Caution

When twisting cutter, keep an even downward pressure (4 — 5 kg) to prevent chatter marks.

Cut sections as follows

Section

Cutter

A

20°

B

45°

C

60°

***************************************** Refacing steps:

[A] Valve face indicates that valve seat is centered on valve face but is too wide.

Valve seat cutter set

Desired result

Use lightly

20° cutter

To reduce valve seat width to 1.0 mm (0.039 in).

60° cutter

B] Valve seat is in the middle of the valve face but too narrow.

Valve seat cutter set

Desired result

Use

45° cutter

To achieve a uniform valve seat width of 1.0 mm (0.039 in).

Valve seat is too narrow and right up near valve margin.

Valve seat cutter set

Desired result

Use

20° cutter, first

To center the seat and to achieve its width of 1.0 mm (0.039 in).

45° cutter

D) Valve seat is too narrow and is located down near the bottom edge of the valve face.

Valve seat cutter set

Desired result

Use

60° cutter, first

To center the seat and increase its width.

45° cutter

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