---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Mon 07/31/06: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:27 AM - Re: Re: RotaxEngines-List Digest: Squeak on Rotax 912S (MR PAUL MITCHELL) 2. 06:19 AM - Engine Fuel Return Line (Hugh McKay III) 3. 08:18 AM - Re: Engine Fuel Return Line (MR PAUL MITCHELL) 4. 05:15 PM - Matronics Email List Web Server Upgrade Tonight... (Matt Dralle) 5. 05:56 PM - Re: Matronics Email List Web Server Upgrade Tonight... (Jack Kuehn) 6. 07:20 PM - Date of Manufacture (Hugh McKay III) ________________________________ Message 1 _____________________________________ Time: 03:27:59 AM PST US From: "MR PAUL MITCHELL" Subject: Re: RotaxEngines-List: Re: RotaxEngines-List Digest: Squeak on Rotax 912S --> RotaxEngines-List message posted by: "MR PAUL MITCHELL" Duncan, Sorry for the delay in replying Carb balance, (factory set slow running stops out) also slow running mixture. I have just spent a week at Glenforsa on Mull and did the flight home to Hinton in the Hedges with a tea stop at Carlisle in 3hrs 55mins airtime on 55 litters at 110knots against a 10knot headwind. The engine is in a Tecnam Sierra. (Squeak still there.) Paul ----- Original Message ----- Sent: Thursday, July 20, 2006 9:10 PM Rotax 912S > --> RotaxEngines-List message posted by: "Duncan McFadyean" > > > Paul, > May we benefit from the knowledge of what was otherwise done to make your > engine much sweeter? > > Duncan McF. > ----- Original Message ----- > Sent: Thursday, July 20, 2006 9:34 AM > Rotax 912S > > >> --> RotaxEngines-List message posted by: "MR PAUL MITCHELL" >> >> >> My 20 hour old engine has the same squeak under all those conditions. I >> was also told that was "How they are" I also had other concerns. It took >> the intervention of the MD from the aircraft manufacturer in Italy direct >> to Rotax in Austria to get the Agent in UK to even come and look. After >> the intervention, a really positive visit took place. I now have a much >> sweeter engine with a squeak. >> Paul Mitchell >> >> >> ----- Original Message ----- >> Sent: Wednesday, July 19, 2006 10:24 PM >> Rotax 912S >> >> >>> --> RotaxEngines-List message posted by: "Duncan McFadyean" >>> >>> >>> I've had the squeak for 300 hours; either when pulling the prop trough >>> by >>> hand or on shutdown. I'm pretty sure it is the dog clutch (i.e. NOT the >>> slipper clutch) that produces this. >>> >>> I complained to my local Rotax agent when it was new. He said I was just >>> a >>> trouble maker! This is the level of service that can be expected from >>> Rotax's illegal and anti-competitive policy of 'one Country, one Agent'. >>> >>> Duncan McF. >>> ----- Original Message ----- >>> Sent: Monday, July 17, 2006 10:50 PM >>> 912S >>> >>> >>>> --> RotaxEngines-List message posted by: "John M. Goodings" >>>> >>>> >>>> After flying our CH601HD with Rotax 912S (100 hours) last weekend, we >>>> had >>>> occasion to pull the prop through by hand. When pulled quickly, a >>>> squeak >>>> was heard from the front of the engine; the engine was hot. When we >>>> ran >>>> the engine again after lunch, the squeak was heard again for the last >>>> couple of blade rotations before the prop stopped. We had heard from >>>> an >>>> expert AME on Rotax engines that a few certified 912S engines had been >>>> assembled with an incorrect part in the slipper clutch in the gear box. >>>> (The mating surfaces of the clutch hub and the dog gear should both >>>> have >>>> an angle of 7 degrees, whereas one of the parts in the faulty >>>> assemblies >>>> had an angle of 0 degrees, meeting the other part at the wrong angle.) >>>> There was the possibility that some uncertified engines like ours had >>>> suffered a similar fate. Thus, our gear box was opened up by the >>>> expert >>>> AME; however, the correct parts had been installed. It was reassembled >>>> by >>>> him (with great care; it had to sit overnight for the correct Loctite >>>> sealant to set). When the engine was run approximately 40 hours later, >>>> the squeak had disappeared. We would be interested to learn if any >>>> other >>>> 912S users have encountered this characteristic squeak. If so, were >>>> they >>>> able to determine a clear-cut cause? >>>> >>>> John Goodings, C-FGPJ, CH601HD with R912S, Toronto/Waterloo. >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>> >>> >>> >>> >>> http://www.matronics.com/Navigator?RotaxEngines-List >>> http://wiki.matronics.com >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> -- >>> No virus found in this incoming message. >>> >>> >> >> >> >> http://www.matronics.com/Navigator?RotaxEngines-List >> http://wiki.matronics.com >> >> >> >> >> >> >> >> >> >> >> > > > http://www.matronics.com/Navigator?RotaxEngines-List > http://wiki.matronics.com > > > -- > No virus found in this incoming message. > ________________________________ Message 2 _____________________________________ Time: 06:19:54 AM PST US From: "Hugh McKay III" Subject: RotaxEngines-List: Engine Fuel Return Line I have a question about the engine fuel return line on my Rotax 912UL, you know the one running from the neck-5 fuel manifold back to the main fuel tank? In addition to the orifice in the manifold outlet going to the pressure gauge, the outlet for the hose going back to the main fuel tank has an orifice also. Does this line constantly return a certain amount of fuel to the tank? If so, why? What is its function and why does it have an orifice in it? I would really like to understand this! Hugh McKay ________________________________ Message 3 _____________________________________ Time: 08:18:00 AM PST US From: "MR PAUL MITCHELL" Subject: Re: RotaxEngines-List: Engine Fuel Return Line Hugh, The orifice in the line to the fuel pressure sensor is to stop pulsations at the fuel pressure gauge. The orifice in the return line to the tank is to get rid of air or vapour locks, especially if using mogas. It obviously has to be a restriction or you would not have any fuel pressure to the carburettors. I cannot remember how much fuel goes back to the tank, maybe gallon an hour. I know if I fly for three hours on both tanks on my Tecnam Sierra , the right tank has some 2 gallons less than the left, some from the right returning to the left tank. Paul Mitchell ----- Original Message ----- From: Hugh McKay III To: rotaxengines-list@matronics.com Sent: Monday, July 31, 2006 2:18 PM Subject: RotaxEngines-List: Engine Fuel Return Line I have a question about the engine fuel return line on my Rotax 912UL, you know the one running from the neck-5 fuel manifold back to the main fuel tank? In addition to the orifice in the manifold outlet going to the pressure gauge, the outlet for the hose going back to the main fuel tank has an orifice also. Does this line constantly return a certain amount of fuel to the tank? If so, why? What is it's function and why does it have an orifice in it? I would really like to understand this! Hugh McKay ------------------------------------------------------------------------- ----- No virus found in this incoming message. 28-Jul-06 ________________________________ Message 4 _____________________________________ Time: 05:15:45 PM PST US From: Matt Dralle Subject: RotaxEngines-List: Matronics Email List Web Server Upgrade Tonight... --> RotaxEngines-List message posted by: Matt Dralle Dear Listers, This evening I will be upgrading the Matronics Web Server hardware to a new Quad-processor 2.8Ghz Xeon system (yes, 4-physical CPUs!) with an Ultra 320 SCSI Raid 5 disk system and 5GB of DDR2 RAM. As with the older system, the new system will be running the latest version of Redhat Linux. Most of the software configuration work is already done for the migration, but I still have to sync all of the archive and forum data from the old system to the new system. I am anticipating about 2 to 3 hours of downtime for me to fully make the transition, although it could be considerable less if everything goes according to plan. The Matronics Webserver will be *UNavailable* from the Internet during the work, and you will receive a time-out if you try to connect during the upgrade. Email List Distribution will be *available* during the upgrade of the Web Server, and List message distribution will function as normal. This represents a significant performance upgrade for the Matronics Web Server and you should notice nicely improved searching and surfing performance following the upgrade! Best regards, Matt Dralle Matronics Email List Administrator ________________________________ Message 5 _____________________________________ Time: 05:56:50 PM PST US From: Jack Kuehn Subject: Re: RotaxEngines-List: Matronics Email List Web Server Upgrade Tonight... --> RotaxEngines-List message posted by: Jack Kuehn Thank you Matt, you ROCK! I am sure you are aware that the information exchanged here can save not only very expensive engines but also lives. Jack ________________________________ Message 6 _____________________________________ Time: 07:20:44 PM PST US From: "Hugh McKay III" Subject: RotaxEngines-List: Date of Manufacture How can I tell the date of manufacture from a Rotax 912UL engine serial number? My Rotax 912UL has S/N 4406269. Hugh McKay