MacDonald, Alexander Forsyth, 1897-1965 · Port Credit, Ont. : Aviation Service Corporation · leaf 127
he proper clear-ance is found with the aid of feelers. The clearancesspecified by the engine manufacturer must be rigidlyobserved. 4. Tighten the lock screw, taking care not to turnthe adjusting screw when doing so. The Valve, or Tappet Clearances on an aero enginemust be adjusted frequently, at… … CRANKSHAFT GEARCAMSHAFTGEAR CAM CAM Fig. 2S. Valve Mechanism. IGNITION TIMING As has been noted above, the spark on modern highspeed engines also occurs early to allow completecombustion and maximum pressure to be developedwhen the piston passes Top Dead Centre and is travel-ling down. IGNITION…
Airplanes
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