140-3 SERIES
15-7
TESTING AND ADJUSTING CYLINDER HEAD
4. Finishing insert seat surface
1) Using tools C1, C3, and C4, finish the sur-
face of the insert seat to the dimensions
shown in the diagram right.
When selecting a pilot C5 to insert into
the valve guide, choose one that gives
no clearance.
2) Rub the seat surface with compound.
Width of finished face of exhaust valve insert and
width of contact with valve Unit: mm
5. Finish inspection
• Coat the seat surface of the new valve thinly
with red lead (minimum), insert it in the valve
guide, push lightly against the valve insert
surface, and rotate 10°. Check the valve in-
sert contact surface, and confirm that the
contact is uniform without any breaks.
•Or
Make marks with a pencil on the seat surface
of the new valve as shown in the diagram be-
low, insert it in the valve guide, push lightly
against the valve insert surface, and rotate
10°. Check that the pencil marks have been
erased uniformly around the whole circum-
ference.
Part No.
Width of finished
surface
Width of contact
with valve (when
using master valve)
6210-11-1320 (STD.)
6210-19-1320 (0.25 O.S.)
6210-18-1320 (0.50 O.S.)
6210-17-1320 (0.75 O.S.)
6210-16-1320 (1.00 O.S.)
A: 47.1 B: 1.5 C: 1.5 ± 0.2
6210-11-1321 (STD.)
6210-19-1321 (0.25 O.S.)
6210-18-1321 (0.50 O.S.)
6210-17-1321 (0.75 O.S.)
6210-16-1321 (1.00 O.S.)
A: 45.7 B: 2.5 C: 2.5 ± 0.2
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