RAM 2500 Truck 2WD L6-359 5.9L DSL Turbo VIN D FI (1997)
Valve Seat: Service and Repair
Cleaning and Inspection
1. Cylinder head with integral valve seats can be ground only once. Previously ground integral seats must be replaced with service seats.
2. One X stamped into the head casting identify seats that have been ground previously.
3. Two X's stamped on the head indicate service seats have been installed. Service seats can be around.
4. On the integral seat head, if 0.254 mm (0.010 inch) or more has been removed from the head combustion surface, service seats must be installed.
5. To determine if the head has been previously resurfaced, before calculating valve depth, process as follows:
a. Check the rear lower right corner of the head for a stamping that would indicate previous resurfacing (0.003).
b. To verify the information, or if no amount is indicated, measure the head height.
c. If the head height is 94.75 mm (3.730 inch) or greater, the valve seats may be ground, if they have not been ground previously.
