Dodge D250 1990 Service Manual page 355

Alternative Repair Procedures
Page9K-24
Base Engine Components
DODGE Turbo Diesel
Valve Seat Insert - Pocket Machining Dimensions, Exhaust
Seat
A = 8.029 + 0.010mm [.3161 ± .0004 inch] diameter
B = 10.20 ± 0.10mm [.4015 + .004 inch]
C = 43.650 ± 0.013mm [1.7185 ± .0005 inch] diameter
D = 0.40mm [.0157 inch] maximum radius
E = 3.2 micrometers [128 microinch] surface finish
(Valve Seat Insert Part Number 4429111)
|p Valve Seat Insert Staking Tool
Press service seats into the machined pockets. Stake the valve
seats into the pockets.
Grind the valve seats lightly to ensure proper seat angle.
0 0 " 0 0 . 0 0
d
Seat Angle
Intake: 30 degrees
Exhaust: 45 degrees