4G1 ENGINE (E-W) -
Cylinder Head and Valves
11A-9-8
PWEE9520
E
Nov. 1995
Mitsubishi Motors Corporation
VALVE SEAT REPLACEMENT SERVICE
POINTS
(1) Cut the valve seat to be replaced from the inside to reduce
the wall thickness. Then, remove the valve seat.
(2) Rebore the valve seat hole in the cylinder head to match
the selected oversize valve seat diameter.
Valve seat hole diameters
Standard mm
SOHC
In-
Primary
0.30 O.S.
27.300 - 27.325
12-VALVE
take
0.60 O.S.
27.600 - 27.625
Secondary
0.30 O.S.
32.300 - 32.325
0.60 O.S.
32.600 - 32.625
Exhaust
0.30 O.S.
35.300 - 35.325
0.60 O.S.
35.600 - 35.625
SOHC
Intake
0.30 O.S.
28.300 - 28.321
16-VALVE
0.60 O.S.
28.600 - 28.621
<4G13>
Exhaust
0.30 O.S.
26.300 - 26.321
0.60 O.S.
26.600 - 26.621
SOHC
Intake
0.30 O.S.
30.300 - 30.321
16-VALVE
0.60 O.S.
30.600 - 30.621
<4G18>
Exhaust
0.30 O.S.
28.300 - 28.321
0.60 O.S.
28.600 - 28.621
DOHC
Intake
0.30 O.S.
31.300 - 31.325
0.60 O.S.
31.600 - 31.625
Exhaust
0.30 O.S.
27.800 - 27.825
0.60 O.S.
28.100 - 28.125
(3) Prevent galling of the cylinder head bore by cooling the
valve seat with liquid nitrogen before press-fitting it.
(4) Correct the valve seat to achieve the specified width and
angle (refer to VALVE SEAT CORRECTION SERVICE
POINTS).
PWEE9520-D
E
Aug. 2000
Mitsubishi Motors Corporation
Revised
Cut away
1EN0274
0.5 - 1.0 mm
0.5 - 1.0 mm
Valve seat
height
Oversize hole I. D.
1EN0275
Summary of Contents for 4G1 series
Page 2: ...11A 0 2 PWEE9520 E Nov 1995 Mitsubishi Motors Corporation NOTES ...
Page 4: ...4G1 ENGINE E W General Information 11A 0 4 PWEE9520 E Nov 1995 Mitsubishi Motors Corporation ...
Page 22: ...NOTES ...
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