  | 
				Matronics Email Lists Web Forum Interface to the Matronics Email Lists   
				 | 
			 
		 
		 
	
		| View previous topic :: View next topic   | 
	 
	
	
		| Author | 
		Message | 
	 
	
		kingsnjan(at)westnet.com. Guest
 
 
 
 
 
  | 
		
			
				 Posted: Sat Aug 13, 2011 3:17 am    Post subject: Europa-List Digest: 2 Msgs - 07/25/11 | 
				     | 
			 
			
				
  | 
			 
			
				Fellow Listers,
 
 Almost 3 weeks ago, Tony Renshaw posted the following plea on my behalf.  My 
 apologies for not repsonding before this but circumstances have prevented me 
 from doing so.
 I would sincerely like to thank those who came forward with suggestions 
 which are now repoduced below together with my responses / comments.  The 
 long and the short of it is that given the remoteness of our landing 
 aerodrome, the lack of testing equipment and time constraints, we left the 
 aircraft thankfully in a hangar and intend returning soon to retrieve it 
 with my trailer.
 
 Tony's posting . . . .
  	  | Quote: | 	 		   I've got a mate, who we all know, Kingsley, trying to fly a 914 a long 
  distance downunder that is giving him angst. Its running rough, real 
  rough. It seems that at boost power it just simply cuts out! Also, in 
  cruise when going to climb power it has begun to run really rough. He is a 
  long way from home trying to limp it home, so any suggestions would be 
  greatly appreciated. To elaborate, he has flown it 2 hours on AVGAS with 
  no obvious problem until going to climb power when it ran so rough they 
  had to pull the power back and land ASAP, luckily with an aerodrome 
  closeby. Now, it runs rough on the ground too….not sure of what power 
  settings but I recall they can't get boost happening. The local Rotax 
  agent says that AVGAS with lead can wreck a set of plugs in no time, so, 
  they have a new set of plugs about to be installed. Fuel will be drained 
  and high octane super unleaded mogas will be used instead. The system will 
  be drained. So, I'm wondering if ASAP those in the know can beam downunder 
  the "good goss" that can help Kingsley get this bird home.
 
 | 	  
 BRIAN DAVIS . . . .
  	  | Quote: | 	 		   Sorry to hear of Kingsley's troubles.  It is difficult to diagnose such a 
  problem remotely but there are a couple of obvious things to check.  If 
  the engine runs smoothly at lower power settings and cuts out at higher 
  power settings I would strongly suspect a fuel flow restriction as first 
  guess.  I suggest he does a fuel flow check to see if he is getting enough 
  flow.  Next check that there are no air leaks caused by carb mount 
  failure/pipes adrift/blocked.  Check both carbs are opening together/ no 
  problems with throttle cables.
 
 | 	  
 It could be ignition and changing the plugs and fuel at least eliminates 
 some things but it is unlikely that a short period on Avgas would cause plug 
 failure.
 
 Response . . .
 We are convinced the problem is fuel or rather lack of however, we did fuel 
 flow tests the result of which was 10 litres over a 4 minute period on each 
 of the two fuel pumps.  This equates to 150 LPH which is more than enough 
 for the 914.  Inspection of the gascolator and another filter revealed they 
 were as clean as a whistle.
 
 There were no visible signs of any fuel leaks around the float bowls, carb 
 mounts all appeared normal as did everything else we checked by looking and 
 feeling.  Both carbs opened very smoothly and in unison.  Both throttle 
 valves simultaneously contact idle stops and in turn, the full throttle 
 stops.  There was absolutely no sign of any sticking throttle cables.
 
 We replaced the fuel and fitted new spark plugs only because we were advised 
 to do so by the Rotax agent.  We were not convinced it would have any effect 
 (and it didn't) but we did as advised because we thought we had nothing to 
 lose.  We now have a spare set of spark plugs as a result of the exercise.
 
 JIM BROWN . . . . .
  	  | Quote: | 	 		   Try this. turn off the turbo with the Isolation switch....Do a run up, if 
  you get full power, and no missing, without the turbo, then leave the 
  turbo out of the circuit and fly home....
 The fuel regulator on top of the airbox is bad.  As the engine RPM is going 
 | 	  
 to full power, at about 4400 RPM the missing starts.,the fuel regulator on 
 top of the airbox, is supposed to shut off the return fuel, so that all fuel 
 is avaiable for the turbo. In other words the engine is starving for fuel 
 under boost. The engine will run just fine as a non-turbo.....
 
