Mitsubishi 4G1 series General Information

4G1 ENGINE (E-W) -
Cylinder Head and Valves
11A-9-8
PWEE9520
E
Nov. 1995Mitsubishi 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. 2000Mitsubishi Motors Corporation Revised
Cut away
1EN0274
0.5 - 1.0 mm
0.5 - 1.0 mm
Valve seat
height
Oversize hole I. D.
1EN0275

Mitsubishi 4G1 series Specifications

General

Brand	Mitsubishi
Model	4G1 series
Category	Engine
Language	English