wear and chafing. If any indication of wear is evident,
replace the oil lines and correct the cause.
When the engine is equipped with a turbocharger,
disconnect the oil inlet line at the turbocharger and
pour approximately four ounces of oil in the oil inlet,
then reconnect the oil line.
If the engine is equipped with a governor oil filter,
change the element every 1,000 hours.
Check the coolant level daily and maintain it near the
top of the heat exchanger tank or radiator upper tank.
Clean the cooling system every 1,000 hours or 30,000
miles (48 280 km) using a good radiator cleaning
compound in accordance with the instructions on the
container. After the cleaning operation, rinse the
cooling system thoroughly with fresh water. Then fill
the system with soft water, adding a good grade of
rust inhibitor or a high boiling point type antifreeze
(refer to Engine Coolant). With the use of a proper
antifreeze or rust inhibitor, this interval. may be
lengthened until, normally, this cleaning is done only
in the spring or fall. The length of this interval will,
however, depend upon an inspection for rust or other
hours or 30,000 miles (48 280 km) and, if necessary,
deposits on the internal walls of the cooling system.
clean it with a quality grease solvent such as mineral
When a thorough cleaning of the cooling system is
spirits and dry it with compressed air. Do not use fuel
required, it should be reverse flushed.
oil, kerosene or gasoline. It may be necessary to clean
the radiator more frequently if the engine is being
The coolant circulated through the intercoolers on a
operated in dusty or dirty areas.
turbocharged intercooler engine is protected by a 20
mesh cone-shaped water filter (screen). The filter is
located at the water connection in the water pump-to-
engine oil cooler tube. The filter should be inspected
for damage or clogging when the cooling system is
Every 500 hours, d r a i n the water from the heat
cleaned. Disconnect the flexible water hose at the
exchanger raw water inlet and outlet tubes. Then
water connection and remove and clean the filter. If
remove the zinc electrodes from the inlet side of the
necessary, replace the filter. Reinstall the water filter
raw water pump and the heat exchanger. Clean the
(screen) in the water connection.
electrodes with a wire brush or, if worn excessively,
replace w i t h new electrodes. To determine the
If the cooling system is protected by a coolant filter
condition of a used electrode, strike it sharply against
and conditioner, the filter element should be changed
a hard surface; a weakened electrode will break.
every 500 hours or 15,000 miles (24 140 km).
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
Inspect all of the cooling system hoses at least once
amount of scale or deposits are present, contact an
every 500 hours or 15,000 miles (24 140 km) for signs
authorized Detroit Diesel Allison Service Outlet.
Inspect the exterior of the radiator core every 1,000
Check the prime on the raw water pump; the engine