Inspect the exterior of the radiator core every 1.,000
hours or 30,000 miles and, if necessary, clean it with a
quality grease solvents such as Oleum and compressed
air. Do not use fuel oil, kerosene or gasoline. It may be
necessary to clean the radiator more frequently if the
engine is being operated in extremely dusty or dirty
Every 500 hours drain the water from the heat
exchanger raw water inlet and outlet tubes. Then
remove the zinc electrodes from the inlet side of the
raw water pump and the heat exchanger. Clean the
electrodes with a wire brush or, if worn excessively,
replace with new electrodes. To determine the condition
of a used electrode, strike it sharply against a hard
surface; a weakened electrode will break.
Drain the cooling system, disconnect the raw water
pipes at the outlet side of the heat exchanger and
remove the retaining cover every 1,000 hours and
inspect the heat exchanger core. If a considerable
amount of scale or deposits are present, contact an
authorized Detroit Diesel Allison Service Outlet.
Check the prime on the raw water pump; the engine
should not be operated with a dry pump. Prime the
pump, if necessary, by removing the pipe plug provided
in the pump inlet elbow and adding water. Reinstall the
minimum. Select the proper grade of fuel in accordance
with the Diesel Fuel Oil Specifications.
Open the drain at the bottom of the fuel tank every 500
hours or 15,000 miles to drain off any water or sediment.
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.