ACTUATOR AS 1494889 - Caterpillar

Removal Procedure
Table 1
Required Tools    
Tool    Part Number    Part Description    Qty    
A     166-7441     Valve Seat Extractor Tool Group     1    
B (1)     9U-6898     Valve Seat Driver (Exhaust)     1    
9U-6897 Valve Seat Driver (Inlet)     1    
( 1 ) Part of 9U-7530 Engine Tool Group Start By:
Remove the inlet and exhaust valves.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 1 g01082582
Use Tooling (A) to remove valve seat insert (1) 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
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 2 g01079028
Lower the temperature of new valve seat insert (1) .
Use Tooling (B) to install the new valve seat insert 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.