HIGH EGT & WON'T SHUT DOWN

by Bob Turner in General Tech Discussion 12 years ago

Page 2 of 3

Start
Prev
1
2
3
Next
End

Re: HIGH EGT & WON'T SHUT DOWN

by Roger Lee » 12 years ago

Roger Lee

125 5.12k 4.53k

Hi Bob,

Reduce the idle to 1700 and let it cool for 1-2 min. Turn one mag off for 3-4 seconds and then the next. Before shutdown. The EGT's should be lower once you move the EGT'S probes.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Report
Re: HIGH EGT & WON'T SHUT DOWN

by MARK JACKSON » 12 years ago

MARK JACKSON

12 332 11

Hi Bob

Obviously Roger is right in what he says, but when you switch the mags off it should stop, no questions. If it was idling high then you may get a bit of kickback, but that's it.

I would also look at the module wires on this one as well. The older engines with the 4pin plugs had problems with the wires breaking down inside the PVC sheath, so the wire looked ok but you could get an intermittent connection. One of the main problems with the broken wire was sometimes when you switched the mags off, the engine kept running. If this is intermittent on one mag, it will cough and splutter as the vibration makes and then breaks the earthing connection.

I would suggest you pull all the wires on the modules. If the core is broken, the wire will stretch.

Good luck. Mark

IMG_1372.JPG (You do not have access to download this file.)

Report
Re: HIGH EGT & WON'T SHUT DOWN

by Roger Lee » 12 years ago

Roger Lee

125 5.12k 4.53k

Mark is absolutely correct. Anytime you are checking wires then it should be from beginning to the end. Wires may have something laying on them and vibration wears through the insulation, wires break and hang on by a thread making a poor connection where the wire is crimped into the electrical connector and connections get corroded it its contact point and may still have a connection, but a poor one. Screws loosen, connectors work themselves apart, ect... So when looking at a wire look at all of it from beginning to end.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Thank you said by: Jan Nademlejnsky

Report
Re: HIGH EGT & WON'T SHUT DOWN

by Bob Turner » 12 years ago

Bob Turner

2 11 0

Mark/Roger; Thanks for the input (Mark I appreciate the photo as well, that helps). The next time I get to the airport I'll check the wires closer and see if any may have a break internally. In addition I'll reduce the idle RPM and follow the recommended shutdown and we'll see what happens.

It is an older module and I can see the possibility of a break internally in the wires.

Thanks guys, I'll give you some feedback soon.

Report
Re: HIGH EGT & WON'T SHUT DOWN

by Bob Turner » 12 years ago

Bob Turner

2 11 0

Mark/Roger; Sorry it has taken so long to get back. Mark, I did check all of the wiring and it was good. The wire to the ignition modules was not shielded, but I'm not getting any static so I'll change it in the future.

Roger, I finally got the EGT probes relocated and the old holes welded (I even found a small crack in the muffler and got it fixed at the same time).

At 5490 RPM I'm getting EGTs of 1527 and 1518 so the relocation of the probes had a definite impact, though not as much as I had hoped.

I have reduced the idle RPM so I can pull it down to 1600 just prior to shutdown. That seems to work well with no kicking back over (I do cool it first as recommended, shut down one mag and then pull it to idle (about 1600) and it shuts right down.

Things appear to be running smoothly at the moment and I really appreciate the input.

Report

Page 2 of 3

Start
Prev
1
2
3
Next
End

You do not have permissions to reply to this topic.

Title	Category	Replies
shutdown sequence - master switch	912 / 914 Technical Questions	2
912 iS Sport EGT Differences and Coil Problem?	912iS Technical Questions	3
912 UL EGT	912 / 914 Technical Questions	3
Performance at high attitudes	915iS Technical Questions	6
912is egt offset	912iS Technical Questions	1

HIGH EGT & WON'T SHUT DOWN

Recent Videos

Safety First!

ROTALK News

Prize Giveaway!

Log In/Out

Login