Maintenance Service Data Of Basic Engine - Mitsubishi S12A2 Service Manual

Chapter 2 SERVICE DATA

1.2 Maintenance Service Data of Basic Engine

Item
Rocker bushing inside diameter
Rockers
Rocker shaft outside diameter
Valve stem outside diameter
Valve guide inside diameter
Valve
Clearance
Adjusting screw side
Between the
Bottom Face
of Valve
Bridge and
the Top Face Non adjusting side
of Valve
Rotator
Valve seat angle
Valve sinkage
Seat width
Valve margin
Inside diameter of valve seat
counterbore
Valve seat
and valve
Inlet
Outside of
valve seat
Exhaust
Valve seat interference
Free length
Squareness
Valve spring
Installed length/load (mm [in.]/N {kgf} [lbf])
Push rod Runout
2-4
Nominal
value
ø32 [1.26]
ø32 [1.26]
Inlet ø10 [0.39]
Exhaust ø10 [0.39]
ø10 [0.39]
30°
0
2.08
Inlet
[0.0819]
1.85
Exhaust
[0.0728]
2.9
Inlet
[0.114]
3.0
Exhaust
[0.118]
Inlet
Exhaust
Standard
0.03 [0.0012]
0.06 [0.0024]
Standard
0.03 [0.0012]
0.06 [0.0024]
A=1.5° or less
B=1.46 or less
Lf=67.5 [2.6575]
60.0 [2.36]/259 to 286
0.50 [0.0197] or less
Standard value Limit value
32.055 to 32.080 32.100
[1.2620 to 1.2630] [1.2638]
31.975 to 31.991 31.950
[1.2589 to 1.2595] [1.2579]
9.940 to 9.960 9.910
[0.3913 to 0.3921] [0.3902]
9.910 to 9.930 9.880
[0.3902 to 0.3909] [0.3890]
10.000 to 10.015 10.060
[0.3937 to 0.3943] [0.3961]
2.5 [0.0984]
1.5 [0.0591]
- 0.1 to 0.1
0.5 [0.0197]
[-0.0039 to 0.0039]
1.98 to 2.18
2.5 [0.0984]
[0.0780 to 0.0858]
1.75 to 1.95
2.3 [0.0906]
[0.0689 to 0.0768]
2.7 to 3.1
[0.1063 to 0.1220]
2.0 [0.098]
after refacing
2.8 to 3.2
[0.1102 to 0.1260]
58.000 to 58.030
58.09 [2.2870]
[2.2835 to 2.2846]
54.000 to 54.030
54.09 [2.1295]
[2.1260 to 2.1272]
58.100 to 58.130
[2.2874 to 2.2886]
58.130 to 58.160
[2.2886 to 2.2898]
58.160 to 58.190
[2.2898 to 2.2909]
54.100 to 54.130
[2.1299 to 2.1311]
54.130 to 54.160
[2.1311 to 2.1323]
54.160 to 54.190
[2.1323 to 2.1335]
0.070 to 0.130
[0.0028 to 0.0051]
67.5 [2.6575] 66.2 [2.6063]
B=2.3 [0.087]
over entire
length
{26.41 to 29.16}
[58.22 to 64.29]
Unit: mm [in.]
Remarks
Same for both inlet and
exhaust valves.
Seat width
Valve
Valve Valve
margin
seat angle sinkage
Single red line
Double red lines
Triple red lines
Double blue lines
Triple blue lines
Four blue lines
A
B
Lf
TIR