Order of execution
1. Any valve seat insert worn to the limit must be replaced at room temperature by shearing the wall as shown in Figure A.
2. After removing the old valve seat, it is necessary to bore out the seat for the oversized valve seat.
3. Heat the cylinder head to 250°C and press in a new oversize valve seat. The valve seat must be at room temperature when pressed in. After installing a new valve seat, the valve must be lapped.
Description | Size increase, mm | size mark | Saddle height, mm | Diameter of a nest in a head of cylinders, mm |
Inlet valve seat | 0,3 | 30 | 5,1-5,3 | 29,80-29,821 |
0,6 | 60 | 5,4-5,6 | 30,10-30,121 | |
Exhaust valve seat | 0,3 | 30 | 5,9-6,1 | 27,30-27,321 |
0,6 | 60 | 6,2-6,4 | 27,60-27,621 |