Valve Seat Refacing

Follow the retac- Valve seat cutlers/grinders or equivalent valve seat ing manufactur- refacing equipment are recommended to correct ore operating worn vajve scats.

instructions.

60"

If the contact area is too high on the valve, the seat must be lowered using a 32' flat cutter.

If the contact area is too low on the valve, the seat must be raised using a 60' interior cutter.

CONTACT TOO HIGH

CONTACT TOO LOW

OLD SEAT WIDTH

Ol D SEAT WIDTH

Re face me sea: with u 4b-degree cutter whenever a valve guide is replaced.

Use a 4b-degree cutter to remove any roughness or irregularities from the seat.

TOOLS:

Seat cutter, 27.5 mm (IN) Seat cutter, 24.5 mm (EX) Cutter holder, 4.0 mm

07780-0010200

07780-0010100

07781-0010500 or equivalent commercially available

ROUGHNESS

Use a 32-degree cutter to remove the top 1/4 of the existing valve seat material.

TOOLS:

Flat cutter, 27 mm (IN) Flat cutter, 24 mm (EX) Cutter holder. 4.0 mm

07780-0013300

07780-0012500

07781-0010500 or equivalent commercially available

OLD SEAT WIDTH

OLD SEAT WIDTH

Use a GO-degree cutler to remove the bottom 1/4 of the old seat.

TOOLS:

Interior cutter, 26 mm (IN) Interior cutter, 22 mm (EX) Cutter holder, 4.0 mm

07780-0014500

07780-0014202

07781-0010500 or equivalent commercially available

OLD SEAT WIDTH \

Using a 4b' seat cutter, cut the seal to the proper width.

Make sure that all pitting and irregularities are removed.

Refinish if necessary.

After cutting the seat, apply lapping compound to the valve face, and lap the valve using light pressure.

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