Mitsubishi S6R Series User Manual

6-7
Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
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.
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.
(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.
Valve Seat Counterbore
Valve Seat - Install
Item Standard value Limit value Remarks
Val v e se a t
inside diameter of counterbore
60.000 to 60.030 mm
[2.3622 to 2.3634 in.]
60.09 mm
[2.3657 in.]
-
Va lv e
seat outside diameter
Standard
60.100 to 60.130 mm
[2.3661 to 2.3673 in.]
- 2 lines, brown
0.03 mm
[0.0012 in.]
60.130 to 60.160 mm
[2.3673 to 2.3685 in.]
- 3 lines, brown
0.06 mm
[0.0024 in.]
60.160 to 60.190 mm
[2.3685 to 2.3697 in.]
- 4 lines, brown
Valve seat interference
0.070 to 0.130 mm
[0.0028 to 0.0051 in.]
--
Inside diameter of
valve seat counterbore
Applicable valve seat
60.03 mm [2.3634 in.] or less Standard
More than 60.03 mm [2.3634 in.] 0.03 mm [0.0012 in.]
More than 60.06 mm [2.3646 in.] 0.06 mm [0.0024 in.]
60°
Same size on both inlet and exhaust sides
Valve seat fitting
bore inside diameter
Valve seat
outside diameter
Cylinder head
Unit: mm [in.]
3.6 [0.14]
8 [0.31]
11.6
+0.1 0
[0.457
+0.004 -0 ]
Valve seat
Valve seat installer
assembly
P/N:37591-04010

Mitsubishi S6R Series Specifications

General

Brand	Mitsubishi
Model	S6R Series
Category	Engine
Language	English