RAM 4500 Chassis Cab Truck 2WD L6-6.7L DSL Turbo (2008)
Piston: Procedures
Head Gasket Selection
HEAD GASKET SELECTION
1. Measure piston protrusion for all six pistons.
2. Calculate the average piston protrusion. Maximum allowable protrusion is 0.516 mm (0.020 inch).
NOTE: There is only one head gasket available for the 6.7L engine.
Piston and Connecting Rod - Inspection
PISTONS
Inspect the pistons for damage and excessive wear. Check top of the piston, ring grooves, skirt and pin bore. Measure the piston skirt diameter. If the
piston is out of limits, replace the piston.
The upper groove only needs to be inspected for damage. Use a new piston ring (2) to measure the clearance in the intermediate ring groove. Minimum
clearance is 0.045 mm (0.0018 inch), maximum clearance is 0.095 mm (.0037 inch). If the clearance of the intermediate ring exceeds specifications,
replace the piston (3).
Use a new oil ring to measure the clearance in the oil groove. Minimum clearance is 0.040 mm (0.0016 inch), maximum clearance is 0.085 mm (.0033
inch). If the clearance exceeds specifications, replace the piston.
Measure the pin bore (2). The maximum diameter is 40.012 mm (1.5753 inch), Minimum is 40.006 mm (1.575 inch). If the bore is over limits, replace
the piston (1).
