GM 24422964
Timing Belt

The first step to replace the Timing Belt with variable camshaft phasing is disconnecting the battery negative cable. Place the j 28647-b (Engine Support Fixture) after the removal of the air cleaner assembly. Then follow the procedure to remove the accessory belt together with its tensioner. The Crankshaft Pulley should receive clockwise rotation until you can align the marking spots which exist between these parts and the cover. Block the crankshaft using the km-6625 (Flywheel Locking Device) and replace the transmission bolt afterward. Begin by removing the cylinder head cover together with the Engine Mount then proceed with the Crankshaft Pulley followed by the Timing Belt upper cover and Engine Mount bracket and Timing Belt lower cover and Timing Belt center cover. The km-6333 (Fixing Rod) combined with manipulating the Timing Belt Tensioner enables you to extract all three components - the Timing Belt and the tensioner and idler. When adjusting place both camshafts in a horizontal position and fit the mk-6628 (Locking Tool) while they remain aligned. The camshaft sprocket positions need adjustment if they are not properly lined up. Place both sides of km-6340 (Locking Tool) into corresponding camshaft sprockets to verify that notches along the crankshaft sprocket and the cover are properly aligned. First install the Timing Belt idler and tensioner and tighten them to 50 nm while tensioner reaches 55 nm before Timing Belt installation and adjustment. Remove the km-6333. The installation starts with Timing Belt center cover while proceeding through Timing Belt lower cover into Engine Mount bracket and finishes with Timing Belt upper cover by torquing all bolts per specifications. Mount the Crankshaft Pulley by aligning the notches then secure it with 95 nm torque followed by a 45° angle rotation and an additional 15° rotation. The Engine Mount and cylinder head cover should be placed back while the accessory belt and tensioner follow. The procedure concludes with removal of the transmission bolt then pulling out the km-6625 followed by transmission bolt reinstallation then j 28647-b removal followed by new air cleaner assembly installation and negative Battery Cable reconnection.

The first step in Timing Belt replacement should be to disconnect the negative cable from the battery. First remove the air cleaner assembly which enables installation of the engine support fixture (J 28647-B). Remove the accessory belt after you take out the accessory belt tensioner. The Crankshaft Pulley needs clockwise rotation to produce a pulley cover notch alignment. Before continuing install the flywheel locking device (KM-6625) as a crankshaft block then reinstall the transmission bolt. First remove the cylinder head cover and Engine Mount then proceed with the Crankshaft Pulley followed by Timing Belt upper cover and Engine Mount bracket together with the Timing Belt lower cover and Timing Belt center cover. The fixing rod (KM-6333) allows removal of the Timing Belt along with its tensioner and idler when operated while rotating the tensioner. To adjust the camshafts correctly install the locking tool (MK-6628) according to specifications after setting both sprocket faces level to each other. Place the right segment of locking tool (MK-6340) into the exhaust camshaft sprocket area and position the left section on the intake camshaft sprocket before necessary adjustments. First confirm the notched alignment between the crankshaft sprocket and cover, and then install the Timing Belt Tensioner along with its idler component before torquing them to specified values. The mechanic should install the Timing Belt before removing the fixing rod (KM-6333). The installation process requires the return of Timing Belt center cover, Timing Belt lower cover and Engine Mount bracket and Timing Belt upper cover. All installation torque specifications must be followed. Position the Crankshaft Pulley on its installation position with proper notches alignment before tightening all fasteners. Install the Engine Mount together with the cylinder head cover and proceed by putting on the accessory belt as well as accessory belt tensioner. The installation process ends with the removal of locking device km-6625 (KM-6625) followed by restoring of the transmission bolt then tightening before removing the engine support fixture j 28647-b (J 28647-B) to set the air cleaner assembly and complete the battery negative cable reattachment.

Rotate the crankshaft two full turns clockwise and loosen the coolant pump retaining bolts again.