IDLER ASSEM. 1M3121 - Caterpillar

Illustration 5 g02085993
If necessary, install Tooling (D) into Hole (W) in the cylinder block. Use Tooling (D) 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. Note: Do not use excessive force to install Tooling (D). Do not use Tooling (D) to hold the crankshaft during repairs.
Ensure that all of the components of the front gear group are clean and free from wear and damage. If necessary, replace any components that are worn or damaged.
Illustration 6 g03453530
Install camshaft gear (5). Loosely install bolt (10) and washer (9) for the camshaft gear. Refer to Disassembly and Assembly, "Camshaft Gear - Remove and Install" for the correct procedure.
Illustration 7 g03453527
Install Tooling (B) through Hole (X) in camshaft gear (5) into the front housing.
Illustration 8 g03453531
Illustration 9 g03453528
Alignment of timing marks
Install idler gear (6). Ensure that the timing marks on gear (5), gear (5), gear (7), and gear (8) are in alignment. Refer to Disassembly and Assembly, "Idler Gear - Remove and Install". Check the end play of the idler gear. Refer to Specifications, "Gear Group (Front)" and refer to Disassembly and Assembly, "Idler Gear - Remove and Install" for the correct procedure.
Illustration 10 g03453532
Ensure that the fuel injection pump is locked in the correct position. Refer to Disassembly and Assembly, "Fuel Injection Pump - Install" for the correct procedure.
Remove Tooling (B) and Tooling (C).
Illustration 11 g03453533
When a 8.8 Graded bolt (10) is installed. Tighten the bolt to a torque of 95 N m (70 lb ft). When a 10.9 Graded bolt (10) is installed. Tighten the bolt to a torque of 120 N m (89 lb ft).
Check the end play of the camshaft gear. Refer to Specifications, "Camshaft" for more information.
Illustration 12 g03453534
Use Tooling (F) in order to measure the backlash for gear (5), gear (6), gear (7), and gear (8). Refer to Specifications, "Gear Group (Front)" for more information.
Lubricate each gear with clean lubricating engine oil.
If necessary, use Tooling (A) in order to rotate the crankshaft so that number one piston is at top dead center on the compression stroke. Refer to System Operation, Testing and Adjusting, "Finding Top Center Position for No.1 Piston" for the correct procedure. If necessary, use Tooling (D) in order to lock the crankshaft so that number one piston is at top dead center on the compression stroke.
Remove Tooling (D).
Failure to ensure that the crankshaft is positioned at 60 degrees after top dead center 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 60 degrees after top dead center.
Illustration 13 g03453525
Use Tooling (E) in order to tighten threaded inserts (4) on all rocker arms (3). Tighten the threaded inserts to a torque of 30 N m (265 lb in). Note: When the threaded insert is tightened, the threaded insert must be seated