Doosan DL06 - Lubrication System

DL06K Interim Tire-4 Diesel Engine Maintenance of Major Components
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5.1.4 Diagnostics and troubleshooting
Complaints Possible causes Corrections
1. Engine overheating ● Lack of coolant ● Replenish coolant
● Radiator cap pressure valve
spring weakened
● Replace cap
● Fan belt loosened or broken ● Adjust or replace fan belt
● Fan belt fouled with oil ● Replace fan belt
● Thermostat inoperative ● Replace thermostat
● Water pump defective ● Repair or replace
● Restrictions in water
passages due to
deposit of scales
● Clean radiator and water
passages
● Injection timing
incorrect
● Check injection timing by
EDIA
● Restriction in radiator core ● Clean exterior of radiator
● Gases leaking into
water jacket due to
broken cylinder head gasket
● Replace cylinder head
gasket
2. Engine overcooling ● Thermostat inoperative ● Replace thermostat
● Ambient temperature too low ● Install radiator curtain
3. Lack of coolant ● Leakage of coolant
from the radiator
● Repair or replacement
● Loosened or
damaged coolant
connection on the
radiator
● Fasten the hose clamp or
replace the hose
● Loosened radiator
cap valve spring
● Replace the cap
● Leakage from the
coolant pump
● Repair or replacement
● Leakage from the
cylinder head gasket
● Replace the cylinder
head gasket
● Crack in the cylinder
head or the block
● Replace the cylinder
head or the block
4. Cooling system noisy ● Water pump bearing
defective
● Replace bearing
● Fan loosely fitted or bent ● Retighten or replace fan
● Fan out of balance ● Replace fan
● Fan belt defective ● Replace fan belt