Low Oil Pressure

^ Slow idle speed.

^ Incorrect or malfunctioning oil pressure switch.

^ Incorrect or malfunctioning oil pressure gage. Replace with proper gage.

^ Improper oil viscosity or diluted oil. Install oil of proper viscosity for expected temperature, or install new oil if diluted with moisture or unburned fuel mixtures.

^ Oil pump worn or dirty.

^ Plugged oil filter.

^ Oil pickup screen loose or plugged.

^ Hole in oil pickup tube.

^ Excessive bearing clearance. Replace if necessary.

^ Cracked, porous or plugged oil galleys. Repair or replace block.

^ Galley plugs missing or misinstalled. Install plugs, or repair as necessary.