Doosan D50S-5 Operation & Maintenance Manual page 153

heads are disassembled. heads are disassembled.
When severe noise comes from valve train. When severe noise comes from valve train.
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When the engine is not normally operated even When the engine is not normally operated even
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though there is no trouble in though there is no trouble in the fuel system.
To prevent possible injury w To prevent possible injury when adjusting diesel
engines, Do not use the starter motor to turn the engines, Do not use the starter motor to turn the
flywheel. flywheel.
Hot engine components can cause burns. Allow Hot engine components can cause burns. Allow
additional time for the engine to cool before additional time for the engine to cool before
measuring valve clearance. measuring valve clearance.
Measure the valve lash with the engine stopped. To Measure the valve lash with the engine stopped. To
obtain an accurate measurement, allow at least 20 obtain an accurate measurement, allow at least 20
minutes for the engine cylinder head and block to minutes for the engine cylinder head and block to
cool. cool.
Set the clearance to the nominal appropriate Set the clearance to the nominal appropriate
clearance given in the "Valve Clearance Setting" clearance given in the "Valve Clearance Setting"
chart shown below. chart shown below.
Engine Engine
DB58S & D439E DB58S & D439E
Refer to the "Service M Refer to the "Service Manual" for the complete valve
adjustment procedure. adjustment procedure.
NOTE: In case of LP Engine, no valve adjustment NOTE: In case of LP Engine, no valve adjustment
is necessary. is necessary.
Draining the Water From the Fuel Filter Draining the Water From the Fuel Filter
Diesel Engine Only Diesel Engine Only
the fuel system.
WARNING WARNING
hen adjusting diesel
NOTICE NOTICE
Valve Clearances Valve Clearances
Valve Valve Clearance Clearance
Exhaust Exhaust
.40 mm (.16 in) .40 mm (.16 in)
Valves Valves
In Inta take ke Va Valv lves es .4 .40 0 mm mm (. (.16
anual" for the complete valve
1. 1. Release the feed pump cap (1) on the injection Release the feed pump cap (1) on the injection
pump. pump.
2. 2. Release an air bleed nut (2) on the injection Release an air bleed nut (2) on the injection
pump. pump.
3. 3. Operate feed pump vertical until completely Operate feed pump vertical until completely
remove an air. remove an air.
4. 4. Tighten air bleed nut (2). Tighten air bleed nut (2).
5. 5. Make sure to check leakage of injection pump & Make sure to check leakage of injection pump &
filter after operating feed pump many times. filter after operating feed pump many times.
16 in in) )
1. 1. Operate priming pump for five min Operate priming pump for five minutes.
2. 2. Make sure to check leakage of injection pump Make sure to check leakage of injection pump
and filter after operating feed pump many times. and filter after operating feed pump m
152 152
Test Fuel System for Test Fuel System for Leaks (LP
Engine Only) Engine Only)
<DB58S> <DB58S>
<D439E> <D439E>
utes.
any times.
Maintenance Section Maintenance Section
Leaks (LP
Check Check
Points Points