Inspect the exterior of the radiator core every 1,000 hours or
30,000 miles and, if necessary, clean it with a quality grease
solvent 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 areas.
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 plug.
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. 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