 Response . . . . .
 Turning the turbo isolation switch off was one thing we hadn't thought to 
 try Jim so when Tony relayed your message, I had high hopes it would be the 
 answer to a maiden's prayer.  Alas, it had no effect so you can imagine my 
 disappointment.  I am however convinced the problem IS the fuel pressure 
 regulator Jim but not having the equipment to do any tests and with very 
 limited tools available, we were unable to check it.  The fact that the 
 regulator is common to both carbs indicates to me a logical reason why the 
 engine completely cut like it did on 3 occasions.  On one occasion when the 
 throttle was left open, the engine all but stopped before it fired up again. 
 This aircraft had not been flown for 2 years and I suspect the diaphragm may 
 have dried out and become porous or some dried out fuel residue may be in 
 some orifice or something else just as sinister.  I may be talking crap here 
 because I have not yet seen the inside of a 914 regulator.
 Now that I have read your full posting, with hindsight and as a result of 
 the steep learning curve I have been on regarding the 914, maybe if I had 
 clamped off the fuel return line somewhat, we may have at least seen some 
 change in the running to confirm we might be on the right track.
 
 KEVIN KLINEFELTER . . . .
  	  | Quote: | 	 		   You can check the operation of the turbo wastegate on the ground. Observe 
  the wastegate arm move through it's test cycle when the master is turned 
  on, to see if it is sticking.
 Sounds like carburators to me. He can inspect and clean the float bowls 
 | 	  
 without removing the carbs from the engine ( 19 mm bolt on the bottom of the 
 bowls, torque to 5.5nm). Also make sure that the carbs are  balanced
 
 Response . . . .
 Wastegate works perfectly on turn on thanks Kevin.  Have repeatedly observed 
 it cycle as you suggested.  Because of the sophiscated fuel drain trays 
 under the carbs, we were unable to remove the float bowls and didn't have 
 sufficient tools to go any further.    However, a few weeks before we picked 
 up the aircraft, a yearly inspection was carried out during which the carbs 
 were both removed, checked and some gaskets replaced.  The carbs were also 
 balanced.  The complete cutting of the engine we experienced leads me to 
 believe it would not be the carbs because I cannot see two carbs failing 
 simultaneously  except for lack of fuel as aforementioned in my response to 
 Jim.
 
 WILLIAM DANIELL . . . .
  	  | Quote: | 	 		   I use 100% AVGAS and in my experience no it doesn't.  Plugs last 50 hours 
  no problem.  I have never had a set of plugs foul up in nearly 7  years - 
  I admit I change them every 25 hours.
 I have this sort of issue after an overhaul and it had to do with two 
 | 	  
 things.  Part of the problem was one of the tubes from the airbox the carb 
 had come loose and unbalanced the carbs
 Secondly the mating between the turbo and the engine was "out" - which meant 
 that the turbo was providing too much or too little boost relative to the 
 power setting.  We tested the system by making the wastegate "manual"  with
 a vernier cable.
 
 Response . . . .
 I agree with you about the AVGAS William.  The plugs in this engine had only 
 done 3.5 hrs at the time so it would need to be special Avgas to stuff them 
 in that amount of time.  On inspection, the plugs showed signs of running a 
 bit lean if anything which would be consistent with the rough running at 
 higher power settings I would think.  There was no sign of lead in them and 
 during the 4 hour return trip by car to purchase new plugs, we had the 
 removed plugs tested on a plug tester.  All were Ok.  I have not yet had the 
 chance to check the other items you mention William so am unable to comment 
 on those yet but they will be checked at a later stage thanks.
 
 PAUL McALLISTER . . . .
  	  | Quote: | 	 		   If Kingsley's airplane only has a couple of hours on it then I'd be 
  looking at the fuel filters.  I pulled an unbelievable amount of crap out 
  of the filters for the first 50 hours and I was very careful (or so I 
  thought) to make sure that fuel system was clean before my first flight.
 
 | 	  
 Response . . . . .
 This aircraft has done 330 hours Paul but nothing for 2 years.  As mentioned 
 earlier, we did check the filters to no avail and a fuel flow check proved 
 satisfactory.  When I finally get to flying my own aircraft Paul, rest 
 assured your suggestion will be strictly followed.
 
