1. If necessary, use tool (A) to ensure piston #1 is at top dead center (TDC) of the compression stroke. For the correct procedure, see System Operation, Testing and Adjustment, "Finding Piston #1 at TDC".
CAT Comm Adapter 3 478-0235 Diagnostics for Caterpillar
2. Ensure tool (B) is installed in the bore (Y) of the cylinder block. Use tool (B) to lock the crankshaft into place.
Note: Do not use excessive force when installing tool (B). Do not use tool (B) to hold the crankshaft in place during repairs.
3. Ensure tool (C) is installed in the bore (X) of the camshaft gear (1).
4. Clean the idler gear (3) and inspect it for wear or damage. For more information, see the technical specifications, "Gear Assembly (Front)". Replace the idler gear if necessary.
5. Clean the hub (11) and inspect it for wear or damage. For more information, please refer to the technical specifications, "Gear Assembly (Front)". Replace the wheel hub if necessary.
6. Lubricate the wheel hub (11) with clean engine oil. Slide the wheel hub (11) into the idler gear (3). Ensure the timing mark faces the front of the idler gear.
Note: The idler gear must be tilted during installation. Ensure the holes in the wheel hub are aligned with the holes in the cylinder block.
8. Clean the plate (9) and inspect it for wear or damage. Replace the plate if necessary.
9. Lubricate the plate (9) with clean engine oil. Align the holes in the plate (9) and the wheel hub (11). Install the plate in its original orientation. 10. Install bolt (10).
11. Remove tools (B) and (C).
Note: Before removing tools (B) and (C), ensure the timing marks are aligned.
12. Tighten bolt (10) to a torque of 44 N·m (32 lb ft).
13. Use tool (D) to measure the end clearance of the camshaft gear. For more information, see Technical Specifications, "Gear Assembly (Front)".
14. Use tool (D) to measure the tooth backlash between the idler gear and the camshaft gear. For more information, see Technical Specifications, "Gear Assembly (Front)".
15. Use tool (D) to measure the tooth backlash between the idler gear and the crankshaft gear. For more information, please refer to the technical specifications.
"Gear Assembly (Front)
5
16. Install the new O-ring (4) onto the plug (5). Install the plug (5) onto the cylinder block. Tighten the plug (5) to a torque of 21 N·m (186 lb in).
17. Lightly lubricate all gears with clean engine oil.
End:
a. Install the fuel injection pump gear. Please
refer to Disassembly and Assembly, "Fuel Pump Gear - Installation".
b. Adjust the engine valve clearance. Please refer to System Operation, Testing and Adjustment, "Engine Valve Clearance - Inspection/Adjustment" for the correct procedure.
