Maintenance Section
152
When Required
You must read and understand the warnings and instructions contained in the Safety section of this manual,
before performing any operation or maintenance procedures.
Engine Valve Lash (Diesel E/G
Only) - Check, Adjust
NOTICE
The valve clearances are to be adjusted at the times
of the following situations.
z When the engine is overhauled and the cylinder
heads are disassembled.
z When severe noise comes from valve train.
z When the engine is not normally operated even
though there is no trouble in the fuel system.
WARNING
To prevent possible injury when adjusting diesel
engines, Do not use the starter motor to turn the
flywheel.
Hot engine components can cause burns. Allow
additional time for the engine to cool before
measuring valve clearance.
NOTICE
Measure the valve lash with the engine stopped. To
obtain an accurate measurement, allow at least 20
minutes for the engine cylinder head and block to
cool.
Set the clearance to the nominal appropriate
clearance given in the "Valve Clearance Setting"
chart shown below.
Valve Clearances
Engine Valve Clearance
DB58S & D439E
Exhaust
Valves
.40 mm (.16 in)
Intake Valves .40 mm (.16 in)
Refer to the "Service Manual" for the complete valve
adjustment procedure.
NOTE: In case of LP Engine, no valve adjustment
is necessary.
Priming the Fuel System (Diesel
Engine Only)
Bleeding the Fuel System
After changing the fuel filter, or after having serviced
any part of the fuel system, make sure that the air is
bled from the system.
<DB58S>
1. Release the feed pump cap (1) on the injection
pump.
2. Release an air bleed nut (2) on the injection
pump.
3. Operate feed pump vertical until completely
remove an air.
4. Tighten air bleed nut (2).
5. Make sure to check leakage of injection pump &
filter after operating feed pump many times.
<D439E>
1. Operate priming pump for five minutes.
2. Make sure to check leakage of injection pump
and filter after operating feed pump many times.
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