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Changing HT leads on Rotax UL914

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Alan Carter

Joined: 02 Jul 2012
Posts: 378
Location: Kent, England.

Posted: Wed Jul 04, 2012 2:48 pm Post subject: Changing HT leads on Rotax UL914

Hello ALL.

I think i should have stuck to Flight Simulators, Having just purchased G-PEGY Mag drop on left mag, top row sparking plugs ,

Have 2 new caps, so tried 2 a side in turn, No Change in mag drop.

Started engine , run on left mag only, with Front top right lead off, engine sounded the same so think its this one is the problem.

All the bloody top plug leads go to the bottom side of the mag, ie (the electronic unit), So you can,t get to them to un screw the leads.

The complete unit is mounted on rubber cotton real, 3 of them, one at the back and two at the front.

You can-not get a spanner on them, i have tried all ways, purchased cranked spanners and ground it down to slip over nut , no good.

Finally i have managed to release the rear back mag mount and the inboard front cotton reals mount.

The outboard front rubber cotton real  mount ,again no spanner will go in,

This rubber mounting fits over a cast stud which is part of the inlet housing.

Now i don,t know if the cotton real is just pushed over this stud pin, and has over the years corroded alloy and steel together, so NOW it won,t pull off.

Or if it is held with this inside bolt which i cannot get to.

Will put some grips on the real and give it a wriggle see if it moves.

Once this is released i can do the 59 second job of screwing the new leads on.

Just hope i can release it tomorrow .

Has any body done this job before, Help

Regards

Alan

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rehn(at)rockisland.com
Guest

Posted: Thu Jul 05, 2012 11:15 am Post subject: Changing HT leads on Rotax UL914

Alan

I had a similar problem and went thru the trouble shooting as you did hoping it was a plug or wire. I narrowed it down to the electronic module itself. I sent the module to a Rotax service center and they tested it. The module was only firing two of the top 4 plugs. Bought a new module and all was well. $1,000 dollar fix, ouch!

Jerry



Sent from my iPad



On Jul 4, 2012, at 3:48 PM, "Alan Carter" <alancarteresq(at)onetel.net> wrote:



 	  Quote: 	
		   

 

 Hello ALL.

 I think i should have stuck to Flight Simulators, Having just purchased G-PEGY Mag drop on left mag, top row sparking plugs ,

 Have 2 new caps, so tried 2 a side in turn, No Change in mag drop.

 Started engine , run on left mag only, with Front top right lead off, engine sounded the same so think its this one is the problem.

 All the bloody top plug leads go to the bottom side of the mag, ie (the electronic unit), So you can,t get to them to un screw the leads.

 The complete unit is mounted on rubber cotton real, 3 of them, one at the back and two at the front.

 You can-not get a spanner on them, i have tried all ways, purchased cranked spanners and ground it down to slip over nut , no good.

 Finally i have managed to release the rear back mag mount and the inboard front cotton reals mount.

 The outboard front rubber cotton real  mount ,again no spanner will go in,

 This rubber mounting fits over a cast stud which is part of the inlet housing.

 Now i don,t know if the cotton real is just pushed over this stud pin, and has over the years corroded alloy and steel together, so NOW it won,t pull off.

 Or if it is held with this inside bolt which i cannot get to.

 Will put some grips on the real and give it a wriggle see if it moves.

 Once this is released i can do the 59 second job of screwing the new leads on.

 Just hope i can release it tomorrow .

 Has any body done this job before, Help

 Regards

 Alan

 

 

 

 

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 http://forums.matronics.com/viewtopic.php?p=377292#377292

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Alan Carter

Joined: 02 Jul 2012
Posts: 378
Location: Kent, England.

Posted: Thu Jul 05, 2012 12:13 pm Post subject: Re: Changing HT leads on Rotax UL914

Hello Jerry.

i am not having much luck,i downloaded a diagram and found you have to remove part of the carburettor  inlet manifold to gain access in  replace the left mags Ht Leads. To change HT Leads should be a 15 minute job  this has taken me well over 5 hrs , I have heard Ratax engines are good, im not impressed so far, as far as this components is designed its rubbish.

I can,t believe just how long a job it been. The unit should be made removable by un doing say 4 bolts and lifting out to gain access,or even no removal at all job done in situ. 

Anyway i now have rough running on both mags,

I will have another go at it tomorrow,

Alan

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Alan Carter

Joined: 02 Jul 2012
Posts: 378
Location: Kent, England.

Posted: Mon Jul 16, 2012 4:47 pm Post subject: Re: Changing HT leads on Rotax UL914

Hello.

This is just an ending to this thread.

I finally found the problem was a Mag Coil,firing the bottom front cylinders.

So replaced with a new Coil costing £275 all in. 

This time i managed to fit it without removing the inlet manifold as per Rotax manual, but to get at the nuts and bolts was very difficult,but i managed it, but probably saved no time.

To replace a Mag or a lower HT lead is simple job but a Pigs Ear of a job to get at.

Anyway all is well and its running as sweet as a nut.

First Flight was on Sunday, and it flew beautifully , as an X Instructor and my first experience with a Europa i would say or my opinion is 2x as difficult as a Cessna 150 in skill. You may think differently.

But on the last landing i had a Bird Strike , a Crow hit during flare and hold off, it hit the leading edge of the right tailplane, i think ?

Bird intact, No blood, a few feathers missing,The Aircraft is new to me , but i think a small 3mm chip made by the beak of the bird may have been made, you have to look for it, but i know its there, That really rounded off my day.

All the best.

Alan

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