California Air Tools 3010 Service Manual download pdf (Page 133)

100

101

ENGINE TOP END 5-17

Valves

Operating Procedures

•

Clean the seat area carefully.

•

Coat the seat with machinist’s dye.

•

Fit a 45° cutter into the holder and slide it into the valve

guide.

•

Press down lightly on the handle and turn it right or left.

Grind the seating surface only until it is smooth.

CAUTION

Do not grind the seat too much. Overgrinding will

reduce valve clearance by sinking the valve into the

head. If the valve sinks too far into the head, it will

be impossible to adjust the clearance, and the cylin-

der head must be replaced.

•

Measure the outside diameter of the seating surface with

a vernier caliper.

If the outside diameter of the seating surface is too small,

repeat the 45° grind until the diameter is within the spec-

ified range.

Widened Width [A] of engagement by machining with

45° cutter

Ground Volume [B] by 32° cutter

32° [C]

Correct Width [D]

Ground Volume [E] by 60° cutter

60° [F]

•

Measure the outside diameter of the seating surface with

a vernier caliper.

If the outside diameter of the seating surface is too small,

repeat the 45° grind [A] until the diameter is within the

specified range.

Original Seating Surface [B]

NOTE

○

Remove all pittings of flaws from 45° ground surface.

○

After grinding with 45° cutter, apply thin coat of machin-

ist’s dye to seating surface. This makes seating surface

distinct and 32° and 60° grinding operation easier.

○

When the valve guide is replaced, be sure to grind with

45° cutter for centering and good contact.

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California Air Tools 3010 Service Manual Page 133

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