ENGINE AR 2458376 - Caterpillar

Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Ensure that number one piston is at top dead center on the compression stroke. Refer to System Operation, Testing and Adjusting, "Finding Top Center for No.1 Piston" for the correct procedure.
Illustration 6 g02437698
Ensure that Tooling (E) is installed in Hole (X) in the cylinder block. Use Tooling (E) in order to lock the crankshaft in the correct position. Refer to System Operation, Testing and Adjusting, "Finding Top Center Position for No.1 Piston" for the correct procedure.
Ensure that the camshaft gear and the key are clean and free from wear and damage.
If necessary, install the key into the nose of the camshaft. Note: Ensure that the key is squarely seated.
Illustration 7 g02437699
Illustration 8 g02437701
Alignment of timing marks
Align the keyway in camshaft gear (3) with the key in the camshaft. Install camshaft gear onto the camshaft. Ensure that the timing marks on gear (3), gear (6), gear (7) and gear (8) are in alignment and that the mesh of the gears is correct. Refer to Illustration 8.
Illustration 9 g02437702
Illustration 10 g02437697
Install Tooling (C) through Hole (X) in the camshaft gear into the front housing. Install washer (9) and bolt (10) to camshaft gear (3).
Remove Tooling (E) and Tooling (C).
Install a new O-ring seal (2) to plug (1). Install the plug into Hole (Y) in the cylinder block. Refer to Illustration 10. Tighten plug (1) to a torque of 21 N m (186 lb in).
When bolt (10) is a 8.8 Grade. Tighten bolt (10) to a torque of 95 N m (70 lb ft). When bolt (10) is a 10.9 Grade. Tighten bolt (10) to a torque of 120 N m (89 lb ft).
Use Tooling (F) in order to measure the backlash for gear (3), gear (6), gear (7) and gear (8). Refer to Specifications, "Gear Group (Front)" for further information.
Use Tooling (F) in order to measure the end play of camshaft gear (1). Refer to Specifications, "Camshaft" for further information.
Lubricate the teeth of the gears with clean engine oil.
Failure to ensure that the crankshaft is set in the safe position will result in interference between the pistons and the valves. Interference between the pistons and the valves will result in damage to the engine.
Use Tooling (A) in order to rotate the crankshaft in a clockwise direction and position the crankshaft at the safe position. Refer to System Operation, Testing and Adjusting, "Position the Valve Mechanism Before Maintenance Procedures" for the correct procedure.
Illustration 11 g02009115
Ensure that the guides for the pushrods are correctly positioned on the threaded inserts (4). Use Tooling (B) in order to tighten threaded inserts (4) on all rocker arms (5). Tighten the threaded inserts to a torque of 30 N m (266 lb in). Note: When the threaded insert is tightened, the threaded insert must be correctly seated into the cup for the pushrod.
The engine should not be operated for a period 30 minutes after the threaded inserts on all the rocker arms have been tightened. This period will allow