2.3.5. Engine timing z Camshaft, oil pump, air compressor, power steering pump, and fuel high pressure pump are driven by a gear train arranged at the inside of flywheel housing. High pressure pump driving gear (Z=33) Air compressor gear or PTO gear Idle gear (A gear Z=44) (B gear Z=28) High pressure pump idle gear (A gear Z=18) (B gear Z=18) Camshaft gear (Z=56) Crankshaft gear (Z=44) Oil pump gear (Z=33) Viewed from flywheel housing 2.3.6. Valves z The overhead valves are actuated via tungsten carbide tappets, push rods and rocker arms from the camshaft. DL06 Diesel Engine Technical Information 22