- 45 - TECHNICAL INFORMATION Condition Causes Remedies 5) Engine noisy (1) Crankshaft (2) Con-rod and Con-rod bearing (3) Piston, piston pin & piston ring (4) Others For noises arise compositely such as rotating parts, lapping parts etc., there is necessity to search the cause of noises accurately. • As the wear of bearing or crankshaft progress, the oil clearances increase.
• Lopsided wear of crankshaft • Oil supply insufficient due to oil passage clogging • Stuck bearing Replace bearing & grind crankshaft Grind or replace Clean oil passage Replace bearing & Grind • Lopsided wear of con rod bearing • Lopsided wear of crank pin • Connecting rod distortion • Stuck bearing • Oil supply insufficiency as clogging at oil passage progresses Replace bearing Grind crankshaft Repair or replace Replace & grind crankshaft Clean oil passage • Piston clearance increase as the wear of piston and piston ring progresses • Wear of piston or piston pin • Piston stuck • Piston insertion poor • Piston ring damaged Replace piston & piston ring Replace Replace piston Replace piston Replace piston • Wear of crankshaft, thrust bearing • Camshaft end play increased • Idle gear end play increased • Timing gear backlash excessive • Valve clearance excessive • Abnormal wear of tappet, cam • Turbocharger inner part damaged Replace thrust bearing Replace thrust plate Replace thrust washer Repair or replace Adjust valve clearance Replace tappet, cam Repair or replace 6) Fuel Consumption Excessive • Injection timing incorrect • Fuel injection amount excessive Adjust Adjust injection pump