mag check
in General Tech Discussion
12 years ago
my engine dies when i go to the left mag on the mag check. Any ideas. thanks
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by Rob Seaton » 12 years ago
Ken,
It will be the switch/P-lead (grounding wire)or the module. Divide and conquer:
1-Try removing the P-leads at the module and connect test leads (alligator clips work with old ignition systems) then ground the modules with the test leads. You need to be running the engine and you need someone competent to hold the test leads and touch them to ground (the engine block) one at a time and then both (to kill the engine). Don't touch the wire with your finger, you will get shocked. Warning: Get a pro (A&P, iRMT) to do this for you and tie down the aircraft.
2- if the engine has a normal mag drop with this test then the module is OK and the P-lead or switch is at fault. If it still dies the module is bad.
If you have a rotary switch it could be arcing inside. The P-lead may be touching a ground somehow.
I hope I have thought of everything but again, use caution and common sense when testing on a running engine.
Rob
Thank you said by: Ken Marshall
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by Przemysław Wiśniewski » 12 years ago
Hi. I made test on my 912. 4000RPM, Left magneto drops to 3800-3750 rpm, right magneto drops to ~3600rpm.
When I pull half way choke rpm was increased up to 4200rpm and again, Left drop's to ~3900, right drops to ~3800rpm.
It's mean I have ignition or carburetors problem?
Thank you said by: Ken Marshall
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by Ken Marshall » 12 years ago
Thanks for the help. it turned out to be an entermitent mag switch
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