 Thank you again one and all for your contributions.  Many heads are 
 certainly better than a couple as bereft of 914 knowledge as ours were at 
 the time.  I will advise the outcome in due course.
 
 Best regards
 Kingsley
 
  |  | - The Matronics Europa-List Email Forum - |  |   |  Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
 
  http://www.matronics.com/Navigator?Europa-List |  
  |  
 
 
 
 
  | 
			 
		  | 
	 
	
		| Back to top | 
		 | 
	 
	
		  | 
	 
	
		Trevpond(at)aol.com Guest
 
 
 
 
 
  | 
		
			
				 Posted: Sat Aug 13, 2011 6:21 am    Post subject: Europa-List Digest: 2 Msgs - 07/25/11 | 
				     | 
			 
			
				
  | 
			 
			
				Kingsley,
  
 I have a 914 Engined XS Trigear.  
  
 A year or so ago, I had a rough running engine, had the Rotax Engineer up  
 just before the problem started to service it, and then the trouble  started.
  
 When I did the engine checks, all OK, even tried doing them with the  prop 
 fully coarse, still OK.  Start up the runway, push through the gate  into 
 full turbo, then the engine popped and banged and misfired!  Float  bowls were 
 checked, filters changed, fuel flow checked, jets checked, airbox  rubbers 
 checked, turbo wastegate checked, just about everything you could think  of
 
  |  | - The Matronics Europa-List Email Forum - |  |   |  Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
 
  http://www.matronics.com/Navigator?Europa-List |  
  |  
 
 
 
 
  | 
			 
		  | 
	 
	
		| Back to top | 
		 | 
	 
	
		  | 
	 
	
		frans(at)privatepilots.nl Guest
 
 
 
 
 
  | 
		
			
				 Posted: Sat Aug 13, 2011 11:14 am    Post subject: Europa-List Digest: 2 Msgs - 07/25/11 | 
				     | 
			 
			
				
  | 
			 
			
				On 08/13/2011 01:14 PM, Kingsley Hurst wrote:
 
  	  | Quote: | 	 		   The fuel regulator on top of the airbox is bad.  As the engine RPM is
  going to full power, at about 4400 RPM the missing starts.,the fuel
  regulator on top of the airbox, is supposed to shut off the return fuel,
  so that all fuel is avaiable for the turbo.
 
 | 	  
 No that is not how it works. It just maintains proper fuel pressure over
 the airbox pressure. It is just a pressure valve, opening the return if
 the pressure gets higher, closing it a bit more when the pressure gets
 lower.
 Even during full power plenty of fuel returns to the tank. This is
 intentional to overcome filter losses and to prevent vapor lock.
 
 This situation again shows the importance of a differential fuel
 pressure gauge. Why not install one now permanently, and see what is
 going on, now you have to hook up a gauge anyway? It is a must have for
 the 914. Without such a gauge you can't tell whether your regulator is
 working correctly, or that your filters are clogging, or whatever. If a
 differential fuel pressure gauge shows a healthy value you can pretty
 much rule out the majority of the fuel related problems.
 
 I would place my bets on the carb slides, just like Trev said. It is
 common that after some months out of use the slides get a very small
 layer of oxidation due to lack of fuel, and they get a bit "sticky". You
 might not notice it on the ground, but temperature changes might be
 enough to get the slides stuck during flight. There have been a couple
 of crashes exactly due to this phenomenon. If they get sticky they
 usually limit the power, or get stuck in the full power configuration
 and flood the engine when the pilot reduces power. In both instances the
 engine cuts, typically in an awkward situation.
 
  	  | Quote: | 	 		   I am however convinced the problem IS the
  fuel pressure regulator
 
 | 	  
 Without a differential gauge you really can't tell.
 
  	  | Quote: | 	 		   Now that I have read your full posting, with hindsight and as a result
  of the steep learning curve I have been on regarding the 914, maybe if I
  had clamped off the fuel return line somewhat, we may have at least seen
  some change in the running to confirm we might be on the right track.
 
