Initial Check
This procedure covers both rear gear train engines and front gear train engines.
Prior to starting this procedure, make sure there is adequate clearance to remove the camshaft from the rear of the engine for rear gear train engines and from the front of the engine for front gear train engines.
NOTE: It may be necessary to remove OEM components (radiator, charge-air cooler assembly, etc.) for access.
Refer to the OEM service manual.
If adequate clearance can not be obtained, the engine must be removed.
Remove
Rear Gear Train
NOTE: The engine can have either a mark on the crankshaft gear or a chamfered tooth.
Rotate the engine to align the timing marks on the camshaft and crankshaft gear. When the timing marks are
aligned, cylinder 1 is at Top Dead Center (TDC).
NOTE: When the timing marks on the camshaft gear and crankshaft gear are aligned, the camshaft gear keyway
should be at the 12 – o’clock position. Also check to make sure that at this position, the Top Dead Center (TDC)
indicator on the vibration damper is at the 12 – o’clock position.
Service Tip: The engine can be rotated by installing two of the flywheel/flexplate mounting capscrews half way.
Then use a pry bar in between the two capscrews to rotate the engine.
Service Tip: Engines equipped with air compressors may require the air compressor be timed to the engine. To be
sure the air compressor is properly timed when the camshaft gear is later installed, scribe an alignment line on the air compressor and camshaft gear before removing the camshaft gear.
On engines equipped with an air compressor/accessory drive, it may be necessary to loosen/remove some the air
compressor/accessory drive mounting hardware in order to remove the camshaft gear. It is not necessary to
remove the air compressor/accessory drive completely.
Loosening or removing some of the air compressor/ accessory drive mounting hardware will give enough
clearance to remove the camshaft gear.
Loosen the air compressor mounting fasteners (1 ).
Remove the two capscrews securing the air compressor support (2).
If equipped with a hydraulic pump driven off of the air compressor, it may be necessary to remove and/or loosen
some or all of the mounting fasteners. Refer to the OEM service manual.
Remove the camshaft gear capscrews and remove the camshaft gear. Refer to Procedure 001-012 in Section 1.
NOTE: On engines equipped with an air compressor/ accessory drive, it may be necessary to move the air
compressor/accessory drive to gain clearance to remove the camshaft gear.
Remove the thrust plate capscrews and remove the thrust plate.
Use a gear puller, Part Number ST647 or equivalent, to attach to the end of the camshaft, where the camshaft
gear mounts, to act as a handle. This will give proper leverage and ease in removing the camshaft.
Use the installed gear puller to slide the camshaft out of the bore.
Front Gear Train
Use barring tool, Part Number 3824591 , to rotate the crankshaft to align the crankshaft to camshaft gear timing
marks.
Because the thrust plate extends more than 180 degrees around the camshaft, the thrust plate can only be removed from the camshaft after removing the camshaft gear from the camshaft. Remove the capscrews from the thrust plate.
Remove the camshaft, camshaft gear, and thrust plate as an assembly.
