Daewoo DE12 - 3. Disassembly and Reassembly of Major Components

Complaint Cause Correction
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1) Difficulty in engine
starting
(1) Trouble in starter
(2) Trouble in fuel system
(3) Lack of compression
pressure
2) Rough engine idling
3) Lack of engine power
(1) Engine continues to
lack power
(2) Engine lacks power on
acceleration
4) Engine overheating
(See <2.2.1>)
(See <Section 4.3 Fuel system>)
Valves holding open, skewed valve stem
Valve springs damaged
Leaky cylinder head gasket
Worn pistons, piston ring, or liner
Wrong injection timing
Air in injection pump
Valve clearance incorrect
Valve poorly seated
Leaky cylinder head gasket
Piston rings worn, sticking, or
damaged
Injection timing incorrect
Volume of fuel delivery insufficient
Nozzle injection pressure incorrect
or nozzles seized
Feed pump faulty
Restrictions in fuel pipes
Volume of intake air insufficient
Compression pressure insufficient
Injection timing incorrect
Volume of fuel delivery insufficient
Injection pump timer faulty
Nozzle injection pressure or spray
angle incorrect
Feed pump faulty
Volume of intake air insufficient
Lack of engine oil or poor oil
Lack of coolant
Fan belts slipping, worn or damaged
Water pump faulty
Thermostat inoperative
Valve clearance incorrect
Back pressure in exhaust line
7
6
5
4
3
2
1
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
2
1
4
3
2
1
Check valve and valve seat,
then repair or replace
Replace valve springs
Replace gasket
Replace
Adjust
Air bleeding
Adjust
Repair
Replace gasket
Replace piston rings
Adjust
Adjust injection pump
Adjust or replace nozzles
Repair or replace
Repair
Clean or replace air cleaner
Overhaul engine
Adjust
Adjust injection pump
Repair or replace
Repair or replace
Repair or replace
Clean or replace air cleaner
Replenish or replace
Replenish or replace
Adjust or replace
Repair or replace
Replace
Adjust
Clean or replace
2.2.2. Trouble shooting