Section XXVI. MAINTENANCE OF ENGINE ASSEMBLY
GENERAL. The engine provides mechanical
power to drive generator. The diesel engine is a 12-
cylinder, V-type, turbocharged, aftercooled type, rated at
750 hp at 1800 rpm. The engine air intake system
consists of a precleaner with a replaceable filter. The
engine is equipped with monitoring and control devices,
lube oil cooler, and an independent governing system.
See figure 4-40.
WATER PUMP BELT. (See figure 4-41)
All generator sets with engine serial
numbers 10605201 and higher are equipped
with a new style water pump. Sets
equipped with the new pump require no
belt adjustments. The following procedure
applies to serial number 10605201.
Adjustment. (1) Remove screws and
lockwashers on front adjusting sheave.
Turn engine over manually to roll
belts outward on pulley as pulley
sheaves are turned in to obtain
desired belt tension. The engine can
be turned manually as follows:
Remove cotter pin from manual
engine crank bolt.
Push bolt toward generator to
Use a wrench to turn bolt.
Turn front and rear adjusting sheaves
position to obtain desired belt tension.
Lock front and rear adjusting sheaves
in position with lockwashers and
pressure of the index finger at the
center of the longest span of the belt.
Deflection should be approximately 1
inch (25 mm).
Replacement. (See figure 4-41. )
To replace water pump belts, remove
the screws and lockwashers which
secure the adjusting sheaves to the
Loosen the adjusting sheaves and
Always replace belts in complete sets to
prevent early failure and provide efficient
operation. Belt riding depth should not
vary over 1/16 inch (1.59 mm) on new belt
Belts should not bottom on pulley
grooves and should not protrude over
3/32 inch (2. 4 mm) above top of
edge of groove.
Install new water pump belts to
pulleys and secure in position with the
adjusting sheaves, lockwashers, and
Adjust the water pump belt tension as
described in paragraph a, above.
SERVICING DCA WATER FILTERS. (See
figure 4-40. )
New engines are shipped with a DCA pre-
charge element. At first oil change (see
element with normal DCA Service Element.
Replace filter element at each oil change. If
coolant is drained and the coolant is
replaced, install a DCA pre-charge element
and repeat cycle. To test coolant corrosion
inhibitor use Fleetguard DCA, Part Number
3300846-S, or Cummins Coolant, Part
Number 3375 208, Test Kit.