SPRING 4D4971 - Caterpillar

Do not turn the crankshaft or the camshaft while the camshaft gear is removed. If the front gear group is not correctly timed during installation, interference can occur between the pistons and the valves, resulting in damage to the engine.
Thoroughly clean the gasket material from the cylinder block and both sides of the plate.
Illustration 1 g01101567
If studs (24) are loose or the threads are damaged, install new studs (24) in the front plate. Apply Tooling (D) to the serrations of studs (24) . Install studs (24) in the front plate.
Install integral seal (25) on the dowel pins on the cylinder block.Note: Apply Tooling (C) to the bottom of integral seal (25) to fill the space at the cylinder block, the front housing, and the engine oil pan.
Install plate (22) on the dowel pins on the cylinder block. Install new locking bolts (23) (Marked "X") in order to fasten the front plate to the cylinder block. Tighten locking bolts (23) to a torque of 55 N m (41 lb ft).Note: Clean the old sealant from the bolts and apply Tooling (D) to the bolts.
Tighten locking bolts (23) again to a torque of 55 N m (41 lb ft).
Illustration 2 g01101565
Install stub shaft (18) . Apply Tooling (D) to the studs and the bolt for stub shaft (18) . Tighten nuts (19) and the bolt to a torque of 55 10 N m (41 7 lb ft).
Install stub shaft assembly (16) . Apply Tooling (D) to the studs and the bolt for stub shaft assembly (16) . Do not tighten nuts (17) and the bolt for stub shaft assembly (16) at this time. Nuts (17) and the bolt for stub shaft assembly (16) will need to be tightened when the backlash is adjusted.
Adjust the backlash between the camshaft gear and the adjustable idler gear assembly. The backlash should be 0.356 0.254 mm (0.014 0.010 inch). Refer to Testing and Adjusting, "Gear Group (Front) - Time" for the backlash adjustment procedure. Tighten nuts (17) and the bolt to a torque of 55 10 N m (41 7 lb ft).
Install stub shaft (20) . Apply Tooling (D) to bolts (21) . Install bolts (21) and tighten in a numeric sequence 1, 3, 4, 5, 2, 1, 2, 3, 4, 5, 1 to a torque of 55 10 N m (41 7 lb ft).
Illustration 3 g01101161
Use Tooling (A) to install the sleeve bearing in cluster gear assembly (13) .
Put cluster gear assembly (13) on the stub shaft. Ensure that Timing Marks (V) are aligned on the cluster gear assembly and the crankshaft gear.
Position plate (15) with