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Condition
Causes
Remedies
1) Starting difficult
•
Valve’s poor shut, stem distortion
Repair or replace
(1) Compression pressure
•
Valve spring damage
Replace valve spring
•
Cylinder head gasket’s leak
Replace gasket
•
Wear of piston, piston ring or liner
Adjust
2) Idle operation abnormal
•
Injection timing incorrect
Adjust
•
Air mixing at injection pump
Remove air
3) Engine output insufficient
•
Valve clearance incorrect
Adjust
(1) Continuous output
•
Valve tightness poor
Repair
insufficient
•
Cylinder head gasket’s leak
Replace gasket
•
Wear, stick, damage of piston ring
Replace piston ring
•
Injection timing incorrect
Adjust
•
Fuel injection amount insufficient
Adjust injection
pump
•
Nozzle injection pressure
Adjust or replace
improper or stuck
•
Supply pump’s function lowered
Repair or replace
•
Fuel pipe system clogged
Repair
•
Air suction amount insufficient
Clean or replace air
cleaner
•
Supercharger poor
Repair or replace
(2) Output insufficient
•
Compression pressure
Disassemble engine
when in acceleration
insufficient
•
Injection timing incorrect
Adjust
•
Fuel injection amount insufficient
Adjust injection
pump
•
Injection pump timer’s function
Repair or replace
insufficient
•
Nozzle infection pressure, infection
Repair, replace
angle improper
•
Supply pump’s function lowered
Repair or replace
•
Air intake amount insufficient
Clean or replace air
cleaner
4) Overheating
•
Engine oil insufficient or poor
Replenish or replace
•
Cooling water insufficient
Replenish or replace
•
Fan belt loosened, worn, damaged
Adjust or replace
•
Cooling water pump’s function lowered
Repair or replace
•
Water temp. regulator’s operation poor
Replace
•
Valve clearance incorrect
Adjust
•
Exhaust system’s resistance increased
Clean or replace
7.3. Causes and Remedies