What is the purpose of magneto timing pin?
One set of timing marks is on the front side of the starter ring gear. Line these marks up with the 1/16-inch hole in the starter housing (see arrow). As an option a small pin can be inserted in the hole to make it easier to line up with the marks.
What is magneto timing drift?
When magneto timing drift exceeds 5 degrees, the magneto output may be diminished and ignition of the fuel-air mixture becomes less effective. Symptoms of this condition can include: hard starting, a rough running engine, and RPM/differential RPM drops exceeding the engine manufacturers’ allowable preflight mag checks.
Why do you internally time a magneto after testing?
The internal timing of the magneto, including breaker point adjustment, which must be correct to obtain maximum potential voltage from the magneto. With the engine still in the firing position, the magnetos should be timed by moving them in the flange slots until the breaker points in the magneto just open.
What is E gap in a magneto?
E-Gap Angle. The position of the rotating magnet in a magneto when the breaker points are timed to open. The E-gap (efficiency gap) angle is several degrees of magnet rotation beyond the magnet’s neutral position.
What is checked when a magneto is internally timed?
What is checked when a magneto is internally timed? Internally timing a magneto consists of adjusting the breaker points so they will open at the instant the rotating magnet is in its E-gap position and the distributor rotor is in the position to direct the high voltage to cylinder number one.
What is high tension magneto timing?
The internal timing of the magneto, including breaker point adjustment, which must be correct to obtain maximum potential voltage from the magneto. The engine crankshaft position where the spark occurs. The engine is usually timed by using the No.
What is magneto lag?
The Magneto Ignition System The rotational distance between stop pin engagement and drive lug engagement determines how far the engine turns until the magneto snaps. This is called “lag angle”.
What is magneto timing?
Recall that the act of firing the spark plugs by the magnetos is when the magneto points open, causing a collapse of the magnetic field in the magneto primary coil. The magneto timing box is simply a circuit tester with lights and a tone. Move the propeller slowly in the direction of normal engine operation.
What must be checked when internally timing a magneto?
When replacing magnetos on aircraft engines, two factors must be considered: The internal timing of the magneto, including breaker point adjustment, which must be correct to obtain maximum potential voltage from the magneto. The engine crankshaft position where the spark occurs.
What should the point gap be on a slick Magneto?
.008 to .010 inch for Slick 4300/6300 series magnetos. But Wait! You do not set point gap. You set E-gap. On the Slick magneto, E-gap is critical; not point gap – much easier starting! One establishes E-gap (point opening at defined rotor position) and then point gap should be within the limit range.
Where is the Slick E gap timing tool?
Slick E gap timing tool (red arrow) inserted into slot in rotor and against poll shoes. Notice how magneto is oriented with the coil up.
How is the timing of a magneto set?
Magneto Timing. • Usually the first thing to be set is the distributor/rotor alignment. • Depending on the magneto, the distributor will be indexed to the rotor shaft during initial assembly of the magneto upper and lower housing.
What’s the point gap on a slick rotor?
Shown here is the E-150 E Gap Tool being used to set rotor position. Then use your timing light to detect point opening. By point gap we mean the maximum distance the contact points separate. Reference the Slick Maintenance manual for complete instructions on setting internal magneto timing.