Ford Workshop Service and Repair Manuals

Piston Ring: Specifications

Piston Rings 

Ring end gap

Compression (top and bottom) ................................................................................................................................  0.23-0.49 mm (0.010-0.020 inch)
Oil ring (steel rail) ...................................................................................................................................................  0.05-0.66 mm (0.006-0.026 inch)

Ring groove width

Compression (top) ...............................................................................................................................................  1.520-1.550 mm (0.002-0.610 inch)
Compression (bottom) ........................................................................................................................................  1.520-1.530 mm(0.060-0.0602 inch)
Oil ring ..............................................................................................................................................................  6.996-7.224 mm (0.275-0.2844 inch)

Ring width

Compression ........................................................................................................................................................  1.49-1.47 mm (0.0587-0.0579 inch)
Oil ring rail (2) ......................................................................................  0.473-0.447 mm (0.0186-0.0176 inch), 0.483 mm (0.0190 inch) max. at ID
Oil ring expander ................................................................................................................................................  2.038-1.960 mm (0.080-0.077 inch)

Ring-to-groove clearance

Compression ....................................................................................................................................................  0.030-0.070 mm (0.0012-0.0028 inch)
Oil ring assembly ............................................................................................................................................  0.046-0.196 mm (0.0018-0.0077 inch)