Preventive Maintenance
DETROIT DIESEL
air cleaner cups and center tubes every 8 hours or less
to the extent that they should be changed is based on
if operating conditions warrant. Wash the cups and
the fuel pressure at the cylinder head fuel inlet
elements in clean fuel oil and refill the cups to the
manifold and the inlet restriction at the fuel pump. In
level mark with the same grade of heavy duty oil as
a clean system, the maximum pump inlet restriction
used in the engine. The frequency of servicing may be
must not exceed 6 inches of mercury. At normal
varied to suit local dust conditions.
operating speeds (1800-2800 rpm), the fuel pressure is
45 to 70 psi (310 to 483 kPa). Change the fuel filter
elements whenever the inlet restriction (suction ) at the
It is recommended that the body and fixed element in
fuel pump reaches 12 inches of mercury at normal
the heavy-duty oil bath type air cleaner be serviced
operating speeds and whenever the fuel pressure at the
every 500 hours, 15,000 miles or as conditions warrant.
inlet manifold falls to 45 psi (310 kPa).
Clean or replace the element in the dry-type air
cleaner when the restriction indicator instrument
Item 10
indicates high restriction or when a water manometer
r e a d i n g at the air inlet housing indicates the
Remove the dirty oil and sludge from the oil bath-type
maximum allowable air inlet restriction (refer to the
Air Inlet Restriction chart in the Trouble Shooting
section). Refer to the instructions in the Air System
section for servicing the dry-type air cleaner.
Item 11
With the engine running, check for flow of air from
the air box drain tubes every 1,000 hours or 30,000
miles. If the tubes are clogged, remove, clean and
reinstall the tubes. The air box drain tubes should be
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
Clean the externally mounted crankcase breather
Item 9
assemblies every 1,000 hours or 30,000 miles. This
cleaning period may be reduced or lengthened
according to severity of service. Clean the internally
Item 10
Item 11
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