 | 	  
 It wouldn't tell anything, even if the engine runs better. You might
 overcome the improper mixture due to a stuck slide by changing the fuel
 pressure outside the normal range, but for sure this fix wouldn't be
 airworthy. It would be similar like intentionally clogging the fuel
 filter to keep your engine running with the choke stuck in the activated
 position. Clogging the fuel filter would make the engine run better in
 this situation, but it wouldn't be an airworthy fix either. Never mess
 with the fuel return of the 914, or you risk flooding the carbs. Proper
 fuel pressure is of utter importance for the 914.
 
 Frans
 
  |  | - The Matronics Europa-List Email Forum - |  |   |  Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
 
  http://www.matronics.com/Navigator?Europa-List |  
  |  
 
 
 
 
  | 
			 
		  | 
	 
	
		| Back to top | 
		 | 
	 
	
		  | 
	 
	
		grahamsingleton(at)btinte Guest
 
 
 
 
 
  | 
		
			
				 Posted: Sat Aug 13, 2011 2:39 pm    Post subject: Europa-List Digest: 2 Msgs - 07/25/11 | 
				     | 
			 
			
				
  | 
			 
			
				Kingsley
 can't remember but did you check the carbs? Standing for a couple of years isn't good, all sorts of crap comes out of the fuel including sometimes bacteria/yeast deposits which can block small jets in the carbs
 I just cleaned my Andair gascolator after a year with not much running and that had a fair amount of sludge in it. 
 Graham
 From: Kingsley Hurst <kingsnjan(at)westnet.com.au>
 To: europa-list(at)matronics.com
 Sent: Saturday, 13 August, 2011  12:14:19
 Subject: Re: Re: Europa-List Digest: 2 Msgs - 07/25/11
 
 --> Europa-List message posted by: "Kingsley Hurst" <kingsnjan(at)westnet.com.au (kingsnjan(at)westnet.com.au)>
 
 Fellow Listers,
 
 Almost 3 weeks ago, Tony Renshaw posted the following plea on my behalf.  My apologies for not repsonding before this but circumstances have prevented me from doing so.
 I would sincerely like to thank those who came forward with suggestions which are now repoduced below together with my responses / comments.  The long and the short of it is that given the remoteness of our landing aerodrome, the lack of testing equipment and time constraints, we left the aircraft thankfully in a hangar and intend returning soon to retrieve it with my trailer.
 
 Tony's posting . . . .
  	  | Quote: | 	 		   I've got a mate, who  we all know, Kingsley, trying to fly a 914 a long distance downunder that is giving him angst. Its running rough, real rough. It seems that at boost power it just simply cuts out! Also, in cruise when going to climb power it has begun to run really rough. He is a long way from home trying to limp it home, so any suggestions would be greatly appreciated. To elaborate, he has flown it 2 hours on AVGAS with no obvious problem until going to climb power when it ran so rough they had to pull the power back and land ASAP, luckily with an aerodrome closeby. Now, it runs rough on the ground too….not sure of what power settings but I recall they can't get boost happening. The local Rotax agent says that AVGAS with lead can wreck a set of plugs in no time, so, they have a new set of plugs about to be installed. Fuel will be drained and high octane super unleaded mogas will be used instead. The system will be drained. So, I'm wondering if ASAP those in the know  can beam downunder the "good goss" that can help Kingsley get this bird home.
 
 | 	  
 BRIAN DAVIS . . . .
  	  | Quote: | 	 		   Sorry to hear of Kingsley's troubles.  It is difficult to diagnose such a problem remotely but there are a couple of obvious things to check.  If the engine runs smoothly at lower power settings and cuts out at higher power settings I would strongly suspect a fuel flow restriction as first guess.  I suggest he does a fuel flow check to see if he is getting enough flow.  Next check that there are no air leaks caused by carb mount failure/pipes adrift/blocked.  Check both carbs are opening together/ no problems with throttle cables.
 
 | 	  
 It could be ignition and changing the plugs and fuel at least eliminates some things but it is unlikely that a short period on Avgas would cause plug failure.
 
