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glipaz
Joined: 11 Jan 2011
Posts: 110
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 Posted: Fri Jul 07, 2017 5:00 pm Post subject: Magneto failure CD-5 |
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Conundrum:
At runup, Mag 2 failed (engine turned off). Engine ran smoothly on Mag 1. Returned to chocks and opened Mag 2 to discover a broken points spring. Obvious hard break. Replaced points and opened Mag 1 to inspect. Discovered that the rotor on Mag 1 was completely loose (all three bolts were loose). Tightened rotor on Mag 1, closed both mags and fired it up. Started easily. Mag 2 now worked fine but now Mag 1 failed. What?!
Thought it might be a switch problem. Tested Mag switch to make sure it was not a wiring short to ground and it checked ok. Back to the Mag.
Inspected rotor and cap. Ok. Checked points. Open fine. Replaced cigarette. Still wouldn't fire. Replaced coil. Still wouldn't fire. Finally replaced Mag. Motor fired and tested fine on both mags. Runup Mag check normal.
Note: we turned the bad Mag 1 by hand and could not get a spark out of the cigarette and the Mag turned fairly freely, without the normal flopping that the magnets provide.
The mystery is this: assuming Mag 1 was fine and Mag 2 had a hard break prior to shutdown (prior Mag checks on Mag 1 were fine) how did it fail after tightening down the rotor? Why is it now producing no spark and seems to have lost its magnetism? Prior to this both Mags worked fine on previous runups and flights.
Gil Lipaz
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Lancer
Joined: 21 Apr 2016
Posts: 30
Location: Cairns, Australia
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| Posted: Fri Jul 14, 2017 11:18 am Post subject: Re: Magneto failure CD-5 |
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The rotor needs to be timed to the shaft which is why the 3 screws are in slots. Did you time the rotor??
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dsavarese0812(at)bellsout
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| Posted: Fri Jul 14, 2017 1:56 pm Post subject: Magneto failure CD-5 |
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"Time" the rotor? How do you "time" the rotor? Or do you mean the
rotor needs to be properly ALIGNED? The slots in the rotor screw holes
are used to _position_ the finger (rotor turns counter clockwise and on
2 finger rotors, it's the leading finger in the counter clockwise
direction) of the rotor to point _directly_ at the scribe mark on the
cover's mating surface next to the high voltage stick at the exact point
where the points open, using a magneto timing box.
If anyone would like the diagram of the magneto under the cover, marked
to point out the various parts used in setting the points and the fine
timing adjustment, email me off-list and I will send it to you.
Dennis
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 7/14/2017 3:18 PM, Lancer wrote:
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