GM 12586532
Camshaft

The first step is to take off both the Camshaft cover and Camshaft position (CMP) sensor before the Camshaft replacement process. Rotate the Crankshaft clockwise until the #1 Piston is at top dead center (TDC) on the compression stroke. Secure j 44221 Camshaft holding tool behind the camshafts before you remove the intake and exhaust Camshaft sprocket bolts while keeping up proper tension with j 44222 Camshaft sprocket holding tool. Move the sprocket and Timing Chain from the camshafts onto the j 44222 tool. The j 44221 can be removed along with all Camshaft caps after you loosen the bolts in alternation until all valve spring pressure is gone. Cylinder heads require a removal of all camshafts. For installation, coat the Camshaft journals, thrust face, and lobes with clean engine oil, then install the j 44221 with the Camshaft flats up and the #1 Piston at tdc. The user should replace the intake and exhaust camshafts in their original configuration while checking that the marked slots on the Camshaft caps match their correct placement. Install the Camshaft caps together with bolts and follow even torque specifications to 12 n.m (106 lb in). Use a 25 mm (1 in) wrench on each hex of the camshafts to assist in aligning the sprockets before you carefully transfer the sprockets with Timing Chain from j 44222 to Camshaft positions. Install the new intake Camshaft sprocket bolt onto the Camshaft first then apply torque using the j 45059 angle meter which must reach 100 degrees past the initial 20 n.m (15 lb ft) torque value and then tighten the exhaust Camshaft actuator bolt to 25 n.m (18 lb ft) with an additional 135 degrees using this same tool. To finish the repair you must first discard j 44221 before placing the cmp sensor and then reinstall the Camshaft cover.

You can begin Camshaft replacement by taking out the Camshaft cover together with the Camshaft position (CMP) sensor. Reverse Crankshaft rotation until the #1 Piston reaches its top dead center (TDC) position on the compression stroke. The delphi word on the exhaust Camshaft position actuator needs to become parallel to the cam cover mating surface of the Cylinder Head. You should install the Camshaft holding tool (J 44221) behind the camshafts before discarding both intake and exhaust Camshaft sprocket bolts. The installation of the Camshaft sprocket holding tool (J 44222) to the Cylinder Head front requires complete tightening of its two bolts while proper adjustment of the horizontal bolt into the exhaust Camshaft phaser actuator sprocket before sprocket removal from camshafts. Adjust the horizontal bolts into the Camshaft sprockets that are attached to the j 44222 tool which functions as a Cylinder Head sprocket holder to sustain chain tension. Transfer the sprocket with Timing Chain from each Camshaft to the Camshaft sprocket holding tool (J 44222). The mechanic should loosen the Camshaft cap bolts slightly to clear valve spring pressure before removing both caps and the Camshaft holding tool (J 44221) along with the camshafts from the Cylinder Head. Clean engine oil should be applied to the Camshaft journals thrust face and lobes before mounting the Camshaft holding tool (J 44221) with Camshaft flat positioned up against the #1 tdc position. After oiling the intake and exhaust camshafts plus their caps reconstruct them within the original positions by using the marks on the caps as alignment guidance. Put the Camshaft caps in place following their identification marks while tightening all Camshaft cap bolts equally to 12 n.m (106 lb in). A 25 mm (1 in) wrench applied to the hex of the camshafts allows you to steadily rotate them for alignment pin insertion. Remove the Camshaft sprocket holding tool (J 44222) after sliding the sprockets with Timing Chain to the camshafts. Use the angle meter (J 45059) to tighten the intake Camshaft sprocket bolt to 20 n.m (15 lb ft) and an extra measurement of 100 degrees while tightening the exhaust Camshaft actuator bolt to 25 n.m (18 lb ft) with an additional 135 degrees. Reinstall the Camshaft cover after installing the cmp sensor while taking out the Camshaft holding tool (J 44221).

Coat the camshaft journals, thrust face, and lobes with clean engine oil.

Ensure the two bolts holding the J 44222 Camshaft Sprocket Holding Tool to the front of the cylinder head are tightened and the horizontal bolt into the exhaust camshaft phaser actuator sprocket is correctly adjusted.