15.1
Preventive Maintenance
DETROIT DIESEL 53
cleaned periodically even though a clogged condition is not
apparent. If the engine is equipped with an air box drain tank,
drain the sediment periodically. If the engine is equipped with
an air box drain check valve, replace the valve every 500
hours or 15,000 miles.
Item 12
Remove the externally mounted crankcase breather
assembly every 1,000 hours or 30,000 miles and wash the
steel mesh pad in clean fuel oil. This cleaning period may be
reduced or lengthened according to severity of service (refer
Clean the internally mounted breather pads at time of engine
overhaul, or sooner if excessive crankcase
pressure is observed.
Item 12
Clean the ', e :her cap, mounted on the valve rocker cover, in
clean fuel oil every time the engine oil is changed (refer to
Item 13
Inspect the blower screen and gasket assembly every 1,000
hours or 30,000 miles and, if necessary, clean the screen in
fuel oil and dry it with compressed air. Reinstall the screen and
gasket assembly with the
screen side of the assembly toward the blower.
Item 14
The electrical starting motor is lubricated at' the time of original
assembly. Oil can be added to the oil wicks, which project
through each bushing and contact the armature shaft, by
removing the pipe plugs on the outside of the motor. The
wicks should be lubricated whenever the starting motor is taken
Item 13
off the engine or disassembled.
The Sprag overrunning clutch drive mechanism should be
lubricated with a few drops of light engine oil whenever the
starting motor is overhauled.
Item 15
Lubricate the battery-charging generator (alternator) bearings
or bushings with 5 or 6 drops of engine oil at the hinge cap
oiler every 200 hours or 6,000 miles.
On early generators equipped with grease cups, turn the cups
down one full turn every 100 hours or 3,000 miles of
operation. Keep the grease cups filled with
Item 14
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