POSSIBLE CAUSES 1. Insufficient oil supply 2. Low oil pressure 3. Thin or diluted oil 4. Excessive main bearing clearance 5. Excessive end play 6. Crankshaft main journal out of round or worn 7. Loose flywheel or torque converter CORRECTION 1. Check engine oil level. 2. Check engine oil level. If ok, Perform oil pressure… Read More »
POSSIBLE CAUSES 1. Insufficient oil supply 2. Low oil pressure 3. Thin or diluted oil 4. Excessive connecting rod bearing clearance 5. Connecting rod journal out of round 6. Misaligned connecting rods CORRECTION 1. Check engine oil level 2. Check engine oil level. If ok, Perform oil pressure test. (Refer to 9 – ENGINE/LUBRICATION –… Read More »
POSSIBLE CAUSES 1. High or low oil level in crankcase 2. Thin or diluted oil 3. Low oil pressure 4. Dirt in tappets/lash adjusters 5. Bent push rod(s) 6. Worn rocker arms 7. Worn tappets/lash adjusters 8. Worn valve guides 9. Excessive runout of valve seats or valve faces CORRECTION 1. Check for correct oil… Read More »
POSSIBLE CAUSES 1. Worn or damaged rings. 2. Carbon in oil ring slots. 3. Incorrect ring size installed. 4. Worn valve guides. 5. Leaking intake gasket. 6. Leaking valve guide seals. CORRECTION 1. Hone cylinder bores and replace rings. 2. Replace rings. 3. Replace rings. 4. Ream guides and replace valves. 5. Replace intake gaskets.… Read More »
POSSIBLE CAUSES 1. Low oil level. 2. Faulty oil pressure sending unit. 3. Low oil pressure. 4. Clogged oil filter. 5. Worn oil pump. 6. Thin or diluted oil. 7. Excessive bearing clearance. 8. Oil pump relief valve stuck. 9. Oil pickup tube loose or damaged. CORRECTION 1. Check and correct oil level. 2. Replace… Read More »
POSSIBLE CAUSES 1. Gaskets and O-Rings. (a) Misaligned or damaged. (b) Loose fasteners, broken or porous metal parts. 2. Crankshaft rear seal 3. Crankshaft sear flange. Scratched, nicked or grooved. 4. Oil pan flange cracked. 5. Front cover seal, damaged or misaligned. 6. Scratched or damaged vibration damper hub. 7. Crankshaft Rear Flange Microporosity CORRECTION… Read More »
The combustion pressure leakage test provides an accurate means for determining engine condition. Combustion pressure leakage testing will detect: • Exhaust and intake valve leaks (improper seating) . • Leaks between adjacent cylinders or into water jacket. • Any causes for combustion/compression pressure loss. 1. Check the coolant level and fill as required. DO NOT… Read More »
The results of a cylinder compression pressure test can be utilized to diagnose several engine malfunctions. Ensure the battery is completely charged and the engine starter motor is in good operating condition. Otherwise the indicated compression pressures may not be valid for diagnosis purposes. 1. Clean the spark plug recesses with compressed air. 2. Remove… Read More »
POSSIBLE CAUSES 1. Insufficient oil supply. 2. Low oil pressure. 3. Thin or diluted oil. 4. Excessive bearing clearance. 5. Excessive end play. 6. Crankshaft journal out-of round. 7. Loose flywheel or torque converter. CORRECTIONS 1. Refer to LUBRICATION & MAINTENANCE/FLUID TYPES-SPECIFICATIONS. 2. Check oil pump, if OK, check rod and main bearings for excessive… Read More »
POSSIBLE CAUSES 1. Insufficient oil supply. 2. Low oil pressure. 3. Thin or diluted oil. 4. Excessive bearing clearance. 5. Connecting rod journal out-of-round. 6. Misaligned connecting rods. CORRECTIONS 1. Refer to LUBRICATION & MAINTENANCE/FLUID TYPES – SPECIFICATIONS. 2. Check oil pump, if OK, check rod and main bearings for excessive wear. 3. Change oil… Read More »