JimboSoCal78
Filing Flight Plan
Hey guys/gals,
I went out to my plane yesterday to get it ready for a long cross country later this week. Oil change, check tires, overall inspection under the cowling etc.
While running the engine to get it warm to change the oil and I noticed a problem.
When selecting the L mag switch at low power the engine wants to die then eventually does die. (Slick 6314 Magneto)
Cylinders 1,3,5 egt are also much cooler according to my JPI.
However at runup check list mag check speed power @ 1700 RPM there is no issue.
Mag check is normal, EGT’s are uniform across all 6 cylinders, drop is under 75 rpm and different from right mag is ~40-50rpm.
These magnetos have about 400 hours on them. Other than the low RPM issue, the engine runs perfectly in all other types of operation.
ILL ALSO ADD THAT I REMOVED THE P-lead FROM THE LEFT MAG AND HAD NO ISSUE WITH THE KEY IN THE OFF POSITION AND ENGINE RUNNING (running on the left mag only.)
My ignition switch ACS with turn to start is old has about 1500 hours on it, could that be the issue? Bad/Worn contacts grounding out the Left mag at low rpm?
I’m pretty stumped on this one and my I/A is out of town at the moment so no help there.
According to my poh everything thing is normal for the run up.
Am I just being a sissy by being concerned about the low RPM drop?
Thanks in advance for all your help/ideas
Jim
I went out to my plane yesterday to get it ready for a long cross country later this week. Oil change, check tires, overall inspection under the cowling etc.
While running the engine to get it warm to change the oil and I noticed a problem.
When selecting the L mag switch at low power the engine wants to die then eventually does die. (Slick 6314 Magneto)
Cylinders 1,3,5 egt are also much cooler according to my JPI.
However at runup check list mag check speed power @ 1700 RPM there is no issue.
Mag check is normal, EGT’s are uniform across all 6 cylinders, drop is under 75 rpm and different from right mag is ~40-50rpm.
These magnetos have about 400 hours on them. Other than the low RPM issue, the engine runs perfectly in all other types of operation.
ILL ALSO ADD THAT I REMOVED THE P-lead FROM THE LEFT MAG AND HAD NO ISSUE WITH THE KEY IN THE OFF POSITION AND ENGINE RUNNING (running on the left mag only.)
My ignition switch ACS with turn to start is old has about 1500 hours on it, could that be the issue? Bad/Worn contacts grounding out the Left mag at low rpm?
I’m pretty stumped on this one and my I/A is out of town at the moment so no help there.
According to my poh everything thing is normal for the run up.
Am I just being a sissy by being concerned about the low RPM drop?
Thanks in advance for all your help/ideas
Jim
Last edited: