GEAR-BEVEL 4480727 - Caterpillar

Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 157-3722 Valve Guide Driver 1 Start By:
Remove the inlet valves and the exhaust valves. Refer to Disassembly and Assembly, "Inlet and Exhaust Valves - Remove and Install".
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 1 g00632175
Typical example
Use Tooling (A) in order to remove the valve guides from the cylinder head.
Repeat the procedure for the remaining valve guides. Note: When new valve guides are installed, new valves and new valve seat inserts must be installed.
Remove the valve seat inserts. Refer to Disassembly and Assembly, "Inlet and Exhaust Valve Seat Inserts - Remove and Install". Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
A 157-3722 Valve Guide Driver 1
B 9U-6220 Stop Collar 1
C 157-3720 Valve Seat Cutter 1
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 2 g00632176
Typical example
Clean the parent bores in the cylinder head for all of the appropriate valve guides (4).
Put the valve guide in position. Carefully tap the valve guide in order to start the installation. Use Tooling (A) and Tooling (B) to seat the valve guide in the cylinder head.
Check the protrusion of the valve guides. The valve guides should protrude 12.35 to 12.65 mm (0.4862 to 0.4980 inch) above the valve spring recess.
Repeat the procedure to install the remaining valve guides.
Install the valve seat inserts. Refer to Disassembly and Assembly, "Inlet and Exhaust Valve Seat Inserts - Remove and Install". Note: After installing the valve guides and valve seat inserts, the valve guides must be reamed and the valve seat inserts must be cut to the finished diameter. The valve guides and valve seat inserts are cut and reamed in one operation. This procedure ensures the concentricity of the valve seat to the valve guide in order to create a good seal. Refer to Specifications, "Cylinder Head Valves" for the finished diameter of the valve guides and valve seat inserts.
Position Tooling (C) into the valve guide. Carefully turn the handle in a clockwise direction and gradually move the reamer into the valve guide until the valve guide is reamed to the finished size.
Continue to turn the handle in a clockwise direction in order to cut the valve seat insert. Remove the minimum amount of material in order to ensure a good valve seat. Keep the valve seat as narrow as possible.
Remove Tooling (C). Clean the debris from the valve guide and the valve seat. End By:
Install the inlet valves and the exhaust valves. Refer to Disassembly and Assembly, "Inlet and Exhaust Valves - Remove and Install".