GM 10114177
Timing Chain

Starting the Timing Chain and sprockets replacement process requires removal of the engine front cover. First line up timing marks between camshaft and crankshaft sprockets before removing camshaft sprocket bolts and camshaft sprocket and Timing Chain. After placing the crankshaft protector button (J 42846) at the crankshaft's end you must remove the crankshaft sprocket with a suitable three jaw puller. Inspection of both the Timing Chain and its sprockets should follow cleansing procedures. The crankshaft sprocket installer (J 22102) permits installation of the crankshaft sprocket by properly positioning its keyway toward the crankshaft pin. After removing the installer rotate the crankshaft to position its alignment mark at the 12 o'clock mark. Before installation of the camshaft sprocket place its alignment mark in the 6 o'clock position so the sprocket teeth meet the Timing Chain without damaging the camshaft retainer. You must avoid hammering when installing. Begin the camshaft sprocket installation when both sprockets display 12 o'clock crankshaft and 6 o'clock camshaft positions. Tighten the camshaft sprocket bolts to 30 nm (22 ft. Lbs.). The final step involves putting on the engine's front cover.

Before beginning the Timing Chain and sprocket replacement process start by uninstalling the Oil Pump then turn the Crankshaft to sync its timing marks with the camshaft and Crankshaft sprockets while abstaining from re-spinning the Crankshaft assembly post Timing Chain removal to safeguard against piston assemblies or valve damage. Begin by removing the camshaft sprocket bolts which leads naturally to extracting both the sprocket and Timing Chain. Use three tools: j 8433 two jaw puller (J 8433), j 41816-2 Crankshaft end protector (J 41816-2), and j 41558 Crankshaft sprocket remover (J 41558) to remove the Crankshaft sprocket before removing its key when required. Clean and inspect timing chains along with sprockets if needed. Begin Crankshaft key installation by placing the key inside its keyway then tap it until both ends rest properly. To install the Crankshaft sprocket begin by aligning the sprocket keyway to the Crankshaft key while using the j 41665 Crankshaft balancer and sprocket installer (J 41665) to fully seat the sprocket against the Crankshaft flange. To align both sprockets correctly, position the Crankshaft sprocket's alignment mark at 12 o'clock to ensure the camshaft sprocket locating pin fits into its alignment hole while sprocket teeth and Timing Chain mesh seamlessly together. The installation of the camshaft Timing Chain needs precise alignment between sprockets as the camshaft sprocket alignment mark should rest at the 6 o'clock position. Perform sprocket rotation to align the timing marks before installing the sprocket bolts with a torque setting of 35 nm (26 ft. Lbs.). Afterward reinstall the Oil Pump.

First you must remove the Oil Pump then turn the Crankshaft until the timing alignments match the Crankshaft and camshaft sprocket marks before continuing to prevent piston assembly or valve damage. Begin by removing both camshaft sprocket bolts then take out the camshaft sprocket and Timing Chain. The technician should utilize three tools to detach and replace components: j 8433 two jaw puller (J 8433), j 41816-2 Crankshaft end protector (J 41816-2) and j 41558 Crankshaft sprocket remover (J 41558). Additionally, the removal of the Crankshaft sprocket key may be necessary. Thorough cleaning and inspections should occur before installing the Timing Chain and sprockets when needed. Slide the key into the Crankshaft keyway until both key ends reach the measuring points. Seating operations should be completed using the j 41665 Crankshaft balancer and sprocket installer (J 41665) to fully position the sprocket against the Crankshaft flange after you align the sprocket keyway with the Crankshaft key and mount the Crankshaft sprocket at the Crankshaft front. Check that the sprocket alignment mark faces 12 o'clock by rotating it then verify both the locating pin's alignment with its hole and the correct meshing of sprocket teeth and Timing Chain. The timing alignment marks between the camshaft and Crankshaft sprockets need alignment where the camshaft sprocket's alignment mark faces the 6 o'clock position. To achieve correct mark alignment professionals may need to rotate the camshaft or Crankshaft sprockets before installing the camshaft sprocket bolts at a torque of 35 nm (26 ft. Lbs.), followed by reinstallation of the Oil Pump.

As part of sprocket and Timing Chain replacement begin by removing the Oil Pump and rotating the Crankshaft to achieve proper Crankshaft and camshaft sprocket alignment. After removal of the chain keep the Crankshaft still to protect piston assemblies and valves. You should start by removing the camshaft sprocket bolts then remove the sprocket and the Timing Chain. To remove the Crankshaft sprocket workers should use j 8433 (Two Jaw Puller) j 41816-2 (Crankshaft End Protector) and j 41558 (Crankshaft Sprocket Remover) before removing the Crankshaft sprocket key if needed. Inspect the Timing Chain as well as the sprockets before cleaning them only if necessary. Start your installation process by inserting the key into the Crankshaft keyway then tap until the key seats completely. Place the Crankshaft sprocket on the Crankshaft front while lining up the keyway of the sprocket with the key of the Crankshaft. Then use the j 41665 (Crankshaft Balancer and Sprocket Installer) to push the sprocket fully against the Crankshaft flange. Position the Crankshaft sprocket alignment mark at the 12 o'clock position to verify the camshaft sprocket locating pin matches the sprocket alignment hole as the sprocket teeth fit with the Timing Chain and both sprocket alignment marks should match with the camshaft sprocket alignment mark at the 6 o'clock position. Place the camshaft sprocket along with the Timing Chain in position before using necessary adjustments to the camshaft or Crankshaft sprockets to set their timing marks correctly. Next install camshaft sprocket bolts before tightening them to 35 nm (26 ft.lbs.) and reinstalling the Oil Pump.

