DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - LUBRICATION


CONDITION
  		 POSSIBLE CAUSES
  		 CORRECTION
  
OIL LEAKS
  		 1. Gaskets and O-Rings.
  		  
(a) Misaligned or damaged.
  		 (a) Replace as necessary.
  		  
(b) Loose fasteners, broken or porous metal parts.
  		 (b) Tighten fasteners, Repair or replace metal parts.
  		  
2. Crankshaft rear seal
  		 2. Replace as necessary (Refer to 9 - ENGINE/ENGINE BLOCK/CRANKSHAFT OIL SEAL - REAR - REMOVAL).
  		  
3. Crankshaft seal flange. Scratched, nicked or grooved.
  		 3. Polish or replace crankshaft.
  		  
4. Oil pan flange cracked.
  		 4. Replace oil pan (Refer to 9 - ENGINE/LUBRICATION/OIL PAN - REMOVAL).
  		  
5. Timing chain cover seal damaged.
  		 5. Re-seal timing cover.
  		  
6. Scratched or damaged vibration damper hub.
  		 6. Polish or replace damper.
  		  
OIL PRESSURE DROP
  		 1. Low oil level.
  		 1. Check and correct oil level.
  
2. Faulty oil pressure sending unit.
  		 2. Replace sending unit (Refer to 9 - ENGINE/LUBRICATION/OIL PRESSURE SENSOR/SWITCH - REMOVAL).
  		  
3. Low oil pressure.
  		 3. Check oil pump and bearing clearance.
  		  
4. Clogged oil filter.
  		 4. Replace oil filter (Refer to 9 - ENGINE/LUBRICATION/OIL FILTER - REMOVAL).
  		  
5. Worn oil pump.
  		 5. Replace oil pump (Refer to 9 - ENGINE/LUBRICATION/OIL PUMP - REMOVAL).
  		  
6. Thin or diluted oil.
  		 6. Change oil and filter.
  		  
7. Excessive bearing clearance.
  		 7. Replace as necessary.
  		  
8. Oil pump relief valve stuck.
  		 8. Replace oil pump (Refer to 9 - ENGINE/LUBRICATION/OIL PUMP - REMOVAL).
  		  
9. Oil pick up tube loose, damaged or clogged.
  		 9. Replace as necessary.
  		  
OIL PUMPING AT RINGS; SPARK PLUGS FOULING
  		 1. Worn or damaged rings.
  		 1. Hone cylinder bores and replace rings.
  
2. Carbon in oil ring slots.
  		 2. Replace rings (Refer to 9 - ENGINE/ENGINE BLOCK/PISTON RINGS - STANDARD PROCEDURE).
  		  
3. Incorrect ring size installed.
  		 3. Replace rings (Refer to 9 - ENGINE/ENGINE BLOCK/PISTON RINGS - STANDARD PROCEDURE).
  		  
4. Worn valve guides.
  		 4. Ream guides and replace valves (Refer to 9 - ENGINE/CYLINDER HEAD/INTAKE/EXHAUST VALVES & SEATS - STANDARD PROCEDURE).
  		  
5. Leaking valve guide seals.
  		 5. Replace valve guide seals.