Drive Belt Replacement And Tensioning; General Information - Mack MP7 Service Manual

103
Figure 103 — Connecting AFI Check Valve Assembly
14. Install P-clamp bolts to secure the AFI
harness and fuel line.
15. Connect all previously disconnected cables
to the ground (negative) battery terminals.
16. Using VCADS/Tech Tool, reset the AFI
adaptive factor, clear codes and test the
system for proper operation.
DRIVE BELT REPLACEMENT
AND TENSIONING
[216 AA]

General Information

The service life of the poly-V belts is considerably
improved over other systems and allows the use
of higher horsepower cooling fans. All MP7
engines are equipped with poly-V belt systems.
MP7 Engine
In the dual poly-V drive belt arrangement, the fan
drive and coolant pump are driven directly from
the crankshaft pulley by a 10-rib poly-V belt. The
alternator and the air conditioning (A/C)
refrigerant compressor (if equipped) are driven off
the crankshaft pulley by a six-rib poly-V belt
(Figure 104). Two automatic tensioners are used,
one for the fan drive and coolant pump and one
for the accessory drive. An extra idler is provided
for the high mount fan drive.
MAINTENANCE
104
1. Conventional Chassis
The tensioner for the crankshaft-to-fan drive hub
and coolant pump is mounted to the front engine
support. This tensioner spring loads in a
counterclockwise direction to apply load to the
belt. The accessory drive belt tensioner is
mounted on the front of the accessory bracket
which supports the alternator and A/C refrigerant
compressor. This tensioner spring loads in a
counterclockwise direction to apply load to the
belt.
Figure 104 — Drive Belt Arrangement
2. LCF Chassis
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