PULLEY GP-FAN DRIVE 7W5254 - Caterpillar

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Machine the plate assembly to the dimensions shown in Illustration 1.The plate assembly should be machined parallel to the horizontal centerline a distance (A) of 38 mm (1.5 in).004
The modification of the plate assembly will provide adequate clearance with the rocker arm stands.This will allow the valve guides CLOSEST TO THE EXHAUST MANIFOLD OUTBOARD GUIDES to be replaced without draining the engine coolant or removing the rocker arm shaft assembly.1U-9570 Dowel Puller Group
1U-9572 Extractor
The 1U-9572 Extractor is part of 1U-9570 Dowel Puller Group.
Illustration 2 provides information for modifying 1U-9572 Extractor: Dimension (B) 17.53 mm (.690 in) to 17.63 mm (.694 in). Dimension (C) 38 mm (1.5 in).006
Machine 1U-9572 Extractor to the dimensions shown in Illustration 2.The inside diameter (B) of the slotted end of 1U-9572 Extractor must be enlarged from a diameter of 17.53 mm (.690 in) to 17.63 mm (.694 in).The increased diameter (C) should be maintained to the end of the slots or 38 mm (1.5 in).006
The increased diameter will allow 1U-9572 Extractor to fit over the valve guide.1U-9577 Forcing Collar
The 1U-9577 Forcing Collar is part of 1U-9570 Dowel Puller Group.
Illustration 3 provides information for machining 1U-9577 Forcing Collar: Instruction (2) to "Remove This Area". Dimension (D) 46 mm (1.8 in). Dimension (E) 57.0 mm (2.24 in). Notice (3) of "Knurled End".007
Machine 1U-9577 Forcing Collar to the dimensions shown in Illustration 3.The outside diameter of 1U-9577 Forcing Collar must be machined to a reduced diameter (D) of 46 mm (1.8 in) and to a length (E) of 57.0 mm (2.24 in). DO NOT machine the knurled end (3) of 1U-9577 Forcing Collar.007
The modification of 1U-9577 Forcing Collar will provide adequate clearance between the outside of 1U-9577 Forcing Collar, cylinder head bridge dowel, and the fuel injection nozzle adapter in the cylinder head.9U-7349 Valve Guide Driver Assembly
Illustration 4 provides information for machining 9U-7349 Valve Guide Driver Assembly: Instruction (4) to "Remove This Area". Dimension (F) 13 mm (.5 in).008
Machine 9U-7349 Valve Guide Driver Assembly end to the seating shoulder a length (F) of 13 mm (.5 in).008
The modification of the driver assembly will provide adequate clearance between the pilot end of the tool and the end of the valve when installing a valve guide in the cylinder head with the valves in place.Using The Modified Tooling To Install Valve Guides Without Removing The Cylinder Head
This repair does not require the removal of the cylinder head.Refer to the Service Manual for the procedures to remove the required parts to install the exhaust guides.1. Remove the cylinder head valve cover, base, and related components.2. Remove the engine exhaust brake (if equipped).3. Remove the rocker shaft assemblies and bridges.4. Rotate the crankshaft until pistons:* Number 1 and number 6, or* Number 3 and number 4, or* Number 2 and number 5 are at the top of their travel.Two cylinders may be worked on at each position.When the pistons are positioned at the top of their travel position, the piston acts as a support to hold the valves in place. The