Service Manual

ISB, ISBe and QSB (Common Rail [...] Air Compressor
Section 12 - Compressed Air System - Group 12 Page 12-27
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Install
Wabco™ Air Compressors
For Wabco™ air compressors, use the following
procedure.
Prior to installing the air compressor, identify which gasket
is going to be installed so that, if necessary, the basekt
can be properly oriented.
There are two types of accessory drive cover gaskets:
• Three round oil supply passages and one elongated oil
supply passage
• Four round oil supply passages.
It is preferred that, when installing the air compressor, the
gasket with the four round oil supply passages be used.
The gasket can be installed in any orientation. If only the
gasket with the one elongated oil supply passage is
available, install the gasket so that the elongated oil
supply passage is not over the oil supply port in the rear
gear housing.
CAUTION
The air compressor gasket must sit flat against the
gear housing without any interference to prevent air
compressor failure.
CAUTION
Air compressor failure can result if the oil feed hole is
not aligned with the oil passage in the gear housing
or if the wrong gasket is used.
NOTE: Rotate the engine slightly before or after top dead
center (TDC), if necessary, to properly engage the
compressor drive gear with the camshaft gear.
With the engine set at TDC, install the air compressor and
a new gasket onto the rear gear housing engaging the air
compressor drive gear with the camshaft gear.
Install the air compressor mounting fasteners and tighten.
Install the air compressor mounting fasteners and finger-
tighten the capscrews.
Install the air compressor support bracket.
Install the air compressor support bracket to the cylinder
block mounting bracket mounting capscrews and finger-
tighten.
Install the air compressor support bracket mounting
capscrews and finger-tighten.