DV11
Operation and Maintenance
50
Technical Information
Printed in Mar. 2005 PS-MMA0608-E1A
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.
z As the wear of bearing or
crankshaft progress, the oil
clearances increase.
Replace bearing &
grind crankshaft
z Lopsided wear of crankshaft Grind or replace
z Oil supply insufficient due to
oil passage clogging
Clean oil passage
(1) Crankshaft
z Stuck bearing Replace bearing &
grind
z Lopsided wear of con rod
bearing
Replace bearing
z Lopsided wear of crank pin Grind crankshaft
z Connecting rod distortion Repair or replace
z Stuck bearing Replace &
grind crankshaft
(2) Connecting-rod and
connecting-rod bearing
z Oil supply insufficiency as
clogging at oil passage
progresses
Clean oil passage
z Piston clearance increase
as the wear of piston and
piston ring progresses
Replace piston &
piston ring
z Wear of piston or piston pin Replace
z Piston stuck Replace piston
z Piston insertion poor Replace piston
(3) Piston, piston pin &
piston ring
z Piston ring damaged Replace piston
z Wear of crankshaft, thrust
bearing
Replace thrust bearing
z Camshaft end play
increased
Replace thrust plate
z Idle gear end play increased Replace thrust washer
z Timing gear backlash
excessive
Repair or replace
z Valve clearance excessive Adjust valve clearance
z Abnormal wear of tappet,
cam
Replace tappet, cam
(4) Others
z Turbocharger inner part
damaged
Repair or replace
z Injection timing incorrect Check
6) Fuel consumption
excessive
z Fuel injection amount
excessive
z Tire air pressure incorrect
Use of low speed gear is
too frequent
Adjust
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