WRENCH 1U9725 - Caterpillar

Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Note: The fuel injection pump must remain locked until the procedure instructs you to unlock the fuel injection pump.
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If necessary, use Tooling (A) to ensure 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.
Ensure that Tooling (C) is installed in Hole (Y) in the cylinder block. Use Tooling (C) to lock the crankshaft in the correct position.Note: Do not use excessive force to install Tooling (C). Do not use Tooling (C) to hold the crankshaft during repairs.
Ensure that all the components of the front gear group are clean and free from wear of damage. If necessary, replace any components that are worn or damaged.
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Install camshaft gear (1). Loosely tighten the bolt for camshaft gear (1). Refer to Disassembly and Assembly, "Camshaft Gear - Remove and Install" for the correct procedure.
Install Tooling (B) through Hole (X) in camshaft gear (1) into the front housing.
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Alignment of timing marks
Install idler gear (8). Ensure that the timing mark on gear (1) and the timing mark on gear (8) are aligned. Ensure that the mesh of the gears is correct. Tighten the bolts for idler gear (8) to a torque of 44 N m (32 lb ft). Refer to Disassembly and Assembly, "Idler Gear - Remove and Install" for the correct procedure.
Tighten the bolt for camshaft gear (1) to a torque of 95 N m (70 lb ft).
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.
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Install fuel injection pump gear (2). Ensure that the timing marks on gear (2) and the timing marks on gear (8) are aligned. See Illustration 9. Ensure that the mesh of the gears is correct. Refer to Disassembly and Assembly, "Fuel Injection Pump Gear - Install" for more information.
Remove Tooling (B) and Tooling (C).
Use Tooling (D) to measure the end play of camshaft gear (1). Refer to Specifications, "Camshaft" for more information.
Use Tooling (D) to measure the backlash for gear (1), gear (2), and, gear (8) is within specified values. Refer to Specifications, "Gear Group (Front)" for further information.
Adjust the engine valve lash. Refer to System Operation, Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust" for the correct procedure.
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Install a new O-ring seal (3) to plug (4). Install plug (4) to the cylinder block. Tighten locking bolt (5) against the spacer to a torque of 21 N m (186 lb in).
Lubricate each gear with clean engine oil.End By:
Install the valve mechanism cover.
Install the front cover.