Aviator 2WD V8-4.6L DOHC (2003)
Piston Ring: Specifications
Piston ring end gap - compression (top) f ................................................................................................................... 0.150-0.300 mm (0.006-0.0018 inch)
Piston ring end gap - compression (bottom) f ........................................................................................................... 0.300-0.550 mm (0.0018-0.0022 inch)
Piston ring end gap - oil ring (steel rail) f ................................................................................................................. 0.15-0.66 mm (0.00591-0.02598 inch)
Piston ring groove width compression (top) ................................................................................................................ 1.230-1.250 mm (0.484-0.0492 inch)
Piston ring groove width compression (bottom) ................................................................................................... 1.520-1.540 mm (0.05984-0.06062 inch)
Piston ring groove width oil ring ............................................................................................................................... 3.030-3.055 mm (0.1193-0.1203 inch)
Piston ring width compression (top and max. bottom) .................................................................................................................... 1.00 mm (0.03937 inch)
Piston ring width - oil ring ...................................................................................................................................................... 1.15 mm (0.04528 inch) max.
Piston ring-to-groove clearance compression (top) ...................................................................................... 0.0090-0.0235 mm (0.000354-0.000925 inch)
Piston ring-to-groove clearance - compression (bottom) ..................................................................................... 0.030-0.080 mm (0.00118-0.00315 inch)
Piston ring-to-groove clearance oil ring ..................................................................................................................................................................... snug fit
f Specification in 90.200 mm diameter gauge.