Installation Procedure

Insert the intake camshaft sprocket to the engine to engine front cover and timing chain.
Install the 2 camshaft sprockets (2) along with the timing chain (1) to the camshafts.

Fig 1: Timing Chain And Camshaft Sprockets
Courtesy of GENERAL MOTORS COMPANY
Install the 2 camshaft sprocket bolts (2) and the 2 camshaft position exciter wheels (1).

Fig 2: Camshaft Position Exciter Wheels And Camshaft Sprocket Bolts
Courtesy of GENERAL MOTORS COMPANY
Remove EN-955-10 pin to apply tension to the timing chain.
Tighten the 2 camshaft sprockets. Refer to Camshaft Timing Chain Adjustment .
NOTE: Engine must be adjusted to TDC.
Remove all special tools for timing chain adjustment. Refer to Camshaft Timing Chain Adjustment .
Install the upper timing chain guide (2).

Fig 3: Upper Timing Chain Guide And Bolts
Courtesy of GENERAL MOTORS COMPANY
Install the 2 upper timing chain guide bolts (1) and tighten to 8 N.m (71 lb in).
CAUTION: Refer to Fastener Caution .
Install the 2 camshaft position actuator solenoid valves. Refer to Camshaft Position Actuator Solenoid Valve Installation .
Install the camshaft cover. Refer to Camshaft Cover Replacement .
Install the timing chain tensioner plug and tighten to 50 N.m (37 lb ft).
Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
Check and correct engine oil level.
Close the hood.