Chevrolet Silverado / GMC Sierra. Service manual — part 2171

Fig. 199: Proper Installation Of CMP Actuator
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

10. Install the CMP actuator and timing chain. Align the hole in the rear face of the CMP

actuator with the locating pin on the front face of the camshaft. If necessary, rotate the
camshaft or crankshaft sprockets in order to align the timing marks. Use care to install the
actuator completely onto the front of the camshaft. Position fingers onto the face of the
actuator sprocket and push the actuator onto the front of the camshaft. Never push on the
reluctor wheel when attempting to install the actuator.

CAUTION: Refer to Camshaft Position Actuator Removal and

Installation Caution .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 200: Inspecting For Proper Installation Of CMP Actuator & Timing Chain
Courtesy of GENERAL MOTORS CORP.

11. Locate a straight edge across the front face of the engine block and inspect for proper

installation of the CMP actuator and timing chain. With the CMP actuator properly and
completely installed onto the front of camshaft, the timing chain will not protrude beyond

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

the front face of engine block.

Fig. 201: View Of CMP Actuator Solenoid Valve
Courtesy of GENERAL MOTORS CORP.

12. Install a NEW CMP actuator solenoid valve (234). With the CMP actuator properly

positioned onto the camshaft, the CMP actuator solenoid valve can be threaded completely
into the camshaft using light hand pressure. Tighten by hand until snug.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado