Valve Face - Inspect; Valve Face - Reface - Mitsubishi S6R Series Service Manual

1.5 Valve Face - Inspect

Inspect the valve face after the valve guide is inspected or
replaced. Lap the valve and valve seat whenever valve is
refaced or replaced.
1.5.1 Valve Margin - Inspect
Measure the valve margin. If the value exceeds the limit,
reface or replace the valve with a new one.
1.5.2 Seat Width - Inspect
Apply a thin lead-free coloring paste on the valve face, and
tap the valve face against valve seat with valve lapper to
check the contact condition. If the contact is not even, or
any defects are found, or if the value exceeds the specified
limit, reface or replace the valve or valve seat.
Note: Do not rotate the valve when pressing valve face coat-
ed with lead-free coloring paste against valve seat.
Nominal
Item
value
Valve seat
30°
angle
Valve
seat
2.3 mm
Seat width
[0.09 in.]
3.0 mm
Valve margin
[0.12 in.]

1.6 Valve Face - Reface

When the valve is re-used by refacing, use valve refacer.
Note:(a) Grind the valve face with valve refacer adjusted to
the specified angle.
(b) The valve margin is to be within the specified limit.
If the dimensions after refacing does not meet the
specified values, replace the valve with a new one.
Limit
Standard value
value
- -
2.18 to 2.44 mm 2.8 mm
[0.0858 to 0.09 in.] [0.1102 in.]
2.8 to 3.2 mm 2.5 mm
[0.1102 to 0.1260 in.] [0.098 in.]
Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
Seat width
Valve lapper
P/N:30091-08800
Good
Contact Condition Between Valve Seat and Valve
Valve margin
Valve sinkage
Valve Face - Inspect
Lapping
compound
Seat Width - Inspect
Bad
Valve refacer
Grind valve face
at specified angles.
Valve Face - Reface
6-5