PILOT AS 4476490 - Caterpillar

Installation Procedure (Early Heavy-Duty Idler Gear)
Table 1
Required Tools
Tool Part Number Part Description Qty
A 230-6284 Timing Pin (Camshaft) 1
B 230-6283 Timing Pin (Crankshaft) 1
C 9U-7324 Indicator Bracket 1
7H-1942 Dial Indicator 1
3S-3268 Indicator Contact Point 1
7H-1940 Universal Attachment 1
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Ensure that number one piston is at the top center position on the compression stroke. Refer to Systems Operation, Testing and Adjusting, "Finding Top Center Position for No. 1 Piston".
Illustration 1 g01473492
Alignment of timing marks
Ensure that Tooling (A) is installed into Hole (X) in camshaft gear (1).
Ensure that Tooling (B) is installed in Hole (Y) in the cylinder block. Use Tooling (B) in order to lock the crankshaft in the correct position.
Illustration 2 g01473904
Typical example
Clean the assembly of idler gear (2) and inspect the assembly of the idler gear for wear or damage. Refer to Specifications, "Gear Group (Front)" for more information. If necessary, replace the assembly of the idler gear.
Lubricate the bearings in the assembly of idler gear (2) with clean engine oil.
Illustration 3 g01473909
Typical example
Align the timing mark on idler gear (2) with the timing mark on the camshaft gear. Refer to Illustration 1. Install the assembly of idler gear (2) into the recess in the timing case. Ensure that the identification mark TOP is upward. Note: The idler gear must be tilted during installation. Ensure that the holes in the assembly of the idler gear are aligned with the holes in the cylinder block.
Install bolts (3). Tighten the bolts to a torque of 44 N m (32 lb ft).
Illustration 4 g01269937
Checking end play by using a dial indicator group
Use Tooling (C) in order to check the end play of idler gear (2). Refer to Specifications, "Gear Group (Front)" for more information.
Use Tooling (C) in order to check the backlash between the idler gear and the camshaft gear. Refer to Specifications, "Gear Group (Front)" for more information.
Use Tooling (C) in order to check the backlash between the idler gear and the crankshaft gear. Refer to Specifications, "Gear Group (Front)" for more information.
Lightly lubricate all of the gears with clean engine oil. End By:
Install the fuel injection pump gear. Refer to Disassembly and Assembly, "Fuel Pump Gear - Install".
If the engine is equipped with an air compressor, install the air compressor. Refer to Disassembly and Assembly, "Air Compressor - Remove and Install".
If the engine is equipped with a vacuum pump, install the vacuum pump. Refer to Disassembly and Assembly, "Vacuum Pump - Remove and Install".
If the engine is equipped with an accessory drive, install the accessory drive. Refer to Disassembly and Assembly, "Accessory Drive - Remove and Install".