Service Manual

ISB, ISBe and QSB (Common Rail [...] Air Compressor
Section 12 - Compressed Air System - Group 12 Page 12-29
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CAUTION
Air compressor failure can result if any of the mating
surfaces are not touching prior to tightening.
Verify the air compressor support bracket is contacting the
cylinder block support bracket. Adjust the brackets as
necessary. If necessary, loosen the cylinder block support
bracket to align the components.
Tighten the air compressor support bracket mounting
capscrews (1).
If loosened, tighten the cylinder block support bracket
cylinder block mounting capscrews (2).
Tighten the compressor support bracket to the cylinder
block support bracket mounting capscrews (3).
Torque Value:
M8 24 N•m [ 212 in-lb ]
Torque Value:
M10 43 N•m [ 32 ft-lb ]
Torque Value:
M12 77 N•m [ 57 ft-lb ]
Knorr-Bremse™ Air Compressors
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.
Apply clean 15W-40 engine oil or assembly lubrication,
Cummins® Part Number 3163087, or equivalent, to both
o-ring recesses. This will help keep the o-rings in the
correct location while installing the compressor.
Install new o-rings onto the air compressor.
Locate both the large (1) and small (2) o-rings as shown
in the illustration at right into the recesses; making sure
they are both located correctly.
With the engine set at TDC, install the air compressor
engaging the air compessor drive gear with the camshaft
gear.
Install the air compressor mounting fasteners and tighten.
Torque Value: 77 N•m [ 57 ft-lb ]