K206954 New STD Piston for David Brown 1410 1412 1490 1690 1394 1494 1594 1694One New Aftermarket Replacement Standard Piston for David Brown (Fits Case Fits Case IH) Tractors This 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