---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sat 07/31/10: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:24 AM - 914 Fuel Press (h&jeuropa) 2. 08:47 AM - Re: 914 Fuel Press (Kevin Klinefelter) 3. 09:40 AM - Re: 914 Fuel Press (rparigoris) 4. 05:43 PM - maintenance intervals and paperwork (Roger Lee) 5. 05:47 PM - Rotax Line maint. check list (Roger Lee) 6. 05:51 PM - Magnetic oil plug check and 5 year rubber part replacement (Roger Lee) ________________________________ Message 1 _____________________________________ Time: 06:24:23 AM PST US Subject: RotaxEngines-List: 914 Fuel Press From: "h&jeuropa" On the 914 installed in our Europa we have a differential pressure gauge connected to the airbox and the fuel supply to measure fuel pressure as specified by Rotax. It has worked fine for over 150 hours. During the last 10 to 20 hours we notice the pressure varies during flight. It is nominally 3.5 psi as it should be but will increase up to 4.0 and decrease back to 3.3 or so. The change takes place over a few minutes and continues through the flight. The engine continues to run fine and all temperatures are consistent. The spark plugs look fine and all look the same. With our Condition Inspection coming up we're curious if anyone has any ideas of things to check. Jim & Heather Read this topic online here: http://forums.matronics.com/viewtopic.php?p=306924#306924 ________________________________ Message 2 _____________________________________ Time: 08:47:44 AM PST US From: "Kevin Klinefelter" Subject: Re: RotaxEngines-List: 914 Fuel Press Have you checked your fuel filter? Have you tried changing from main to reserve? Mine stays pretty consistent, changing with power setting. Kevin, 914 with 220 hrs ----- Original Message ----- From: "h&jeuropa" Sent: Saturday, July 31, 2010 6:24 AM Subject: RotaxEngines-List: 914 Fuel Press > > > On the 914 installed in our Europa we have a differential pressure gauge > connected to the airbox and the fuel supply to measure fuel pressure as > specified by Rotax. It has worked fine for over 150 hours. During the > last 10 to 20 hours we notice the pressure varies during flight. It is > nominally 3.5 psi as it should be but will increase up to 4.0 and decrease > back to 3.3 or so. The change takes place over a few minutes and > continues through the flight. The engine continues to run fine and all > temperatures are consistent. The spark plugs look fine and all look the > same. > > With our Condition Inspection coming up we're curious if anyone has any > ideas of things to check. > > Jim & Heather > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=306924#306924 > > > ________________________________ Message 3 _____________________________________ Time: 09:40:01 AM PST US Subject: RotaxEngines-List: Re: 914 Fuel Press From: "rparigoris" Hi Jim Differential pressure really won't have very much effect on mixture unless you are so low jets begin to suck air because fuel is not covering them or so high that pressure overcomes ability of needle valve to hold it back. Rotax says between ~ 2 and 5 PSI over airbox is enough to overcome but not over do it. On the high side many folks with parallel pumps blow right over the high side when both pumps are switched on with out too much of a problem. Can't speak from first hand experience, but if something changes it is worth a look into. Here are some ideas: **Gauge that is speaking with forked tongue. First off make sure senders have a good ground, running a ground specific wire to senders is a good idea in my book. There is always the chance that a sender has become irregular. Remember you have some very old gas in the line going to the fuel transducer. If it is mogas it could gum up. I plan to first fill this line and purge air from it using 100LL which is more better for not gumming things. May be worth a call to UMA to see if there is a cleaning procedure for sender and clean it, then purge it and run a ground specific wire from it. **Perhaps there really is fluctuation happening. Go over vacuum/pressure lines with a fine tooth comb, a small leak here could be doing you in, pinched hose same problem. **For hahas make sure your fuel tank vent is clear **Make sure your fuel filters or gasculators are clean and there are no leaks. Leak could allow air to get sucked in **Perhaps you imported some dog hair from Bob H. and it is clogging toe fuel outlet on tank? Does it happen on main and reserve? report back **Make sure you have a good ground going to your instrument **You didn't mention if pump 1, pump 2 or both pump one and two changes things, report back **If sender/transducer is working perfectly, gauge is working perfectly and plumbing is in order, it could always be the fuel pressure regulator. There is an adjustment on it, you could fool one way and the other a little bit and see if it helps. You may want to check with Bud or Lockwood to see if there is any magic goop to run through it if you use a lot of mogas **You still may have a plumbing leak, worth it to replace float bowl gaskets especial if you dropped float bowls to clean in there. There are other carb components that could have a potential leak going on but I think following through on above is a good place to start. I would be alot more worried if you see pressure hitting the low end. Perhaps you could borrow a fuel pressure regulator for testing? I think you just had a pump burn out on you, again try both pumps, perhaps the new pump is a bit flaky? There is a break in, did you fly it at least half a dozen hours? Perhaps there isn't full voltage going to pump because of a high resistance connection? Good luck Ron P. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=306961#306961 ________________________________ Message 4 _____________________________________ Time: 05:43:54 PM PST US Subject: RotaxEngines-List: maintenance intervals and paperwork From: "Roger Lee" Hi All, Here is list of the maintenance intervals and associated mandatory paperwork if you fly an SLSA and should be followed even if you fly an experimental. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=306990#306990 Attachments: http://forums.matronics.com//files/rotax_line_maint_paperwork_594.pdf http://forums.matronics.com//files/rotax_line_maint_intervals_853.pdf ________________________________ Message 5 _____________________________________ Time: 05:47:00 PM PST US Subject: RotaxEngines-List: Rotax Line maint. check list From: "Roger Lee" Here is a copy of the Rotax line maint. check list. You or your mechanic should use this every inspection and keep them as a running record for any changes. It makes sure you check every thing you should and will help from over looking a problem. Keeping these kinds of records will keep your resale value up. In the SLSA world of $120K airplanes, poor paperwork will cost you $5K-$10K in resale value. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=306992#306992 Attachments: http://forums.matronics.com//files/new_rotax_line_maint_manual_146.pdf ________________________________ Message 6 _____________________________________ Time: 05:51:31 PM PST US Subject: RotaxEngines-List: Magnetic oil plug check and 5 year rubber part replacement From: "Roger Lee" Here is a page out of the Rotax manual on what your magnetic oil plug should look like or not and it is a mandatory check at every oil change. Here is what needs to be changed on the Rotax 5 year rubber parts replacement. If you fly an SLSA then these are mandatory, but if you fly an experimental your not forced to, but it isn't in your best interest to let either of the above go. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=306993#306993 Attachments: http://forums.matronics.com//files/rotax_5_year_rubber_component_change_747.pdf http://forums.matronics.com//files/rotax_magnetic_plug_check_187.pdf ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.