Valve Seat Correction Service Points; Valve Seat Replacement Service Points - Mitsubishi 4G1 series Workshop Manual

0.9 - 1.3 mm
0.9 - 1.3 mm
_
65
_
15
_
44
0.5 - 1.0 mm
Cut away
Valve seat
height
Oversize hole I. D.
E
E
Mitsubishi Motors Corporation
Mitsubishi Motors Corporation
4G1 ENGINE (E - W) -

VALVE SEAT CORRECTION SERVICE POINTS

(1) Before correcting the valve seat, check the clearance
_
65
(2) Using the appropriate special tool or seat grinder, correct
(3) After correcting the valve seat, lap the valve and valve
_
44
_
15
VALVE SEAT REPLACEMENT SERVICE
POINTS
(1) Cut the valve seat to be replaced from the inside to reduce
(2) Rebore the valve seat hole in the cylinder head to match
0.5 - 1.0 mm
Valve seat diameters
1EN0274
1EN0275
(3) Prevent galling of the cylinder head bore by cooling the
(4) Correct the valve seat to achieve the specified width and
Nov. 1995
Dec. 1998
Cylinder Head and Valves
between the valve guide and valve. If necessary, replace
the valve guide.
the valve seat to achieve the specified seat width and
angle.
seat using lapping compound. Then, check the valve stem
projection (refer to 5. VALVE SEATS in INSPECTION).
the wall thickness. Then, remove the valve seat.
the selected oversize valve seat diameter.
SOHC In- Primary
12-VALVE take
Secondary
Exhaust
SOHC Intake
16-VALVE
<4G13>
Exhaust
SOHC Intake
16-VALVE
<4G18>
Exhaust
DOHC Intake
Exhaust
valve seat with liquid nitrogen before press-fitting it.
angle (refer to VALVE SEAT CORRECTION SERVICE
POINTS).
PWEE9520
PWEE9520-A
11A-9-7
Standard mm
0.30 O.S. 27.300 - 27.325
0.60 O.S. 27.000 - 27.625
0.30 O.S. 32.300 - 32.325
0.60 O.S. 32.600 - 32.625
0.30 O.S. 35.300 - 35.325
0.60 O.S. 35.600 - 35.625
0.30 O.S. 28.300 - 28.321
0.60 O.S. 28.600 - 28.621
0.30 O.S. 26.300 - 26.321
0.60 O.S. 26.600 - 26.621
0.30 O.S. 30.300 - 30.321
0.60 O.S. 30.600 - 30.621
0.30 O.S. 28.300 - 28.321
0.60 O.S. 28.600 - 28.621
0.30 O.S. 31.300 - 31.325
0.60 O.S. 31.600 - 31.625
0.30 O.S. 27.800 - 27.825
0.60 O.S. 28.100 - 28.125
Revised