GM 12598504
Tensioner

A successful Timing Chain tensioner replacement requires the use of the camshaft holding tool (J 44221) among other necessary tools. First remove both the camshaft cover and engine front cover from the assembly. Rotate the Crankshaft clockwise until the #1 Piston reaches top dead center (TDC) on the compression stroke, ensuring the word delphi on the exhaust camshaft position actuator is parallel with the Cylinder Head to cam cover mating surface. Set the camshaft holding tool (J 44221) in position behind the camshafts. Use the timing marks as indicators to mark the Timing Chain links where they are positioned near the exhaust camshaft position actuator sprocket and both intake and Crankshaft sprockets. Turn the tensioner shoe inside out to gain Timing Chain tension control then use a tee attachment to keep the shoe in position. Begin by removing the engine's Timing Chain tensioner bolts before taking out the tensioner itself. To complete installation insert the Timing Chain tensioner into its engine position and fasten the tensioner bolts to 25 nm (18 ft. Lbs.). Reinstall the tee from the Timing Chain tensioner for chain tension restoration then remove the camshaft holding tool (J 44221) from the camshafts. Line up the marked Timing Chain segments with position markers on both the exhaust camshaft position actuator sprocket and intake camshaft sprocket and Crankshaft sprocket. Place the engine front cover followed by the camshaft cover during the installation process.

The first step to replace the Timing Chain Tensioner requires removal of camshaft cover and engine front cover. Rotate the Crankshaft clockwise until the #1 Piston is at top dead center (TDC) on the compression stroke. Use the j 44221 (Camshaft Holding Tool) to secure the camshafts in position toward their rear ends. Using the timing marks you should mark three Timing Chain links which must be adjacent to the exhaust camshaft position actuator sprocket and intake camshaft sprocket and Crankshaft sprocket. Move the tensioner shoe into its released position then secure it with a tee that will maintain the shoe's alignment. The process begins with Timing Chain Tensioner bolt removal followed by removal of the tensioner from the engine block. To install the Timing Chain Tensioner position it on the engine then bolt it down with 25 nm (18 lb ft) torque. After removing the tee from the Timing Chain Tensioner you can restore chain tension before removing j 44221 from the camshafts. Marked Timing Chain links must match the timing markers found on the exhaust camshaft position actuator sprocket as well as the intake camshaft sprocket and Crankshaft sprocket. Afterward, install the engine front cover along with the camshaft cover.

Start by removing the camshaft cover together with the engine front cover before you can replace the Timing Chain tensioner. Rotate the Crankshaft clockwise until the #1 Piston is at top dead center (TDC) on the compression stroke. The j 44221 (Camshaft Holding Tool) which goes at the camshaft rear needs extra attention to safety. Mark the Timing Chain links next to the timing marks which are visible on the exhaust camshaft position actuator sprocket and intake camshaft sprocket and Crankshaft sprocket. Put a tee into the tensioner to hold the shoe in place after moving the tensioner shoe in. Start by detaching the bolts from the Timing Chain tensioner then pull the tensioner assembly out from the engine. Monte carlo mark sets Timing Chain tensioner position on the engine before securing Timing Chain tensioner bolts at 25 n.m torque (18 lb ft). When the tee is removed tension returns to the Timing Chain so j 44221 can be taken off from the camshafts. Position each seventh dark link of the Timing Chain to match the timing indicators which appear on the exhaust camshaft position actuator sprocket, intake camshaft sprocket, and Crankshaft sprocket. Afterward position both the engine front cover and camshaft cover in place.

To get started with changing the Timing Chain tensioner, collect these tools at first: camshaft holding tool (J 44221). You should start by taking off the camshaft cover and the engine front cover. Make sure to turn the Crankshaft clockwise until #1 Piston reaches the top dead center on the compression stroke, with the delphi writing on the exhaust camshaft actuator flat against the Cylinder Head to cam cover surface. Put the camshaft holding tool (J 44221) onto the camshafts from behind. By following the timing marks, put marks on the chain links next to the exhaust camshaft position actuator sprocket, intake camshaft sprocket, and Crankshaft sprocket. Take some tension off the Timing Chain by pressing the tensioner shoe inward and then put a tee into the tensioner to keep the shoe that way. Take out the Timing Chain tensioner bolts, then take off the Timing Chain tensioner from the engine. With installation, place the Timing Chain tensioner onto the engine, and install the Timing Chain tensioner bolts, making sure they are tightened to 25 nm (18 ft. Lbs.). Once you take the tee out of the Timing Chain tensioner, you will let the Timing Chain tighten and then remove the camshaft holding tool (J 44221) from the camshafts. Make sure the Timing Chain's marked links are matched to the timing marks on the exhaust camshaft position actuator sprocket and the intake and Crankshaft sprockets. Once everything else is complete, put the engine front cover and the camshaft cover both in place.

A successful Timing Chain tensioner replacement requires the use of the camshaft holding tool (J 44221) among other necessary tools. First remove both the camshaft cover and engine front cover from the assembly. Rotate the Crankshaft clockwise until the #1 Piston reaches top dead center (TDC) on the compression stroke, ensuring the word delphi on the exhaust camshaft position actuator is parallel with the Cylinder Head to cam cover mating surface. Set the camshaft holding tool (J 44221) in position behind the camshafts. Use the timing marks as indicators to mark the Timing Chain links where they are positioned near the exhaust camshaft position actuator sprocket and both intake and Crankshaft sprockets. Turn the tensioner shoe inside out to gain Timing Chain tension control then use a tee attachment to keep the shoe in position. Begin by removing the engine's Timing Chain tensioner bolts before taking out the tensioner itself. To complete installation insert the Timing Chain tensioner into its engine position and fasten the tensioner bolts to 25 nm (18 ft. Lbs.). Reinstall the tee from the Timing Chain tensioner for chain tension restoration then remove the camshaft holding tool (J 44221) from the camshafts. Line up the marked Timing Chain segments with position markers on both the exhaust camshaft position actuator sprocket and intake camshaft sprocket and Crankshaft sprocket. Place the engine front cover followed by the camshaft cover during the installation process.

Gather the necessary tools, including the Camshaft Holding Tool (J 44221).

Align the marked links on the timing chain with the timing marks on the exhaust camshaft position actuator sprocket, the intake camshaft sprocket, and the crankshaft sprocket.

Release the tension on the timing chain by moving the tensioner shoe in and place a tee into the tensioner to hold the shoe in place.