One New Aftermarket Replacement Standard Piston for David Brown (Fits Case/Fits Case IH) TractorsThis standard-size replacement piston fits the David Brown AD4/55, AD4/55T, and AD6/55 diesel engines used across the David Brown and Fits Case/Fits Case IH 10, 90, and 94 Series tractors. It features a dish-top (F5) combustion chamber crown with an aluminum fin (Al Fin) ring groove for the oil control ring, and accepts four piston rings. Designed as a direct drop-in replacement at standard bore size.Specifications Size: Standard (STD) Bore Diameter: 100.00 mm (3.94 in) Piston Length: 4.16 in (105.58 mm) Compression Height: 2.38 in (60.35 mm) Bowl Depth: 20.35 mm Chamber Diameter: 2.32 in (58.87 mm) Pin Diameter: 31.75 mm (1.25 in) Number of Rings: 4 Crown Type: Dish Top Chamber Type: F5 Ring Type: Al Fin Ring Compatible ModelsDavid Brown / Fits Case / Fits Case IH: 1390, 1394, 1410, 1412, 1490, 1494, 1594, 1690, 1690 Turbo, 1694Replaces Part Number(s):K206954, K206954-A, K944573, PA771, PA772, 57507, B512657New aftermarket replacement part - not remanufactured, not used.
