70227038 Camshaft Timing Gear Fits Allis Chalmers 170 175 D17 WD45 W201One New Aftermarket Replacement Camshaft Timing Gear Fits Allis Chalmers Tractors This aftermarket replacement camshaft timing gear Fits Allis Chalmers (AC) gas engine tractors. The gear is a press on style component used in the engine valve timing system to synchronize camshaft rotation with the crankshaft. Note: WD45 and W226 fitment applies to gas engine serial number 45 48556 and up only. All other listed models require gas engines. Specifications