Low or No Oil Pressure

The following can cause low or no oil pressure:

• Low oil level - fill to the full mark on the oil level indicator.
• Slow idle speed
• Incorrect or malfunctioning oil pressure switch - replace the oil pressure switch.
• Incorrect or malfunctioning oil pressure gage - replace the oil pressure gage.
• Improper oil viscosity or diluted oil
• Install oil of proper viscosity for expected temperature.
  • Install new oil if it is diluted.
  • The oil pump is worn or dirty - clean or replace the oil pump.
• The oil filter is plugged - replace the oil filter.
• The oil pickup screen is loose or plugged - replace the oil pickup screen.
• A hole in the oil pickup tube - replace the oil pickup tube.
• Excessive bearing clearance - replace the bearings.
• Cracked, porous, or plugged oil galleries - repair or replace the engine block.
• The gallery plugs are missing or improperly installed - install or repair as necessary.
• The pressure regulator valve is stuck.
  • Check the pressure regulator valve for sticking in the bore.
  • Check the bore for scoring and burrs.
• The camshaft is worn or poorly machined - replace the camshaft.
• Worn valve guides - repair as needed.