GM 12689035
Camshaft

The replacement of the Camshaft begins with radiator support removal followed by valve lifter and engine front cover detachment while configuring the j 42386-a (Flywheel Holding Tool) teeth to mesh with engine Flywheel. You need to install the j 42386-a (Flywheel Holding Tool) with an m10-1.5 x 120 mm bolt and an m10-1.5 x 45 mm bolt and you should tighten them to 50 nm (37 lb ft). The crankshaft sprocket should be rotated to achieve proper alignment between its sprocket mark and the cmp actuator alignment indicator. The mechanic should begin by discarding both the cmp actuator solenoid valve (234) and the cmp actuator (235) while also taking out the Timing Chain (208). Use great caution to lowert damage Camshaft bearings when you extract retainer bolts (204) and retainer (203). Put the Camshaft sprocket bolt through the front hole of the Camshaft to use as a tool while removing the piece from the engine block before discarding the bolt. First apply engine oil to all Camshaft journals and bearings before reinstalling the shaft by using the bolt as a tool for handling. Install the engine block gasket surface if it is unclean before adding the Camshaft retainer (203) and bolts (204). Fasten the first design hex head bolts to 25 nm (18 lb ft) while using the second design torx(R) head bolts to 15 nm (11 lb ft). The en 46330 (Timing Belt Tensioner Retaining Pin) requires installation after compressing the Timing Chain tensioner guide. Proper placement of the cmp actuator must occur on the Camshaft's locating pin with both sprocket teeth aligned to the Timing Chain teeth. Locate the cmp actuator at the 6 o'clock timing mark before installing it together with the Timing Chain while maintaining alignment to the locating pin. Check that the Timing Chain stays inside the engine block's frontal region during inspection of correct installation. Fasten a new cmp actuator solenoid valve (234) by hand until it reaches a proper tightness. The cmp activator sprocket should have its marking aligned at 6 o'clock while the crankshaft sprocket must display its marking at 12 o'clock. Begin by uninstalling the en 46330 before using the j 45059 to reach 90 degrees final torque on the cmp actuator solenoid valve by tightening it first to 65 nm (48 lb ft). Reinstall the engine front cover before putting back the valve lifters and radiator support then discarding the j 42386-a and bolts.

Remove and discard the intake and exhaust camshaft sprocket bolts.

Install three M8-1.25 x 100 mm bolts into the front bolt holes of the camshaft and use them as a handle to carefully rotate and pull the camshaft out of the engine block.

Install the camshaft retainer (203) and bolts (204), tightening the first design hex head bolts to 25 N.m (18 lb ft) and the second design TORX(R) head bolts to 15 N.m (11 lb ft).

Use the same three bolts, ensuring to avoid damage to the bearings.

Clean and inspect the camshaft or bearings as necessary.

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

Ensure the retainer is installed with the sealing gasket facing the engine block and that the gasket surface is clean.

Take out the balance shaft drive gear and the camshaft retainer bolts and retainer.

Take out the camshaft retainer bolts and retainer, ensuring to handle the camshaft carefully to avoid damaging the camshaft bearings.

Tighten it first to 65 Nm (48 lb ft) and then a final pass to 90 degrees using J 45059 (Angle Meter).

Lubricate the camshaft journals and bearings with clean engine oil.