Doosan DE12T - Causes and Remedies

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7.3. Causes and Remedies

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Condition Causes Remedies

1) Starting difficult

ValveÕs poor shut, stem distortion Repair or replace

(1) Compression pressure

Valve spring damage Replace valve spring

Cylinder head gasketÕs 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 gasketÕs 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 pumpÕs 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 timerÕs function Repair or replace

insufficient

Nozzle infection pressure, infection Repair, replace

angle improper

Supply pumpÕs 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 pumpÕs function lowered Repair or replace

Water temp. regulatorÕs operation poor Replace

Valve clearance incorrect Adjust

Exhaust systemÕs resistance increased Clean or replace

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Doosan DE12T - Causes and Remedies

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