 Response . . .
 We are convinced the problem is fuel or rather lack of however, we did fuel flow tests the result of  which was 10 litres over a 4 minute period on each of the two fuel pumps.  This equates to 150 LPH which is more than enough for the 914.  Inspection of the gascolator and another filter revealed they were as clean as a whistle.
 
 There were no visible signs of any fuel leaks around the float bowls, carb mounts all appeared normal as did everything else we checked by looking and feeling.  Both carbs opened very smoothly and in unison.  Both throttle valves simultaneously contact idle stops and in turn, the full throttle stops.  There was absolutely no sign of any sticking throttle cables.
 
 We replaced the fuel and fitted new spark plugs only because we were advised to do so by the Rotax agent.  We were not convinced it would have any effect (and it didn't) but we did as advised because we thought we had nothing to lose.  We now have a spare set of spark plugs as a result of the exercise.
 
 JIM BROWN . .  . . .
  	  | Quote: | 	 		   Try this. turn off the turbo with the Isolation switch....Do a run up, if you get full power, and no missing, without the turbo, then leave the turbo out of the circuit and fly home....
 The fuel regulator on top of the airbox is bad.  As the engine RPM is going to full power, at about 4400 RPM the missing starts.,the fuel regulator on top of the airbox, is supposed to shut off the return fuel, so that all fuel is avaiable for the turbo. In other words the engine is starving for fuel under boost. The engine will run just fine as a non-turbo.....
 | 	  
 
 Response . . . . .
 Turning the turbo isolation switch off was one thing we hadn't thought to try Jim so when Tony relayed your message, I had high hopes it would be the answer to a maiden's prayer.  Alas, it had no effect so you can imagine my disappointment.  I am however convinced the problem IS the fuel pressure regulator Jim but not having the equipment to do any  tests and with very limited tools available, we were unable to check it.  The fact that the regulator is common to both carbs indicates to me a logical reason why the engine completely cut like it did on 3 occasions.  On one occasion when the throttle was left open, the engine all but stopped before it fired up again. This aircraft had not been flown for 2 years and I suspect the diaphragm may have dried out and become porous or some dried out fuel residue may be in some orifice or something else just as sinister.  I may be talking crap here because I have not yet seen the inside of a 914 regulator.
 Now that I have read your full posting, with hindsight and as a result of the steep learning curve I have been on regarding the 914, maybe if I had clamped off the fuel return line somewhat, we may have at least seen some change in the running to confirm we might be on the right track.
 
 KEVIN KLINEFELTER . . . .
  	  | Quote: | 	 		   You can check  the operation of the turbo wastegate on the ground. Observe the wastegate arm move through it's test cycle when the master is turned on, to see if it is sticking.
 Sounds like carburators to me. He can inspect and clean the float bowls without removing the carbs from the engine ( 19 mm bolt on the bottom of the bowls, torque to 5.5nm). Also make sure that the carbs are  balanced
 | 	  
 
 Response . . . .
 Wastegate works perfectly on turn on thanks Kevin.  Have repeatedly observed it cycle as you suggested.  Because of the sophiscated fuel drain trays under the carbs, we were unable to remove the float bowls and didn't have sufficient tools to go any further.    However, a few weeks before we picked up the aircraft, a yearly inspection was carried out during which the carbs were both removed, checked and some gaskets replaced.  The carbs were also balanced.  The complete cutting of the engine we experienced leads me  to believe it would not be the carbs because I cannot see two carbs failing simultaneously  except for lack of fuel as aforementioned in my response to Jim.
 
 WILLIAM DANIELL . . . .
  	  | Quote: | 	 		   I use 100% AVGAS and in my experience no it doesn't.  Plugs last 50 hours no problem.  I have never had a set of plugs foul up in nearly 7  years - I admit I change them every 25 hours.
 I have this sort of issue after an overhaul and it had to do with two things.  Part of the problem was one of the tubes from the airbox the carb had come loose and unbalanced the carbs
 | 	  
 Secondly the mating between the turbo and the engine was "out" - which meant that the turbo was providing too much or too little boost relative to the power setting.  We tested the system by making the wastegate "manual"  with
 a vernier cable.
 
