Engine won't run on the Left Magneto

[Adverseyaw0317]

3 hours ago, N201MKTurbo said:

Just to get this straight, You have sent the mag out for inspection since this dead mag problem happened? If so ask the shop that inspected it if they ran it on a spark gap tester.

Indeed it has been inspected since the issue began. What started as a large mag drop before inspection became it would not run on the left mag after inspection. 

[OR75]

I suppose the mag was reinstalled by a local A&P after being overhauled. Any A&P with some experience (with basic timing tools) would know how to troubleshoot the issue: spark plugs, harness, magneto, ignition switch.

 

[Adverseyaw0317]

24 minutes ago, OR75 said:

I suppose the mag was reinstalled by a local A&P after being overhauled. Any A&P with some experience (with basic timing tools) would know how to troubleshoot the issue: spark plugs, harness, magneto, ignition switch.

 

I will certainly let the shop know that

[skykrawler]

@mathiasarnold One of the causes for the rubbing block on the points to fail is the bearing at the base of the magneto is overheating (failing).  This heat travels up the shaft and melts the rubbing blocks.

 

On 10/30/2023 at 9:42 AM, MatthiasArnold said:

I had a similar situation with one of my (not dual) magnetos:

App. 90hours after overhaul the magneto failed.
The root case was a completely worn "cam follower" of the contact assembly which was replaced by new.
I personally attended the follow up overhaul in the renowned repair shop (in Germany), where the magneto was completely disassembled, cleaned, capacitors replaced (although the passed the tests) and yet another new contact assembly utilized during assembly. The test run on the Magentor tester looked perfect.
After reinstalling the magnet on the A/C the freshly (double) overhauled magneto started performing a little bit strange again (no real rpm drop during mag check although the p-leads & ignitions switch are ok) after only 40h.
Talking to my AP and IA we choose another renowned repair shop (in Belgium this time) and I once again personally attended the overhaul number #3..
Once again the (Nylon) "cam follower" of the contact assembly was pretty much worn (thus the points were close to not opening again).
We checked every part and detected some very light corrosion on the magneto's cam shaft. After replacing the cam shaft with new and of course yet another new contact assembly the magneto finally seems to work as expected..

Long story short: many reasons for a magneto to fail - this is just one of them..
 

 

[Adverseyaw0317]

BLUF: airborne again finally 
 

Well I have one MTF down with no anomalys. Once I get another I will post the back story. I would like to not muddy the name of a company until I’m sure they had poor quality. 

 

[Adverseyaw0317]

As it turns out, I was just unlucky and got a bad batch of fine wire spark plugs. I suppose I should have questioned 0 FH plugs sooner. I just assumed that there was no way all 8 could have been bad. Switched to the other brand and everything is running well. On the plus side, I have a brand new ignition system now HAHA.


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