DETROIT DIESEL
53
Preventive Maintenance 15.1
Item 8
Keep the fuel tank filled to reduce condensation to a minimum. Select the proper grade of fuel in accordance with the
Diesel Fuel Oil Specifications in Section 13.3. Open the drain at the bottom of the fuel tank every 500 hours or 15,000
miles to drain off any water or sediment.
Item 9
Install new elements every 300 hours or 9,000 miles or
when plugging is indicated.
A method of determining when elements are plugged 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. 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.
Item 10
Remove the dirty oil and sludge from the oil bath type air
cleaner cups and center tubes every 8 hours (every 6,000
miles for highway vehicle engines), 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
Item 9
grade and viscosity heavy- duty oil as used in the engine.
The frequency of servicing may be 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 (Section
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
Item 10
Item 11
April, 1994
SEC. 15.1
Page 5
