Mitsubishi S6R Series Service Manual page 99

1.8.3 Valve Seat - Install
(1) Before installing the valve seat, measure the inside
diameter of valve seat counterbore in cylinder head and
the outside diameter of valve seat to make sure that the
interference is within the range of standard value. If the
value exceeds the standard, use the oversize valve seat.
Item
Valve seat
inside diameter of counterbore
Valve
seat outside diameter
Valve seat interference
Inside diameter of
valve seat counterbore
60.03 mm [2.3634 in.] or less
More than 60.03 mm [2.3634 in.]
More than 60.06 mm [2.3646 in.]
(2) Cool the valve seat at least for 4 minutes in liquid nitro-
gen and cool the cylinder head to a room temperature.
(3) Install the valve seat into the cylinder head with valve
seat caulking tool.
Standard
0.03 mm
[0.0012 in.]
0.06 mm
[0.0024 in.]
Applicable valve seat
Standard
0.03 mm [0.0012 in.]
0.06 mm [0.0024 in.]
Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
If the inside diameter of valve seat counterbore in cylin-
der head exceeds the limit, replace the cylinder head
with a new one.
Note: Oversized valve seats are available in 0.03 and 0.06
mm [0.0012 and 0.0024 in.] sizes.
Standard value
60.000 to 60.030 mm
[2.3622 to 2.3634 in.]
60.100 to 60.130 mm
[2.3661 to 2.3673 in.]
60.130 to 60.160 mm
[2.3673 to 2.3685 in.]
60.160 to 60.190 mm
[2.3685 to 2.3697 in.]
0.070 to 0.130 mm
[0.0028 to 0.0051 in.]
Cylinder head
60°
Same size on both inlet and exhaust sides
Valve seat
Limit value Remarks
60.09 mm
[2.3657 in.]
- 2 lines, brown
- 3 lines, brown
- 4 lines, brown
-
8 [0.31]
3.6 [0.14]
Valve seat fitting
bore inside diameter
Valve seat
outside diameter
Valve Seat Counterbore
Valve seat installer
assembly
P/N:37591-04010
Valve Seat - Install
-
-
Unit: mm [in.]
6-7