RAM 3500 Truck 4WD L6-5.9L DSL Turbo VIN 6 (1998)
Valve Seat: Service and Repair
Grinding
Service Valve Seat Grinding
Install the valves in their designated location and measure the valve depth. The valve depth is the distance from the valve face to the head deck.
Valve Depth With Seat Insert
Record the depth of each valve. The depth is 0.99-1.52 mm (0.039-0.060 inch).
Grind the valve seats to remove scores, scratches and burns. The valve seat angle is 30° (Intake) and 45° (Exhaust).
Install the valves in their respective bores and measure the depth again. The valve depth limit is 0.99-1.52 mm (0.039-0.060 inch). Replace the valve if
the depth is over the limit.
Apply a light coat of valve lapping compound to each valve and lap each valve to its companion seat. Remove the valves and clean the lapping
compound from the valve and seats.
Valve Seat Width
Measure the valve seat width indicated by the lapped surface. The width limits are 1.5-2.0 mm (0.060-0.080 inch). If required, grind lower area with 60°
stone and upper area with 15° stone. Be sure to center the seat on the valve face. Maintain the valve seat within limits.
Integral Seat Grinding