Centinel System – Repair Manual – 001-088   Engine Base Timing

The injector camshaft scissor gear must be unloaded during removal of the valve camshaft gear. To unload the gear, two of the gear screws must be backed out far enough to allow the teeth on the scissor gear to be aligned.

Unload the injector camshaft scissor gear.

Remove the valve camshaft gear mounting capscrew and washer.

Early production engines were not equipped with puller holes in the valve camshaft gear. A 3-jaw gear puller must be used for gears that do not have puller holes. The injector and valve gear puller, Part Number 3163069, can be used for gears that have puller holes.

Install the gear puller, Part Number 3163069.

Install the valve camshaft gear mounting capscrew completely.

Loosen the capscrew two turns.

Use the gear puller to remove the valve camshaft gear from the camshaft nose.

Remove the puller.

Do not completely remove the camshaft gear mounting capscrew when the 3-jaw puller is used. The capscrew serves as a safety catch by preventing the gear from shooting off of the camshaft nose.

Remove the valve camshaft gear mounting capscrew, spacer, and valve camshaft gear.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Some solvents are flammable and toxic. Read the manufacturer’s instructions before using.

Use a lint free cloth and solvent to clean the Loctite™ residue from the nose of the camshaft.

CAUTION  Remove the rear injector camshaft cover plate before removal of the injector camshaft gear or camshaft. The force required to remove the camshaft gear creates sufficient backwards movement of the camshaft to crack the rear cover plate.

Remove the injector camshaft rear cover plate.

Remove the injector camshaft scissor gear mounting capscrew and washer.

Install gear puller, Part Number 3163069.

Install the injector camshaft scissor gear mounting capscrew. Loosen the capscrew one turn.

Use the gear puller to force the injector camshaft scissor gear off the camshaft taper.

Remove the gear puller.

Remove the capscrew.

Remove the injector camshaft scissor gear.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Some solvents are flammable and toxic. Read the manufacturer’s instructions before using.

Use a lint free cloth and solvent to clean the Loctite™ residue from the nose of the camshaft.

CAUTION  Remove the rear injector camshaft cover plate before removal of the injector camshaft gear or camshaft. The force required to remove the camshaft gear creates sufficient backwards movement of the camshaft to crack the rear cover plate.

Remove the injector camshaft rear cover plate.

Remove the injector camshaft gear mounting capscrew and washer.

Install gear puller, Part Number 3163069.

Install the injector camshaft gear mounting capscrew. Loosen the capscrew one turn.

Use the gear puller to force the injector camshaft gear off the camshaft taper.

Remove the gear puller.

Remove the capscrew.

Remove the injector camshaft gear.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Some solvents are flammable and toxic. Read the manufacturer’s instructions before using.

Use a lint free cloth and solvent to clean the Loctite™ residue from the nose of the camshaft.

The adjustable idler gear shaft can fall out when the adjustable idler gear is removed.

Remove the retainer capscrews, retainer, gear, and adjustable idler gear shaft.

Remove the mounting spacer.

The lower idler scissor gear must be unloaded during removal. To unload the gear, two of the gear screws must be backed out far enough to allow the teeth on the scissor gear to be aligned.

Unload the lower idler scissor gear.

Remove the idler scissor gear capscrews.

Remove the retainer, gear, shaft, and thrust bearing.

Remove the idler non-scissor gear capscrews and retainer.

Remove the gear, shaft, and thrust bearing.