Ford Workshop Service and Repair Manuals

Piston: Specifications

Piston 

Diameter

Coded red 1 .....................................................................................................................................................  90.177-90.197 mm (3.550-3.551 inch)
Coded blue 2 ...............................................................................................................................................  90.190-90.210 mm (3.5507-3.5515 inch)
Coded yellow 3 .............................................................................................................................................  90.203-90.223 mm (3.513-3.5521 inch)

Clearance-to-cylinder bore ..................................................................................................................................  0.012-0.0026 mm (0.0005-0.0001 inch)
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)

Pin

Bore diameter ..............................................................................................................................................  22.0015-22.004 mm (0.866-0.8663 inch)
Pin diameter ...............................................................................................................................................................................  22.0 mm (0.866 inch)
Length ........................................................................................................................................................................................  61.8 mm (2.433 inch)
Fit-to-piston .....................................................................................................................................................  0.005-0.010 mm (0.0002-0.0004 inch)