Lubrication system malfunctions (Diesel engines / Cooling and lubrication system / Ford Escort 4 1986-1990)

CAUSE	ELIMINATION METHOD
The oil pressure warning light does not light after the ignition is switched on
Faulty oil pressure sensor	To check the sensor, turn on the ignition, remove the wire from the sensor and short it to ground. If the warning light comes on, replace the oil pressure sensor
Breakage of the wire to the oil pressure sensor, oxidation of the contacts	Eliminated by checking the health of the wires and stripping the contacts
Light bulb failure	Fixed by replacing the light bulb
Oil pressure warning light does not go out when engine speed increases
High oil temperature	When the engine speed increases, the control lamp should go out
The oil pressure warning light does not go out after starting the engine
Faulty oil pressure sensor	Eliminated by checking and replacing the oil pressure sensor
Low oil pressure, which may be due to a low oil level in the crankcase	Add oil to crankcase
The wire connecting the oil pressure sensor and the control light closes to ground	To check, turn on the ignition and remove the wire from the oil pressure sensor, if the light goes out, find the place where the wire is shorted to ground and isolate it
Reduced oil pressure throughout the entire engine speed range
Low oil level in crankcase	Eliminated by adding oil to normal level
Clogged oil filter	Eliminated by cleaning the mesh and oil pickup pipe
Bad oil pickup pipe	Fix the oil pickup pipe
Wear of oil pump parts	Remove the oil pump and check its condition
Increased clearance in the main bearings of the crankshaft	In this case, disassemble and repair the engine
Low oil pressure at idle
Reducing valve stuck open	Remove the valve, clean and check its operation
Increased oil pressure at engine speeds over 2000 rpm
Reducing valve does not open	Remove the valve, clean and check its operation

Lubrication system malfunctions

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