EPA07/10 DD PLATFORM WORKSHOP MANUAL - ENGINE
39.1 DESCRIPTION AND OPERATION OF BELT DRIVE TENSIONER AND
RELATED PARTS
The engine uses two poly-V-belts. Since this type of belt is very
fl
exible, a number of major
assemblies can be driven by one poly-V-belt. The alternator, refrigerant compressor, and coolant
pump are driven by one eight-ribbed poly-V-belt. The fan clutch and the engine fan are driven by
one ten-ribbed poly-V-belt.
The belt tensioners are
fi
rmly bolted onto the accessory bracket. The tensioning arms with
tensioner pulleys are turned counterclockwise by the force of the springs to provide the required
tension in the belts.
All information subject to change without notice.
DDC-SVC-MAN-0081 2010
Copyright © 2010 DETROIT DIESEL CORPORATION
39-3
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