GM 90573286
Camshaft Gear

Start servicing and repairing the camshaft gear/sprocket by first removing the intake air resonator and then the intake plenum followed by removal of the Timing Belt cover. Follow up by taking off the Timing Belt and then position the Crankshaft counterclockwise at 60 degrees btdc for safety against valve and piston collisions. You should install the j 42069-1 along with the j 42069-2 from the Timing Belt alignment kit (J 42069) between camshaft drive sprockets to keep these components in position while unscrewing the camshaft drive sprocket bolt. Begin by extracting the camshaft drive sprocket bolt and afterward remove both j 42069-1 and j 42069-2 parts then proceed with removing the camshaft drive sprocket. The installation process requires precise alignment of the camshaft drive sprocket with numbered slots on the camshafts while using a new camshaft drive sprocket bolt because the old bolt cannot be reused. To tighten the bolt position the j 42069-1 or j 42069-2 against the camshaft drive sprocket and camshaft before utilizing the torque/angle meter (J 36660-A) to achieve a torque of 50 nm (37 ft. Lbs.) with additional 60 degrees followed by 15 degrees. Complete the installation by turning the Crankshaft in a clockwise direction until it reaches top dead center position then reinstall the Timing Belt followed by Timing Belt cover then intake plenum and intake air resonator in order.

Use the J 42069-1 or J 42069-2 to hold the sprocket in place while tightening the bolt with the J 36660-A to a torque of 50 Nm (37 ft. lbs.) plus an additional 60 degrees and 15 degrees.

Ensure that the valves will not touch the pistons.

Remove the timing belt.