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TECHNICAL INFORMATION
Condition
Causes
Remedies
5) Engine noisy
For noises arise compositely such
as rotating parts, lapping parts etc.,
there is necessity to search the
cause of noises accurately.
(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
Replace piston & piston ring
piston ring
wear of piston and piston ring
progresses
•
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
•
Turbocharger inner part damaged
Repair or replace
6) Fuel Consumption
•
Injection timing incorrect
Adjust
Excessive
•
Fuel injection amount excessive
Adjust injection pump
Summary of Contents for DE12T
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