PART NO. A-70227038. Gear, Camshaft Timing (Gas Eng. SN 45-48556- > ). Replaces 70203923 Dim A (1)54 Teeth. MODELS: Allis-Chalmers POWER UNIT: W201 (Gas) Allis-Chalmers POWER UNIT: W226 (Gas Eng. SN 45-48556- > ) Allis-Chalmers TRACTOR: D17 (Gas) Allis-Chalmers TRACTOR: WD45 (Gas Eng. SN 45-48556- > ) Allis-Chalmers TRACTOR: 170 (Gas) Allis-Chalmers TRACTOR: 175 (Gas) . Pk size: 1.