 Response . . . .
 I agree with you about the AVGAS William.  The plugs in this engine had only  done 3.5 hrs at the time so it would need to be special Avgas to stuff them in that amount of time.  On inspection, the plugs showed signs of running a bit lean if anything which would be consistent with the rough running at higher power settings I would think.  There was no sign of lead in them and during the 4 hour return trip by car to purchase new plugs, we had the removed plugs tested on a plug tester.  All were Ok.  I have not yet had the chance to check the other items you mention William so am unable to comment on those yet but they will be checked at a later stage thanks.
 
 PAUL McALLISTER . . . .
  	  | Quote: | 	 		   If Kingsley's airplane only has a couple of hours on it then I'd be looking at the fuel filters.  I pulled an unbelievable amount of crap out of the filters for the first 50 hours and I was very careful (or so I thought) to make sure that fuel system was clean before my first flight.
 
 | 	  
 Response . . . .  .
 This aircraft has done 330 hours Paul but nothing for 2 years.  As mentioned earlier, we did check the filters to no avail and a fuel flow check proved satisfactory.  When I finally get to flying my own aircraft Paul, rest assured your suggestion will be strictly followed.
 
 Thank you again one and all for your contributions.  Many heads are certainly better than a couple as bereft of 914 knowledge as ours were at the time.  I will advise the outcome in due course.
 
 Best regards
 K href="http://www.matronics.com/Navigator?Europa-List" target="_blank">p;                 -Matt Dralle, Libution" =======
 
     
  [quote][b]
 
  |  | - The Matronics Europa-List Email Forum - |  |   |  Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
 
  http://www.matronics.com/Navigator?Europa-List |  
  |  
 
 
 
 
  | 
			 
		  | 
	 
	
		| Back to top | 
		 | 
	 
	
		  | 
	 
	
		kingsnjan(at)westnet.com. Guest
 
 
 
 
 
  | 
		
			
				 Posted: Sat Aug 13, 2011 7:53 pm    Post subject: Europa-List Digest: 2 Msgs - 07/25/11 | 
				     | 
			 
			
				
  | 
			 
			
				Trev,
   
  Many thanks for this heads-up.  As I said in my posting, the carbs  were removed and checked during the inspection and since I have no reason to  doubt the integrity of the engineer, I have been tending to believe they should  not be causing trouble.  I have seen stranger things happen in the past so  rest assured I will definitely check out the slides once I have the means to be  able to do so.
   
  Really do appreciate the input from you 914 fellows.  
   
  Cheers
  Kingsley
   
   
  [quote]   ---
 
  |  | - The Matronics Europa-List Email Forum - |  |   |  Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
 
  http://www.matronics.com/Navigator?Europa-List |  
  |  
 
 
 
 
  | 
			 
		  | 
	 
	
		| Back to top | 
		 | 
	 
	
		  | 
	 
	
		kingsnjan(at)westnet.com. Guest
 
 
 
 
 
  | 
		
			
				 Posted: Sat Aug 13, 2011 8:23 pm    Post subject: Europa-List Digest: 2 Msgs - 07/25/11 | 
				     | 
			 
			
				
  | 
			 
			
				Hello Frans and thank you too for your input.
 
  	  | Quote: | 	 		   No that is not how it works. It just maintains proper fuel pressure over
  the airbox pressure. It is just a pressure valve, opening the return if
  the pressure gets higher, closing it a bit more when the pressure gets
  lower.
 
 | 	  
 I was unaware of how the regulator works and still am to a large degree. 
 What you say makes sense and when I get a chance to read some 914 
 literature, I hope to understand a lot more things about the 914.
 
  	  | Quote: | 	 		   This situation again shows the importance of a differential fuel
  pressure gauge. Why not install one now permanently, and see what is
  going on, now you have to hook up a gauge anyway? It is a must have for
  the 914. Without such a gauge you can't tell whether your regulator is
  working correctly, or that your filters are clogging, or whatever. If a
  differential fuel pressure gauge shows a healthy value you can pretty
  much rule out the majority of the fuel related problems.
 
 | 	  
 After the experience we had and seeing where the fuel pressure is taken from 
 on this aircraft, I couldn't agree with you more Frans.  Subsequent to 
 viewing the Rotax Owners video on testing the regulator, I had already 
 decided that a differential fuel pressure gauge is the meaningful way to go. 
 The fuel pressure readings we are getting on this aircraft are next to 
 useless on a 914.
 
