Valve Seat Reconditioning Procedure; Valve Seat Replacement Procedure; Valve Guide Replacement - Mitsubishi 6A1 series User Manual

0.9 - 1.3 mm
65_
15_
44_
0.5 - 1.0 mm
Cut away
Valve seat
height
Oversize valve seat
hole diameter
E
Mitsubishi Motors Corporation
6A1 ENGINE (E - W) -

VALVE SEAT RECONDITIONING PROCEDURE

(1) Before correcting the valve seat, check the clearance
0.9 - 1.3 mm
65_
(2) Using the appropriate special tool or seat grinder, correct
(3) After correcting the valve seat, lap the valve and valve
15_
44_
1EN0105

VALVE SEAT REPLACEMENT PROCEDURE

(1) Cut the valve seat to be replaced from the inside to thin
(2) Rebore the valve seat hole in the cylinder head to a
0.5 - 1.0 mm
1EN0274
1EN0275
(3) Before fitting the valve seat, either heat the cylinder head
(4) Correct the valve seat to the specified width and angle.

VALVE GUIDE REPLACEMENT

(1) Force the valve guide out toward the cylinder block using
(2) Machine the valve guide hole in the cylinder head to
Feb. 1997
Cylinder Head and Valves
between the valve guide and valve. If necessary, replace
the valve and/or 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 VALVE SEAT in INSPECTION).
the wall thickness. Then, remove the valve seat.
selected oversize valve seat diameter.
Intake valve seat hole diameter
0.3 O.S. <SOHC>: 29.80 - 29.82 mm
<MIVEC>: 32.30 - 32.32 mm
0.6 O.S. <SOHC>: 30.10 - 30.12 mm
<MIVEC>: 32.60 - 32.62 mm
Exhaust valve seat hole diameter
0.3 O.S. <SOHC>: 27.80 - 27.82 mm
<MIVEC>: 29.80 - 29.82 mm
0.6 O.S. <SOHC>: 28.10 - 28.12 mm
<MIVEC>: 30.10 - 30.12 mm
up to approximately 250_C or cool the valve seat in liquid
nitrogen, to prevent the cylinder head bore from galling.
a press.
the size of the oversize valve guide to be installed.
Caution
D
Do not use the valve guide of the same size as
the removed one.
Valve guide hole diameters in cylinder head
0.05 O.S.: 11.05 - 11.07 mm
0.25 O.S.: 11.25 - 11.27 mm
0.50 O.S.: 11.50 - 11.52 mm
PWEE9622
11A-12-9