Operation 3-22 To Correct A Valve Seat With A Valve Seat Cutter - Perkins New 1000 Series Workshop Manual

New 1000 Series
To correct a valve seat with a valve seat cutter
Special requirements
Description
Cutter (31° or 46°) for inlet and exhaust
valve seats and valve guide reamer
Caution: Valves must not be lapped.
The valve seats are cut and the valve guides are reamed in one operation with a special tool (A). The valve
seat and the guide are cut in one operation to ensure the concentricity of the valve seat to the valve guide. This
will ensure a good seal between the guide and its seat. New valves and new guides must be fitted each time
a new seat insert is fitted. Valves must not be lapped.
1 Before any work is done on the valve seats, new valve guides must be fitted, see Operation 3-19 and
Operation 3-20.
Caution: Ensure that the correct cutter is fitted, 31° or 46° valve seats may be fitted.
2 Select the relevant valve seat cutter, 31° or 46°, (A2) and the valve guide reamer (A3). Set the blades of the
cutters to the diameter of the valve seat to be cut. Fit the cutter onto the reamer and push the handle fully onto
the reamer. Ensure that the flat part of the reamer shank is towards the grub screw (A1) and tighten the grub
screw to secure the reamer to the handle. The blades of the reamer must not cut the valve guide when the
seat is cut.
1
2
3
A
Workshop Manual, TPD 1350E, Issue 4
This document has been printed from SPI². Not for Resale
Special tools
Part number
27610030
4
C040
3
Operation 3-22
Continued
71