DESCRIPTION AND OPERATION
Page 71
There are 45 gear teeth on the crankshaft gear,
90 teeth on the camshaft gear and 48 on the idler
gear. Because the idler gear has 3 more teeth
than the crankshaft gear, the timing marks
(Figure 81) align only once every 16 revolutions
of the crankshaft. This is called a “hunting tooth”
system.
81
Figure 81 — Timing Marks
Air Compressor
E7, E-Tech™ and ASET™ air compressors have
the same internal components, as the air
compressor functions equally well with either
direction of rotation. There are, however, some
external differences between the engines and air
compressors, which prevent the compressors
from being interchangeable between the E7 and
the E-Tech™ or ASET™ engines.
The air compressors used on all ASET™ AC
engines utilize filtered air from the engine air
intake system for their inlet air supply, not engine
boost pressure. Previous engine designs used
engine boost pressure.
Power Steering Pump
All ASET™ engines have the capability of driving
a power steering pump from either the front or
rear of the auxiliary shaft. Naturally, the direction
of rotation of a front power steering pump is
opposite that of a rear power steering pump.
Always refer to part number specification
information when installing a power steering
pump to ensure that the correct part with the
correct direction of rotation is being used.
Installing a power steering pump with the wrong
direction of rotation will result in pump failure and
inoperative power steering.
Vibration Damper Hub
Because of the wide timing gears used on
ASET™ engines, it is essential that the correct
vibration damper hub is used. The vibration
damper hub is 3/8 inch shorter than the E7 hub
(Figure 82) which is similar in appearance.
Always make sure the correct vibration damper is
used for the correct engine model.
82
Figure 82 — Vibration Damper Hub
1. ASET™/E-Tech™ Hub 2. E7 Hub
5-111.bk Page 71 Monday, July 10, 2006 2:26 PM
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