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ENGINE TOP END 3-29
Valves
.
Measure the outside diameter of the seating surface with
a vernier caliper.
*If the outside diameter of the seating surtace 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 [8] by 32° cutter
32° [C]
Correct Width [0]
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 surtace is too small,
repeat the 45° grind [A] until the diameter is within the
specified range.
Original Seating Surface [8]
NOTE
o
Remove all pittings of flaws from 45° ground surface.
OAffer 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.
o When the valve guide is replaced, be sure to grind with
45° cutter for centering and good
contact.
*If the outside diameter [A] of the seating surface is too
large, make the 32° grind described below.
*If the outside diameter of the seating surface is within the
specified range, measure the seat width as described be-
low.
.
Grind the seat at a 32° angle [8] until the seat 0.0.
is
within the specified range.
OTo make the 32° grind, fit a 32° cutter into the holder, and
slide it into the valve guide.
OTurn the holder one turn at a time while pressing down
very lightly. Check the seat after each turn.
CAUTION
The 32° cutter removes
material very quickly.
Check the seat outside diameter frequently to pre-
vent overgrinding.
OAfter making the 32° grind, return to the seat 0.0. mea-
surement step above.
.
To measure the seat width, use a vernier caliper to mea-
sure the width of the 45° angle portion of the seat at sev-
eral places around the seat.
*If the seat width is too narrow, repeat the 45° grind until
the seat is slightly too wide, and then return to the seat
0.0. measurement step above.
@)
GE150119S1
C
GE150121S1
C
GE150122S1
C

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