GM 12588272
Actuator

The first step for camshaft drive sprocket replacement starts with Timing Belt removal. The crank hub torx® socket (J42098) permits users to turn the Crankshaft counterclockwise until it reaches 60 degrees before top dead center (BTDC) when identified by the index mark on the oil pump cover while preventing piston-valve contact. The next step entails removing the camshaft drive sprocket bolt while the drive sprockets maintain their position through the Timing Belt alignment kit (J42069-1 and J42069-2) before discarding the existing bolt. First remove the j42069-1 along with j42069-2 then proceed to uninstall the camshaft drive sprocket. The installation process requires the Crankshaft to maintain a 60 degrees btdc position. The camshaft drive sprocket numbered slots should match camshaft pins exactly before checking that the drive sprocket reference mark faces the rear Timing Belt cover notch. Insert the newly provided camshaft drive sprocket bolt while making needed adjustments to the camshaft drive sprockets to achieve proper reference mark position with notches. Use the j42069-1 or j42069-2 tools to suspend the camshaft drive sprocket together with camshaft before torquing the bolt to 50 nm (37 ft. Lbs.). First adjust the Crankshaft gear bolt 60 degrees through the torque/angle meter (J36660-A) before setting it to a further 15-degree angle. Place the Crankshaft at top dead center position using the crank hub torx® socket (J42098) then reinstall the Timing Belt.

Install the right bank secondary camshaft drive chain, its guide, and shoe, and finally, the right bank secondary camshaft drive chain tensioner.

Reinstall the spark plugs and the engine front cover.

Install the right bank secondary camshaft drive chain.

Install the right bank secondary camshaft drive chain, the right bank secondary camshaft drive chain guide, and the right bank secondary camshaft drive chain shoe, then the right bank secondary camshaft drive chain tensioner.

The Torque Reaction Against Timing Drive Chain Notice.

Install the right bank secondary camshaft drive chain guide (125).

Slide the actuator over the camshaft alignment pin and install it onto the camshaft.

Take off the engine front cover.

Remove the upper intake manifold along with the lower intake manifold, followed by the camshaft cover and the camshaft sensors.

Align the timing mark on the outer ring of the actuator with the highlighted timing chain link on the left side of the engine.

Remove the primary camshaft drive chain, crankshaft sprocket, and camshaft intermediate sprocket.

Engage the actuator timing gear teeth with the secondary timing chain, ensuring that the actuator alignment mark corresponds with the paint mark on the chain link.

Install the primary upper camshaft drive chain guide, followed by the primary camshaft drive chain tensioner.