Engine Oiling System: Notes

1972 GMC C25/C2500 Pickup 4.1L Eng VIN L, Automatic Trans, Trans Mfr CD PowerglideSECTION Notes

Oil pump mounted on right lower flange of crankcase in oil pan draws oil from pan through a floating screen and delivers oil through passage in pump body and crankcase to full flow filter on right side of engine. Oil flows from filter to main oil gallery in block and is distributed as detailed below. Pressure regulator valve is located in oil pump and a by-pass valve is located in filter base.

RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
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  • β€’ You are not confident in the next step or safety outcome.