Service Manual

Air Compressor ISB, ISBe and QSB (Common Rail [...]
Page 12-26 Section 12 - Compressed Air System - Group 12
To buy Cummins Parts and Service Manuals, Training Guides, or Tools go to our website at https://store.cummins.com
NOTE: If no TDC mark is present on either the vibration
damper or the crankshaft speed indicator ring, align the
large gap in the crankshaft speed indicator ring to the 5-
o'clock position (2). The dowel pin can also be visible in
the 9-o'clock position (1).
Wabco™ Air Compressors
Set the timing mark on the air compressor gear to the 9-
o'clock position when looking at the gear. It must point at
the casting depression on the side of the air compressor
mounting flange.
Knorr-Bremse™ Air Compressors
Set the air compressor to TDC by aligning the two timing
marks on the rear of the compressor and on the rear
drive.