Doosan DE12T - Page 60

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Condition Cause Remedies

5) Engine noisy For noises arise compositely such asrota

ting parts, lapping parts etc., there is nec

essity to search the cause of noises accu

rately.

(1) Crankshaft

As the wear of bearing or crankshaft Replace bearing &

progress, the oil clearances increase. grind crankshaft

Lopsided wear of crankshaft Grind or replace

Oil supply insufficient due to oil Clean oil passage

passage clogging

Stuck bearing Replace bearing &

Grind

(2) Con rod and

Lopsided wear of con rod bearing Replace bearing

Con rod bearing

Lopsided wear of crank pin Grind crankshaft

Connecting rod distortion Repair or replace

Stuck bearing Replace &

grind crankshaft

Oil supply insufficiency as clogging Clean oil passage

at oil passage progresses

(3) Piston, piston pin &

Piston clearance increase as the wear Replace piston &

piston ring of piston and piston ring progresses piston ring

Wear of piston or piston pin Replace

Piston stuck Replace piston

Piston insertion poor Replace piston

Piston ring damaged Replace piston

(4) Others

Wear of crankshaft, thrust bearing Replace thrust

bearing

Camshaft end play increased Replace thrust plate

Idle gear end play increased Replace thrust

washer

Timing gear backlash excessive Repair or replace

Valve clearance excessive Adjust valve

clearance

Abnormal wear of tappet, cam Replace tappet, cam

Supercharger inner part damaged Repair or replace

6) Fuel Consumption

Injection timing incorrect Adjust

Exttive

Fuel injection amount excessive Adjust injection

pump

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