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john.marzulli(at)gmail.co
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 Posted: Sun Dec 30, 2012 10:19 am Post subject: Need Rotax 912S Help To Get The 7-Oh-Fun Back Home |
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I need some Rotax advise as my plane is stranded at another airport.
The coolant overflow bottle failed in flight. The first sign was some red fluid in the cockpit a few minutes after take off. At first I thought it was brake fluid.
I noted the EGTs were high, but the CHTs were in range, and the oil temps were slightly high, but not in "the red zone"
A minute later I started smelling something in the cockpit and turned back to the field at reduced power.
A few minutes later I lost one of the CHT probes, but the other was reading fine. A few minutes after that I lost the other CHT probe. Oil temps at this point were still just into the yellow zone.
On the ground I pulled the cowling and found the coolant bottle had melted a hole at the point closest to the oil reservoir. The shrink wrap that holds the CHTS in place had melted and the CHT connectors had come out of position.
I was able to get some more DexCool and field replaced the coolant bottle with some attempts to heat shield it.
Runup and pre-flight were normal. The engine made normal power on take off. After climbing above the airport I noticed the CHTs were still high.
The engine was also only making 5100RPM in level flight with full throttle. I normally can exceed 5500 with my prop pitch.
I landed back and found a hangar to tuck it back in at.
So now the question is, what should I be looking for? The engine ran smooth. Shut down was brisk as always. Based on this I do not think one of the pistons is damaged.
The current plan is to compression test it, check the plugs and pull the oil filter to look for metal.
Does anyone else have any ideas?
John Marzulli
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
[quote][b]
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ninjaneer451(at)gmail.com
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| Posted: Sun Dec 30, 2012 11:03 am Post subject: Need Rotax 912S Help To Get The 7-Oh-Fun Back Home |
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Hi John,
Sorry to hear about your troubles. I do not have any Rotax experience yet, but have had an engine lose compression after overheating. Twice. So your plan of attack seems reasonable. Since I am in Marysville, contact me if you could use an extra hand for anything. If you want to move the plane by ground, my pickup is available as well.
Best of luck,
Ken
On Sun, Dec 30, 2012 at 10:18 AM, John Marzulli <john.marzulli(at)gmail.com (john.marzulli(at)gmail.com)> wrote:
[quote]
I need some Rotax advise as my plane is stranded at another airport.
The coolant overflow bottle failed in flight. The first sign was some red fluid in the cockpit a few minutes after take off. At first I thought it was brake fluid.
I noted the EGTs were high, but the CHTs were in range, and the oil temps were slightly high, but not in "the red zone"
A minute later I started smelling something in the cockpit and turned back to the field at reduced power.
A few minutes later I lost one of the CHT probes, but the other was reading fine. A few minutes after that I lost the other CHT probe. Oil temps at this point were still just into the yellow zone.
On the ground I pulled the cowling and found the coolant bottle had melted a hole at the point closest to the oil reservoir. The shrink wrap that holds the CHTS in place had melted and the CHT connectors had come out of position.
I was able to get some more DexCool and field replaced the coolant bottle with some attempts to heat shield it.
Runup and pre-flight were normal. The engine made normal power on take off. After climbing above the airport I noticed the CHTs were still high.
The engine was also only making 5100RPM in level flight with full throttle. I normally can exceed 5500 with my prop pitch.
I landed back and found a hangar to tuck it back in at.
So now the question is, what should I be looking for? The engine ran smooth. Shut down was brisk as always. Based on this I do not think one of the pistons is damaged.
The current plan is to compression test it, check the plugs and pull the oil filter to look for metal.
Does anyone else have any ideas?
John Marzulli
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
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tclongo(at)att.net
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| Posted: Sun Dec 30, 2012 1:19 pm Post subject: Need Rotax 912S Help To Get The 7-Oh-Fun Back Home |
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Hi John, I would do a compression leak down test make sure all your cylinders are up to par. More than likely when you filled with coolant after you lost it the first time, you had an air pocket somewhere. This happened on my first flight on my Rotax 912ULS. Head temps got up into the higher portion so I landed let cool down and taxied back to the hanger and did a compression leak down everything was fine. Refilled with coolent and purged all air by running up to temp and checking it, running up to temp again and checking it until it was full every time. It has been fine since then. You need to look at your temperature sensors on the front and back of the engine and if the plastic insulator around the center is distorted or has melted it was overheated badly and should be checked. Hope all is fine good luck,
Tom
On Dec 30, 2012, at 2:03 PM, Ken Lyons <ninjaneer451(at)gmail.com (ninjaneer451(at)gmail.com)> wrote:
[quote]Hi John,
Sorry to hear about your troubles. I do not have any Rotax experience yet, but have had an engine lose compression after overheating. Twice. So your plan of attack seems reasonable. Since I am in Marysville, contact me if you could use an extra hand for anything. If you want to move the plane by ground, my pickup is available as well.
Best of luck,
Ken
On Sun, Dec 30, 2012 at 10:18 AM, John Marzulli <john.marzulli(at)gmail.com (john.marzulli(at)gmail.com)> wrote:
| Quote: | I need some Rotax advise as my plane is stranded at another airport.
The coolant overflow bottle failed in flight. The first sign was some red fluid in the cockpit a few minutes after take off. At first I thought it was brake fluid.
I noted the EGTs were high, but the CHTs were in range, and the oil temps were slightly high, but not in "the red zone"
A minute later I started smelling something in the cockpit and turned back to the field at reduced power.
A few minutes later I lost one of the CHT probes, but the other was reading fine. A few minutes after that I lost the other CHT probe. Oil temps at this point were still just into the yellow zone.
On the ground I pulled the cowling and found the coolant bottle had melted a hole at the point closest to the oil reservoir. The shrink wrap that holds the CHTS in place had melted and the CHT connectors had come out of position.
I was able to get some more DexCool and field replaced the coolant bottle with some attempts to heat shield it.
Runup and pre-flight were normal. The engine made normal power on take off. After climbing above the airport I noticed the CHTs were still high.
The engine was also only making 5100RPM in level flight with full throttle. I normally can exceed 5500 with my prop pitch.
I landed back and found a hangar to tuck it back in at.
So now the question is, what should I be looking for? The engine ran smooth. Shut down was brisk as always. Based on this I do not think one of the pistons is damaged.
The current plan is to compression test it, check the plugs and pull the oil filter to look for metal.
Does anyone else have any ideas?
John Marzulli
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
href="http://www.aeroelectric.com/">www.aeroelectric.com
href="http://www.buildersbooks.com/">www.buildersbooks.com
href="http://www.homebuilthelp.com/">www.homebuilthelp.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
href="http://www.matronics.com/Navigator?Zenith701801-List">http://www.matronics.com/Navigator?Zenith701801-List
href="http://forums.matronics.com/">http://forums.matronics.com
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b.carl@sympatico.ca
Joined: 20 May 2008
Posts: 77
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| Posted: Tue Jan 01, 2013 6:01 am Post subject: Need Rotax 912S Help To Get The 7-Oh-Fun Back Home |
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Hi John.
I hope I am wrong but when the CHT prob insulation melts, it usually means that the cylinder heads have over heated and lost their temper. A lower compression should result but only a hardness test will give you the answer.
A friend had a similar incident and had to replace all four heads, no other damage occurred.
1995 701 amphibs 912ul.
Carl
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