Daedong DSC48, Workshop Manual

Page: 98 / 290

2
-22 Apr. 2007
DSC48
Symptom Probable cause Solution
Insuf fi cient Output • Incorrect injection timing
• Engine's moving parts seem to be seizing
• Uneven
fuel injection
• Insuf fi cient nozzle injection
• Compression leak
Adjust
Repair or replace
Repair or replace injection pump
Repair or replace nozzle
Replace head gasket, tighten cylinder
head bolt and nut, replace glow plug
and nozzle holder
Excessive Engine Oil
Consumption • Piston ring's gap facing the same direction
• Worn or stuck oil ring
• Worn piston ring groove
• Worn valve stem and guide
• Worn crankshaft bearing and crankpin bearing Shift ring gap direction
Replace
Replace piston
Replace
Replace
Fuel Mixed into En-
gine Oil • Worn injection pump plunger
• Broken fuel delivery pump Replace pump element or pump
Replace
Water Mixed into
Engine Oil • Faulty head gasket
• Cracked or damaged cylinder block or cylinder
head
Replace
Replace
Low Oil Pressure • Insuf fi cient engine oil
• Oil fi lter clogged
• Oil fi lter cartridge clogged
• Relief valve stuck with dirt
• Weak or broken relief valve spring
• Excessive oil clearance of crankshaft bearing
• Excessive oil clearance of crank pin bearing
• Excessive oil clearance of rocker arm bushings
• Oil passage clogged
• Improper type of oil
Replenish oil
Clean
Replace
Clean
Replace
Replace
Replace
Replace
Clean
Use the speci
fi ed type of oil
High Oil Pressure • Defective oil pump
• Improper type of oil Repair or replace
Use the speci
fi ed type of oil
Engine overheating • Defective relief valve
• Insuf
fi cient engine oil
• Broken or improperly tensioned fan belt
• Insuf
fi cient cooling water
• Radiator net or fi n clogged with dirt
• Corroded radiator inner part
• Cooling
water fl ow route corroded
• Defective radiator cap
• Damaged water pipe
• Defective water pump
• Running at overload
• Defective
head gasket
• Incorrect injection timing
• Unsuitable fuel used
Replace
Replenish
Replace or adjust
Replenish
Clean
Clean or replace
Clean or replace
Replace
Replace
Replace
Lessen load
Replace
Adjust
Use the speci
fi ed fuel
Battery Quickly Dis-
charge • Insuf fi cient battery electrolyte
• Fan belt slips
• Open circuit
• Defective regulator
• Defective battery
Replenish distilled water and recharge
Adjust belt tension or replace
Connect
Replace
Replace