RAM 3500 Truck 4WD L6-5.9L DSL Turbo VIN 6 (1998)
Valve Depth
After resurfacing the valves and determining that all valves meet specifications, install the valves in their designated locations and measure valve depth.
The valve depth is the distance from the valve face to the head deck. Record the depth of each valve.
Grind the valve seats to remove scores, scratches and burns. The seat angle should be-Intake 30° and Exhaust 45°.
Install the valves in their respective bores and measure the depth again. Record the depth of each valve.
The grinding depth is the difference between the measurement before grinding and the measurement after grinding. The grinding depth maximum limit
(integral seats only) is 0.254 mm (0.010 inch). Service valve seats are available for over limit integral valve seats.
Identify ground valve seats by stamping the cylinder head.
Install the valves in their designated locations and measure the depth of each. The valve depth limit (Integral and Inserted Seats) is 0.99 mm to 1.52 mm
(0.039 inch to 0.060 inch). Replace the valve if the depth is over this limit.
Apply a light coat of valve lapping compound to each valve and lap each valve to its mating seat.
Remove the valves and clean lapping compound from the valves and seats.
Measure the valve seat width indicated by the lapping surface. The valve seat width limit is 1.50-2.00 mm (0.060-0.080 inch).
Grind Valve Seat
If required, grind the areas with a 60° stone and a 15° stone to center the seat on the valve face. Maintain the valve seat width limits.
