PUMP GP-GOV, FUEL INJ & TFR 4W8679 - Caterpillar

Removal Procedure
Table 1
Required Tools    
Tool    Part Number    Part Description    Qty    
A     166-7441     Valve Seat Extractor Tool Group     1    Start By:
Remove the inlet and 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 g01042314
Use Tooling (A) to remove the valve seat inserts from the cylinder head.
Clean the bores in the cylinder head for the valve seat inserts. Remove any rough areas from the bores.Installation Procedure
Table 2
Required Tools    
Tool    Part Number    Part Description    Qty    
B (1)     9U-6898     Valve Seat Driver (Exhaust)     1    
9U-6897 Valve Seat Driver (Inlet)     1    
( 1 ) Part of 9U-7530 Engine Tool Group
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 2 g01042315
Lower the temperature of new valve seat inserts (1) .
Use Tooling (B) to install the new valve seat inserts in the cylinder head.Note: Do not machine the prefinished valve seat inserts in order to correct the valve projection. Excessive valve projection indicates that the valve seat insert is not seated or material was not cleaned from the bottom of the counterbore.End By: Install the inlet and exhaust valves. Refer to Disassembly and Assembly, "Inlet and Exhaust Valves - Remove and Install".