Inspection And Repair Of A Radial Engine Flashcards
In what position should the crankshaft be when a magneto is being timed to the engine?
The piston in cylinder no. 1 should be in the correct position for ignition to occur. This is normally about 30 degree before top center on compression strokes
What is the purpose of a cold cylinder check?
A cold cylinder check determines which cylinder is not firing.
What is checked on engine runup to determine the operational condition of the engine?
Everything
How can you determine the firing order of an 18-cylinder radial engine?
Begin with cylinder 1 add 11 and subtract 7, whichever will be keep the numbers between 1 and 8
What are two main causes of a cylinder having low compression?
Piston rings not seating or broken, and valves not seating or burned
What is a hydraulic lock in an aircraft engine?
Oil has drained past the piston rings and filled the combustion chamber of cylinders that are below the center line of the engine.
How is a hydraulic lock removed from an aircraft engine?
Remove a spark plug from the locked cylinder and drain all of the oil out.
What is a low-tension ignition system?
It is an ignition system using a magneto with a brush-type distributor and a coil that has no secondary wiring
What is a floating cam ring on a large radial engine?
It is a cam ring that rides on a shelf-type bearing with a large amount of clearance between the bearing and the ring.
Why is valve clearance adjusted on radial engines, but not on most horizontally opposed engines?
Most horizontally opposed engines have hydraulic valve lifters that keep all of the clearance out of the valve train. Radial engines have solid lifters
Why are both the hot and cold valve clearances given for most radial engines?
The hot clearance is given for valve timing purposes. The timing is adjusted with the valve in cylinder number one, set with the hot clearance. When the timing is set all of the valves are adjusted to their cold clearance
