3.3. Engine timing Camshaft, oil pump and injection pump are driven by a gear train arranged at the front end. Injection pump gear (Z = 72) Water pump gear (Z = 29) Camshaft gear (Z = 72) Idle gear (Z = 52) Crankshaft gear (Z = 36) Oil pump idle gear (Z = 31) Oil pump drive gear (Z = 32) EA8O3002 3.4. Valves The overhead valves are actuated via chilled cast iron tappets, push rods and rocker arms from the camshaft. - 12 -