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06-30-2013, 02:44 PM
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Join Date: Jan 2006
Posts: 905
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John, Sorry I am not familiar with a CT. I can assure you pulling the carb. bowls on a 12 is no small task primarily due to a lack of access space. Can be done of course but it's one of those jobs where you have to disturb a number of components which sometimes wind up creating new problems in addition to that which you are trying to address.
Personally the more I think about this SB the less inclined I am to do anything in view of fact the little bugger is performing very nicely. After all the SB content doesn't really tell us to do anything other than change the pump out after five years, or if not there yet no later than May 2014, but rather at the next maintanence event which I presume is the next Condition Inspection. At any rate barring a more convincing bit of news that is my plan.
Dick Seiders 120093
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06-30-2013, 04:29 PM
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Join Date: Nov 2009
Location: Independence, OR
Posts: 316
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Dick- I haven't gotten to the point in my build where I am familiar with the -12 carb configuration.
On the CT, you have to remove the carb from the socket so you can lift it high enough above the drip trays to get at the bowl. Fortunately you can do this without removing fuel lines or linkages so no need to set up the carbs and balance them.
I was hoping the -12 would be easier, or at least no more difficult, than the CT. Sounds like that may not be the case.
__________________
John Horn (donated for 2020)
Independence, OR
LSRM-A, CFII
Rotax Service, Maintenance, and Heavy Maintenance Trained
Building an RV-12, N7878H reserved
Flying a Flight Design CTSW
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06-30-2013, 05:17 PM
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Join Date: Aug 2010
Location: Marshall TX (KASL)
Posts: 1,783
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Regarding the SB, there is an interesting personality type common amongst some engineers, lawyers, bureaucrats, legislators, certain European countries in particular, and companies that manufacture aircraft engines in Europe. It is the type that believes that "Everything must be either Mandatory or Forbidden." The fact that this "Recommended" (i.e. "Use your own judgement [?!!]") SB comes from such a mindset is quite telling and likely has a legalistic origin... Whatcha wanna bet it becomes mandatory? Or that the FAA turns it into an AD like the one they did on the bad fuel hoses?
Bill H. BSME La. Tech, '75 but quite iconoclastic for an engineer...
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06-30-2013, 08:14 PM
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Join Date: Dec 2008
Location: Lacey, WA
Posts: 1,365
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Checking carb bowls...
Now I am not one who would recommend pulling off the carb bowls on a sweetly running Rotax just because...but I have done it a couple times now and it is not difficult or scary. Remove the air cleaner, loosen the clamp holding the carb to the rubber socket and work the carb out of the socket. With all the linkages and hoses in place you can move it up enough to rotate the wire retainer aft and remove the bowl.

I had the oil tank off for the SB during my annual, but you don't need to have it off to get the carb bowl off. With the carb up like this you can also put your ball head allen wrench on the top right engine mount screw. I used Nord-lok washers on these so I check torque on them at annual. The screws haven't moved since the "troubles" a couple years ago. You also can check the rubber carb socket for any hardening or cracking. Mine are still fresh looking after 200 hours.
I have found that the gascolator screen does a good job of protecting the carbs, as you can see in this picture there is no debris in the fuel in the bowl. I use 92UL auto gas from high volume stations exclusively, with an occasional top up with 100LL when away from home.

It would probably be a good idea to have a spare bowl gasket on hand in case you damage one.
I put the carb balancer on after moving the carbs and found no change in the balance after moving the carbs.
So anyway, if you feel the need to look in the bowls, there is not much to fear.........although, my engine was running sooooo sweet and now after moving the carbs, do I detect a bit of roughness?
__________________
Tony
E-LSA RV-12 ULS
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06-30-2013, 08:44 PM
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Join Date: Nov 2011
Location: Hansville, Washington
Posts: 536
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Quote:
Originally Posted by Tony_T
Now I am not one who would recommend pulling off the carb bowls on a sweetly running Rotax just because...
So anyway, if you feel the need to look in the bowls, there is not much to fear.........although, my engine was running sooooo sweet and now after moving the carbs, do I detect a bit of roughness?
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Oh - Antonio - how could you? lawyers can't rule yer aeronautical life, or yer done for from the get-go..
If she's running sweetly, 'jes leave her that way.
Are you trying to please a bunch of Viennese lawyers sipping their Cappuccinos in some sidewalk cafe in Vienna???
Bob Bogash
N737G
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07-01-2013, 07:04 PM
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Join Date: Jan 2006
Location: Dallas, TX (ADS)
Posts: 2,180
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Quote:
Originally Posted by sandpiper
It's not that hard to check the carb bowels and I sure recommend it after cutting fuel hoses. Many of the Flight Design CT's turned 5 about a year ago and there were numerous problems related to particles in the fuel system after the mandated 5 yr hose change. Problems were related to hose brand but also carb hoses vs. FI hoses. But, the main problem appeared to be how carefully the hose was cut.
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We did OK after the 5-yr hose change on our CT. May have been our A&P, who worked on nothing but CTs.
We cleaned the carb bowls every annual. Too much junk accumulates in there and it was a simple task.
TODR
__________________
Doug "The Other Doug Reeves" Reeves
CTSW N621CT - SOLD but not forgotten
Home Bases LBX, BZN
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07-02-2013, 08:04 AM
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Join Date: Jan 2006
Posts: 905
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Tony, thanks for the great pics, but I suspect it does help on the rt side to have the oil tank off to get at the carb. The roughness you hear, feel, or imagine, would likely not be there if carbs were not moved around, but even if it's imagined thanks for making my point about messing with equpment that is running just fine.
Dick Seiders 120093
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07-02-2013, 12:39 PM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
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For those of you that might be wondering---yes you can use stainless braid teflon with crimped hose ends for your Rotax applications. I have several out there right now. For those using an ethanol fuel and a rubber hose, yep the 5 year replacement or sooner is advised. (If I can figure out how to post the pics, I will.)
Tom
__________________
Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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07-02-2013, 01:15 PM
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Join Date: Jan 2012
Location: Oconomowoc, WI
Posts: 460
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Tom asked me to post this picture.
As he mentioned, we are able to build Stainless Braid Conductive teflon hoses and adapt them to a rotax/jabiru, etc. engine. We can effectively eliminate the 5 year replacement issue by using a hose that has no time rated life. In addition, we are able to provide a much more compact package that is lighter than the standard rubber hoses at an incredible price point.
There are some additional pictures and more information at:
http://www.aircraftspecialty.com/kit...ses/hoses.html
click on the "Rotax" tab.
Or, please email Tom at tsflightlines@gmail.com.

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07-02-2013, 02:05 PM
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Join Date: May 2008
Location: Hillsboro, OR
Posts: 159
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Thanks Bill, Bob, Tony and Dick,
This is a good conversation to have. I'm nearing completion of my RV12 and it's equipped with the pump that the SB says to replace. I have a question and the answer may be obvious, but I'm going to ask it anyway. If one were not to install the new pump, and the old pump failed would the electric pump carry the load so I could get to the ground without falling?
Scott
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