DL06 Diesel Engine Technical Information 50 Condition Causes Remedies 5) Engine noisy (1) Crankshaft (2) Connecting-rod and connecting-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. z As the wear of bearing or crankshaft progress, the oil clearances increase.
z Lopsided wear of crankshaft z Oil supply insufficient due to oil passage clogging z Stuck bearing Replace bearing & grind crankshaft Grind or replace Clean oil passage Replace bearing & grind z Lopsided wear of con rod bearing z Lopsided wear of crank pin z Connecting rod distortion z Stuck bearing z Oil supply insufficiency as clogging at oil passage progresses Replace bearing Grind crankshaft Repair or replace Replace & grind crankshaft Clean oil passage z Piston clearance increase as the wear of piston and piston ring progresses z Wear of piston or piston pin z Piston stuck z Piston insertion poor z Piston ring damaged Replace piston & piston ring Replace Replace piston Replace piston Replace piston z Wear of crankshaft, thrust bearing z Camshaft end play increased z Idle gear end play increased z Timing gear backlash excessive z Valve clearance excessive z Abnormal wear of tappet, cam z 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 z Injection timing incorrect z Fuel injection amount excessive z Tire air pressure incorrect Use of low speed gear is too frequent Check Adjust