Magneto on strike!

[rdv]

The flight before last went great. Run-up was smooth and mag check was normal. Now, the last flight, left mag is dead. The engine was hard to start. Hopefully this is a case of easy go, easy come. Maybe ignition switch? 

Ryan

[N201MKTurbo]

It can be a lot of things, you need to do some more troubleshooting. I once had a condenser wire that was resting against the inside case and eventually wore through the the insulation and shorted out the mag. cost about $0.25 worth of parts to repair.

[jlunseth]

And I had two new magnetos put in at annual, they did the same thing two weeks later, and one had died.  Cost about 1 AMU's to install the replacement (fortunately covered by warranty).

[markejackson02]

Quote: rdv

The flight before last went great. Run-up was smooth and mag check was normal. Now, the last flight, left mag is dead. The engine was hard to start. Hopefully this is a case of easy go, easy come. Maybe ignition switch? 

Ryan

[rob]

Did you get a resolution here? I lost my left mag on takeoff this weekend (out of town). I'm expecting that the Mag is shot considering it's age, but the points test ok as does the switch. They'll do more troubleshooting tomorrow, but can anyone tell me what I'm going to be looking at in terms of costs for a mag on a 65C (with the shower of sparks ignition)?

 

[rdv]

Hey Rob,

No resolution yet. Mags (both) are in shop as I write this. I just asked the guys to bench test and fix whats wrong if possible because my motor is high-time (1700 something hours). I'll get back to this thread when I see the numbers. I understand that a complete overhaul runs about $500cdn per mag.

 

 

[rdv]

Rob,

The failure turned out to be a bad coil in the left mag. I had both overhauled and its going to cost around $900 cdn. Ouch! Oh well, I guess this is what I signed up for with an old airplane.

 

Ryan

[rob]

Looks like we're on the same page. We now think that mine is also a bad coil. It's a semi-intermittent problem, that seems to occur when the mag gets warm. Run-ups before takeoff are great. Takeoff power though, quickly causes a problem.

[MooneyMitch]

Quote: rdv

Rob,

The failure turned out to be a bad coil in the left mag. I had both overhauled and its going to cost around $900 cdn. Ouch! Oh well, I guess this is what I signed up for with an old airplane.

 

Ryan

[rob]

I have no idea how you managed an overhaul on both mags for only 900CDN. I had both of mine repaired as the 500 hour inspection found some problems on both of them. I'm spending closer to 1600US for the repairs, which include a bad coil and two bad blocks, among other things.