Daewoo DE12 - 2.2. Diagnostics and Troubleshooting

2.2. Diagnostics and trouble shooting for the engine
2.2.1. Diagnostics
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1. Engine won’t start
Starter does not turn Starter turns but engine does not start
Check battery fluid and specific gravity Engine Fuel
Too low Check air cleaner Check fuel level
Replenish or recharge
Check cable connections
Check starter s/w
Check starter relay
Check magnetic s/w
Disassemble and check starter motor
Disassemble and check injection pump
Normal
Fouled
Replace or clean element
Check compression pressure
Check other parts
Check cylinder head gasket
Overhaul the engine
(valve assembly, cylinder
liner, piston, etc.)
Check fuel feed pump for function
Check feed pump valve and strainer Air in the fuel
Retighten the joint and/or replace gasket
Air bleeding
Continuous entry of air in fuel system
Disassemble and check feed pump
Dirty element and/or overflow valve faulty
Check fuel filter
Replace
Normal
Too low
Retighten or replace
Check valve clearance
Normal
No fuel
Replenish
Check fuel injection
Normal
AdjustNormal
Repair or replaceNormal
No fuel injection
Air bleeding and re-start
Check injection timing
Check injection nozzle(injection
pressure, injection condition, etc.)
Disassemble and check
injection pump
Normal
AdjustNormal
ReplaceNormal
Clean or replaceNormal
Normal
Replenish or recharge Normal
Replenish or recharge Normal
ReplaceNormal
Replenish or recharge Normal