DETROIT DIESEL
Preventive Maintenance
to the extent that they should be changed is based on the fuel
pressure at the cylinder head fuel inlet manifold and the inlet
restriction at the fuel pump. In a clean system, the maximum
pump inlet restriction must not exceed 6 inches of mercury. At
normal 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 fuel pump reaches
12 inches of mercury at normal
operating speeds and whenever the fuel pressure at the inlet
manifold falls to 45 psi (310 kPa).
Item 10
Remove the dirty oil and sludge from the oil bath-type air cleaner
cups and center tubes every 8 hours or less if operating
conditions warrant. Wash the cups and elements in clean fuel oil
and refill the cups to the level mark with the same grade of heavy
duty oil as used in the engine. The frequency of servicing may be
Item 9
varied to suit local dust conditions.
It is recommended that the body and fixed element in the heavy-
duty oil bath type air cleaner be serviced every 500 hours, 15,000
miles or as conditions warrant.
Clean or replace the element in the dry-type air cleaner when the
restriction indicator instrument indicates high restriction or when a
water manometer reading at the air inlet housing indicates the
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
Item 10
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 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 11
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