Turn ignition off. Remove air cleaner and/or intake opening cover. Disconnect injection pump cut-off solenoid.
  3. Remove all glow plugs and insert compression gauge in No. 1 cylinder glow plug hole. With ignition off, crank engine through at least 6 compression strokes. Note number of strokes required to obtain highest reading. Repeat check on each cylinder, cranking engine same number of compression strokes.
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