Valve Seats - General - Dodge D250 1990 Service Manual

Base Engine Components
DODGETurbo Diesel
Alternative Repair Procedures
Page9K-19
Install the valve guides as illustrated.
Lubricate with oil and press in the guides to dimension A
protrusion above the cylinder head.
Ream the tores to the dimension B size.
A = 12.25 ± 0.50mm [0.4823 ± 0.020 inch]
B = 8.029 ± 0.010mm [0.3161 ±0.0004 Inch]
Valve Seats - General
On cylinder head which have Integral valve seats, the seats can
be reground once only. Integral seats that have been
previously reground must be replaced with service seats.
Seats that have been previously reground should have been
identified with one X stamped into the head casting as shown.
Two X's stamped on the head Indicate service seats have been
Installed. Service seats can be reground.
Caution: On the integral seat head, if 0.254mm [.010 inch]
or more has been removed from the head combustion
surface, service seats must be installed.
Note: To determine if the head has been previously resurfaced, f ^
before calculating valve depth, proceed as follows:
1. Check the rear lower right corner of the head for a
stamping that would indicate previous resurfacing (e.g.
.003).
2. To verify the information, or if no amount is indicated,
measure the head height (B).
3. If the head height is 94.75mm [3.730 inch] or greater, the
valve Seats may be reground if they have not been
reground previously.