SEAL-PISTON 3E4280 - Caterpillar

Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 166-7441 Valve Seat Extractor Tool 1
B 1U-9170 Valve Seat Driver 1 Start By:
Remove the inlet and exhaust valves.
Illustration 1 g01082582
Use Tooling (A) to remove valve seat inserts (1). Installation Procedure
Illustration 2 g01079028Note: Do not machine the prefinished valve seat inserts in order to correct the valve stem projection. An excessive valve stem projection indicates that the valve seat insert is not seated or material was not cleaned from the bottom of the counterbore.
Lower the temperature of new valve seat inserts (1).
Use Tooling (B) to install the new valve seat inserts (1) in reverse order of removal.