To install timing scarp and sprockets;fit crank shaft sprocket using the front cover aligner and seal installer (J 22102), which should align the keyway of crankshaft sprocket in relation to the crank shaft pin. Move the crankshaft in order for the crankshaft sprocket alignment mark to be at 12 o'clock. Do not hammer the Camshaft sprocket onto the Camshaft to avoid the rear Camshaft plug been knocked off and damaging the Camshaft. Mount the Camshaft sprocket with its alignment mark at the 6 o'clock position, while making sure that the sprocket teeth align with the Timing Chain to prevent Camshaft retainer damage. With the Camshaft sprocket and Timing Chain both installed make sure that the crank sprocket is at 12 o'clock and the Camshaft sprocket at 6 o'clock. Mount the Camshaft sprocket bolts and tighten the bolts to 30 nm (22 ft. Lbs) in two steps.

To change the Timing Chain and sprocket for ly6, l76, l92 engines, you need the following tools: en 46330 Timing Chain Tensioner retaining pin (EN 46330), j 8433 puller bar (J 8433), j 41478 crankshaft front oil seal installer (J 41478), j 41558 crankshaft sprocket remover (J 41558), j 41665 crankshaft balancer and sprocket installer (J 41665), j 41816-2 crankshaft end protector (J 41816-2), j 42386-a flywheel holding tool (J 42386-A), and j 45059 angle meter start by removing the Oil Pump and Starter motor which should ensure the teeths of j 42386-a cooperate with the engine flywheel. Mounting the j 42386-a with one m10-1.5 x 120 mm, one m10-1.5 x 45 mm bolt, while tightening both to 50 n.m (37 lb ft). Artefacts. Rotate the crankshaft sprocket so as to line the camshaft position actuator and crankshaft sprocket marks, then remove and discard the cmp actuator solenoid valve (234) and cmp actuator (235) as well as the Timing Chain (208). Loosen and isolate the cmp actuator and Timing Chain off the camshaft and use a strap of the actuator to the reluctor wheel with a tie strap. Remove Timing Chain tension bolts (231) and tensioner (232), remove the crankshaft sprocket (207) using the j 41816-2, j 41558, bolts,and j 8433. Taper the key into the crankshaft keyway and drive the key, install the crankshaft sprocket, and line up the sprocket keyway with keyway. The j 41478 and that of j 41665 to be used to install the crankshaft sprocket making it fully seated. Compress the Timing Chain Tensioner guide, installing the en46330 after that, then Timing Chain Tensioner with tightening up to 25 n.m (18 lb ft). Mount the cmp actuator to the locating pin of the camshaft, making sure the teeth of the sprocket and Timing Chain align, and the alignment marks are accurate. Change a new cmp actuator valve (234), which should be firmly threaded into the camshaft. Check the sprockets align, then remove the en 46330 and go to the cmp actuator solenoid valve, tighten it first to 65 n.m (48 lb ft) and then 90° more using the j 45059. Lastly, strip off the j 42386-a and bolts, and retighten the Starter motor and Oil Pump.

You must start your repair process by disassembling the engine front cover before proceeding. Begin by putting the camshaft and crankshaft timing marks in alignment before loosening the camshaft sprocket bolts. Finish by removing the camshaft sprocket and Timing Chain from the assembly. The crankshaft protector button (J 42846) goes into the crankshaft's end before using a suitable three jaw puller to remove the crankshaft sprocket. Professionally clean the Timing Chain components along with their sprockets. The crankshaft sprocket installer (J 22102) helps install the crankshaft sprocket while maintaining perfect alignment between the keyway and crankshaft pin. Use the crankshaft sprocket installer (J 22102) to remove it from the crankshaft. Next, spin the crankshaft to position the crankshaft sprocket alignment marks at the 12 o'clock position. You must position the camshaft sprocket alignment mark to the 6 o'clock mark before installing it. The sprocket must slip its teeth into the Timing Chain to avoid damaging the camshaft retainer structure. The installation process requires using anything other than a hammer. The correct installation of the camshaft sprocket starts with checking to ensure both the crankshaft sprocket sits at the 12 o'clock mark and the camshaft sprocket rests at the 6 o'clock position. Tighten the camshaft bolts to 30 nm (22 ft. Lbs.) torque. To finish the installation you need to reposition the engine front cover.

Verify the alignment of the camshaft and crankshaft sprocket marks before installing the crankshaft position sensor reluctor ring and the engine front cover.

Install the camshaft sprocket and timing chain, and if necessary, rotate the camshaft or crankshaft sprockets to align the timing marks.

Avoid using a hammer to install the camshaft sprocket to prevent dislodging the expansion cup plug or damaging the camshaft.

Tighten the camshaft sprocket bolts to 25 Nm (18 ft. lbs.).