  	  | Quote: | 	 		   I would place my bets on the carb slides, just like Trev said. It is
  common that after some months out of use the slides get a very small
  layer of oxidation due to lack of fuel, and they get a bit "sticky".
 
 | 	  
 As I said to Trev, this will be thoroughly checked out and now that I have 
 been made aware of this phenomenon, I am certainly not discounting this as 
 the cause.
 
  	  | Quote: | 	 		  > I am however convinced the problem IS the
 > fuel pressure regulator
 
  Without a differential gauge you really can't tell.
 
 | 	  
 Well you will be pleased to know I am now not so convinced given the 
 revelations about the carb slides.  I agree that without a differential 
 gauge I won't be able to tell and this is another test that I will be 
 carrying out.
 
  	  | Quote: | 	 		  > Now that I have read your full posting, with hindsight and as a result
 > of the steep learning curve I have been on regarding the 914, maybe if I
 > had clamped off the fuel return line somewhat, we may have at least seen
 > some change in the running to confirm we might be on the right track.
 
  It wouldn't tell anything, even if the engine runs better. You might
  overcome the improper mixture due to a stuck slide by changing the fuel
  pressure outside the normal range, but for sure this fix wouldn't be
  airworthy. It would be similar like intentionally clogging the fuel
  filter to keep your engine running with the choke stuck in the activated
  position. . . . . . . .
 
 | 	  
 I wasn't for a moment suggesting that restricting the return line would be a 
 FIX Frans, rather, I thought that in the middle of nowhere like we were (up 
 the creek without a paddle so to speak!) it just might have been a method to 
 help diagnose the problem but as you have pointed out, it might also have 
 given us a bum steer.
 
 Thanks again Frans.
 
 Kingsley
 
  |  | - The Matronics Europa-List Email Forum - |  |   |  Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
 
  http://www.matronics.com/Navigator?Europa-List |  
  |  
 
 
 
 
  | 
			 
		  | 
	 
	
		| Back to top | 
		 | 
	 
	
		  | 
	 
	
		kingsnjan(at)westnet.com. Guest
 
 
 
 
 
  | 
		
			
				 Posted: Sat Aug 13, 2011 8:44 pm    Post subject: Europa-List Digest: 2 Msgs - 07/25/11 | 
				     | 
			 
			
				
  | 
			 
			
				G'day Graham,
   
  > can't remember but did you check  the carbs? Standing for a couple of years isn't good, all sorts of crap comes  out of the fuel including sometimes bacteria/yeast deposits which can block  small jets in the > carbs
 
  No we didn't check the  carbs Graham because we didn't have the means to be able to do  so.   The engineer who completed the inspection however, assured us  that he had checked them thoroughly.  Once we get the aircraft home, I will  be able to check all items put forward by our fellow Europa owners and will  hopefully be able to advise the outcome.  This might take some time however  because we are in the process of shifting house, getting a hangar built, doing  final touches to the trailer to enable a 4,000 km round trip to rescue the  aircraft and so it goes on . . .. . Arrrrrh !
   
  > I just cleaned my Andair gascolator after a year with  not much running and that had a fair amount of sludge in it. 
   
  On checking our gascolator, I found it could not have  been cleaner thanks mate.
   
  My son and I were so much looking forward to a great trip  home but it wasn't to be.  As well as the eventual engine problem, we  couldn't go home the way we wished to go because of the shocking weather  Melbourne put on for us.  It was for this reason, we tried to go around the  coast ending up in Mallacoota, the most South Easterly seaside township on the  Australian mainland.  Just a bit of trivia!
   
  Cheers
  Kingsley
     [quote][b]
 
  |  | - The Matronics Europa-List Email Forum - |  |   |  Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
 
  http://www.matronics.com/Navigator?Europa-List |  
  |  
 
 
 
 
  | 
			 
		  | 
	 
	
		| Back to top | 
		 | 
	 
	
		  | 
	 
	
		 | 
	 
 
  
	 
	    
	   | 
	
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You can download files in this forum
  | 
   
 
  
Powered by phpBB © 2001, 2005 phpBB Group
  
		 |