NOTE: To make sure the air compressor does not contribute to engine vibrations when installed, the air
compressor must be properly timed to the engine.
Use the barring tool, Part Number 3824591, or equivalent, to rotate the crankshaft until the number 1 is at top dead
center (TDC).
Align the vibration damper so that the TDC indicator on the vibration damper is at the 12-o’clock position.
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 ).
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.
Set the air compressor to top dead center (TDC) by aligning the two timing marks on the rear of the
compressor and on the rear drive.
