Daewoo DE12T - Disassembly and Reassembly of Major Components; Disassembly Procedures

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