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Workshop Manual, TPD 1458E, issue 3 - Perkins Confidential: Green 29
400 Series
Valve seat width
#
To inspect and to correct Operation 3-17
If the contact face (1) of the valve seat is more than the service limit, check the valve stem for wear, see
Operation 3-14 and the cylinder head to valve stem clearance, see Operation 3-15. If greater than the service
limit, use a seat cutter of 45° to correct the seat.
If the valve stem clearance exceeds the service limit, renew the valve.
If the bore in the cylinder head for the valves is worn, replace the cylinder head. If the valve seat in the cylinder
head is damaged or worn, cut a new seat if the valve depth will remain within tolerance.
Special tools
Description Part number
Valve seat cutter 27610030
Engine
Inlet valve Exhaust valve
Clearance mm (in) Clearance mm (in)
Standard Service limit Standard Service limit
403C-11 1,70 - 2,10 (0.0670 - 0.0830) 2,5 (0.098) 1,70 - 2,10 (0.0670 - 0.0830) 2,5 (0.098)
403C-15 1,66 - 1,87 (0.0653 - 0.0736) 2,5 (0.098) 1,66 - 1,73 (0.0653 - 0.0681) 2,5 (0.098)
404C-22
404C-22T
1,50 - 2,00 (0.0591 - 0.0790) 2,5 (0.098) 1,94 - 2,16 (0.0764 - 0.0850) 2,5 (0.098)
H1050
Contact
Width
45°
1
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