GM 12684831
Camshaft Gear

The process starts with removing the lower Intake Manifold from lp1 and ly7 engines or the Intake Manifold from llt engines to replace bank 2 (Left Side) exhaust camshaft position actuator. Begin by removing the left camshaft cover then proceed to take away the exhaust and intake camshaft position sensors at the left side. Take both left intake and exhaust camshaft position actuator solenoids out of their positions. Use clockwise turns only on the balancer bolt to shift the crankshaft until you reach the neutral spot of the camshafts before noting cam positions and actuator markings for reassembly. Apply marks on the Timing Chain links using a paint stick and then place the marks against the adjacent teeth of the camshaft position actuators. Use the en-48313 Timing Chain retention tool (EN-48313) by inserting its feet towards the engine front with legs partially expanded. Use hand force on the en-48313 tool and then an open-end wrench to add space in the chain between the actuators. Put on safety equipment and dismantle the left exhaust camshaft actuator with its bolt to position it for extraction. Match the exhaust camshaft actuator marks for timing and install it manually at first before taking out the en-48313 tool. Turn the exhaust camshaft actuator bolt to 58 n.m with a 43-pound foot torque setting. Reassemble the left intake and exhaust camshaft position sensors, solenoids, left camshaft cover and either lower Intake Manifold for lp1 and ly7 engines or new Intake Manifold for llt engines.

The repair process for a Camshaft position intake actuator demands the removal of Camshaft cover and spark plugs before proceeding. The en-48953 (Camshaft Actuator Locking Tool) should be installed clockwise to keep the Crankshaft in position. Install retainer bolts on the Camshaft but tighten them only to 10 nm (89 lb in) before loosening the intake actuator bolt which stays in place. Start by soaking the Timing Chain and gears with solvent followed by marking both the Timing Chain and Camshaft position actuators for proper assembly. The en-48953 (Camshaft Actuator Locking Tool) needs to be removed from the system. Begin by notation of intake and exhaust Camshaft actuator positions on the Timing Chain followed by upper Timing Chain Guide bolt and guide removal together with the Timing Chain Tensioner. The en-48749 (Timing Chain Retention Tool Kit) should be installed at both the Timing Chain ends of the intake and exhaust side before removing and discarding the intake Camshaft actuator bolt. Moving the exhaust Camshaft clockwise with a small rotation breaks the Timing Chain tension followed by removing the intake Camshaft actuator from the Camshaft as it disconnects itself from the chain. Check that the aligning mark on the intake Camshaft actuator faces the Timing Chain mark before you install the Timing Chain to the actuator and secure both parts to the Camshaft. Install a new intake Camshaft actuator bolt just until it becomes tight and then take away the Timing Chain retention tools located on both sides of the Timing Chain. Reinstall the Timing Chain Tensioner and replace the en-48953 (Camshaft Actuator Locking Tool) before tightening its mechanisms. The en-45059 (Angle Meter) should be used to torque the new Camshaft actuator bolt to 30 nm (22 lb ft) along with an extra 100 degrees and torque both existing Camshaft actuator retainer bolts to 10 nm (89 lb in). Rigorous torque of 45 nm (33 lb ft) counterclockwise on the Crankshaft balancer bolt will free up the tensioner for removal after removal of the en-48953 (Camshaft Actuator Locking Tool). Place the upper Timing Chain Guide before installing its bolts at 10 nm (89 lb in) strength and replace the spark plugs while reinstalling the Camshaft cover.

Use an open wrench on the hex cast into the camshaft.

Align the exhaust camshaft actuator alignment mark to the timing chain alignment mark made during disassembly.

First, remove the left exhaust camshaft actuator.

Next, take out the intake camshaft position actuator bolt and then remove the right intake camshaft position actuator.

To avoid affecting engine performance and triggering an engine code.

Install the primary camshaft drive chain tensioner.

Use the circle marking on the outer ring of the camshaft position actuator for alignment with the highlighted timing chain link on the left side of the engine.

Use an open wrench on the hex cast into the camshaft.

Create alignment marks on the timing chain links and the adjacent teeth on both the intake and exhaust camshaft position actuators.

Remove the upper intake manifold, lower intake manifold, and camshaft cover.

Rotate the crankshaft balancer in a clockwise direction only, using the crankshaft balancer bolt.

Install the primary upper camshaft drive chain guide.

Ensure the correct camshaft thrust washer is used based on the number of attaching screws on the actuator, then install the thrust washer if applicable.

Reinstall the engine front cover.

Take out the right intake and exhaust camshaft position sensors, followed by the right intake and exhaust camshaft position actuator solenoids.

Install the right bank secondary camshaft drive chain guide.

Install the secondary camshaft drive chains, remove the pin from the primary timing chain tensioner release lever, ensure the primary timing marks are aligned vertically, and reinstall the oil pump.

Install the primary upper camshaft drive chain guide and the primary camshaft drive chain tensioner.

Insert the EN-48313 tool between the camshaft actuators, ensuring the feet face the front of the engine, and partially expand the legs to contact the timing chain without tightening.

First, remove the lower intake manifold on LP1 and LY7 engines or the intake manifold on LLT engines.

Start with the primary camshaft timing chain.

Begin by removing the engine front cover.

Remove the camshaft cover.

Ensure the alignment mark on the intake camshaft actuator is properly aligned with the timing chain mark.

Remove the tools from both the intake and exhaust camshaft sides of the timing chain assembly.

Install the upper timing chain guide and bolts, tightening them to 10 Nm (89 lb in), followed by the spark plugs and camshaft cover.

Use the 24 mm wrench (J 44217) to hold the camshaft while tightening the NEW camshaft actuator bolt to 85 N.m (63 lb ft), plus an additional 30 degrees using the Angle Meter (J 45059).

Take out the spark plugs to facilitate crankshaft rotation.

Unscrew the EN-48313 to retract its legs, then insert it between the camshaft actuators to maintain alignment during the process.

Create alignment marks on the timing chain links and the adjacent teeth on both the intake and exhaust camshaft position actuators.

Install the actuator bolt hand tight.

Position the intake camshaft position actuator onto the camshaft and loosely install the bolt.

Remove the right exhaust camshaft position actuator.

Begin by removing the intake manifold and the left camshaft cover.

Next, take out the intake camshaft position actuator bolt and then remove the left intake camshaft position actuator.

Tighten the camshaft position actuator bolt.