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 TM 5-2420-224-34
CYLINDER HEAD REPAIR (CONT)
8.
CHECK valve seat COUNTERBORES (5) for
irregularity USING GAUGE and irregularity
control DEVICE. MAXIMUM IRREGULARITY
between valve guide (3) and valve seat
counterbore (5) is 0.0012 in. (0.03 mm).
USING following TABLE, CHECK WIDTH of
9.
each valve seat COUNTERBORE (5). IF
NECESSARY, REFACE counterbore (step 13).
Valve Seat Counterbores
OM 352A (from 812344)
OM 352 (all) and OM 352A
(through 812343)
Intake
Intake
In.
In.
In.
In.
(mm)
(mm)
(mm)
(mm)
1.339
1.575
1.392-1.394
Diameter A
1.708-1.710
(34.0)
(40.0)
(43.370-43.400)
(35.379-35.400)
4450'-45
45
29 55'-30
Valve Seat Angle B
45
0.071-0.118
0.051-0.094
0.063-0.079
0.079-0.098
Seat Width C
(1.8-3.0)
(2.0-2.5)
(1.3-2.4)
(1.6-2.0)
0.114-0.126
Valve Seat Insert Recess
0.142-0.154
0.110-0.118
0.102-0.110
(2.9-3.2)
(2.6-2.8)
(3.6-3.9)
from Cylinder Head D
(2.8-3.0)
0.154-0.161
Reference Dimension E
0.154-0.161
--
--
(3.9-4.1)
(3.9-4.1)
0.028-0.047
Valve Face Recess from
0.028-0.047
0.028-0.047
0.028-0.047
(0.7-1.2)
(0.7-1.2)
Cylinder Head
(0.7-1.2)
(0.7-1.2)
0.0012
Maximum Concentricity
0.0012
0.0012
0.0012
(0.03)
(0.03)
Deviation of Valve Seat
(0.03)
(0.03)
to Valve Guide
*If valve seat machining causes dimension to be exceeded, valve seat insert must be replaced.
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