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kirk(at)mninter.net
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 Posted: Tue Jan 10, 2006 8:12 pm Post subject: Rotax 912 |
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Thanks to everyone that posted ideas for my Rotax 912 UL ignition problem.
As to the heart of the matter:
I have had a slight rough sound in the engine for about two years. I didn't not think much of it because I didn't have anything go wrong until last winter. The carbs started to leak fuel from the vent line. I sent the carbs to Lockwood, they checked out fine. I changed motor mounts, balanced the prop, and installed new carb mounts. I checked resistance with an ohmmeter on the ignition coils and found three were out of spec. I bought three new coils from Lockwood and changed all the plug wires. I changed all the sparkplugs as well. Still had the slight rough sound in both sides of the ignition, and the "B" side ignition had a slightly lower drop than the A.
I pneumatically synchronized the carbs three times getting Them exactly even. Still had the problem. I took off the gearbox and had Lockwood change out the springs. Slight roughness still there. I did that about two months ago.
About three weeks ago, I tried to fly the plane and the engine was more rough than usual. I did an ignition check at 3850 rpm. The B side dropped about 325 rpm.
I swapped the red leads from the stator, and the rough drop stayed with the B side. I swapped the four pole connectors from the modules to the stator and the rough drop stayed with the B side.
I asked Lockwood about the stator and they replied that it could not be the stator because that would be a total failure like the modules.
I called Lockwood again and they told me it had to be the spark plugs the plug boots or the connection to the coils. The plugs are only a year old with about 60 hours on them.
I checked all the boots with an ohmmeter and they were all in spec except one. The one was about 6.02K ohm. The book says 4.4 to 6 K ohm. So, this may be the cause I don't know yet.
As I stated before, I changed out three coils because they were out of spec. I thought maybe I should buy the fourth coil, but the rough drop in rpm is on the B side ignition, and the old coil is on the A side ignition. Keep in mind that there is a slight roughness in BOTH A and B side ignitions. It's just that the more rough, and 325 drop in rpm, is on the B side, and I cannot fly the plane.
Thanks again to everyone that posted a response. I will keep up the fight. The answers got to be there somewhere.
Kirk Martenson
Classic IV 912 UL
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morid(at)northland.lib.mi
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| Posted: Wed Jan 11, 2006 4:17 am Post subject: Rotax 912 |
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Kirk, did you try a complete new set of plugs?
Deke
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