Doosan GL08K - Page 49

Technical Information
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Condition Causes Remedies
1) Starting difficult
(1) Compression pressure  Valve's poor shut, stem distortion
 Valve spring damage
 Cylinder head gasket's leak
 Wear of piston, piston ring or liner
Repair or replace
Replace valve spring
Replace gasket
Adjust
2) Idle operation abnormal
 Ignition timing incorrect Adjust
3) Engine output insufficient
(1) Continuous output
Insufficient
 Valve clearance incorrect
 Valve tightness poor
 Cylinder head gasket's leak
 Wear, stick, damage of piston ring
 Ignition timing incorrect
 Damage of spark plug & ignition coil
 Air suction amount insufficient
 Turbocharger poor
Adjust
Repair
Replace gasket
Replace piston ring
Adjust
Adjust or replace
Clean or replace air cleaner
Repair or replace
(2) Output insufficient when in
acceleration
 Compression pressure insufficient
 Ignition timing incorrect
 Damage of spark plug & ignition coil
 Air intake amount insufficient
Disassemble engine
Adjust
Repair or replace
Clean or replace air cleaner
4) Overheating  Engine oil insufficient or poor
 Cooling water insufficient
 Fan belt loosened, worn, damaged
 Cooling water pump's function lowered
 Water temp. regulator's operation poor
 Valve clearance incorrect
 Exhaust system's resistance increased
Replenish or replace
Replenish or replace
Adjust or replace
Repair or replace
Replace
Adjust
Clean or replace
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
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
(2) Con rod and Con rod
bearing
 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