Posted by M Diesel on July 24, 2009 at 23:59:57 from (70.173.91.228):
In Reply to: F4 Magneto posted by Bob Mills on July 23, 2009 at 07:27:48:
Kinda hard to describe this without a picture, and pictures here are a miserable thing, so...
The impulse rotor is a split piece, having a front half and a rear half. Above the rear part is a locking pawl that falls down and stops it. The front part continues to turn, and has a ramp on it that comes around and lifts the pawl and releases the rear part, letting it snap forward. Very simple so far.
The pawl also has a little latch that holds it up when running. It's that weird looking little piece that the little spring in the back attaches to. A pair of flyweights behind the impulse keep the latch in place when at speed, disengaging the impulse.
If the pawl or rotor edges are rounded off, the pawl won't hold without some additional down pressure. On a good mag the engagement edges actually go beyond vertical, guaranteeing a positive lock.
If the pawl hinge is dirty it can't fall easily/completely and it may not be completely engage.
The latch may be sticking a bit. It kinda helps push down on the pawl a small amount.
The flyweights may be stuck, causing the latch to not release, but that would cause the pawl to not engage at all.
If the edges are NOT rounded off, it just needs a cleaning and lube.
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