---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Wed 02/03/10: 12 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:44 AM - Gearbox shimming (Catz631@aol.com) 2. 06:29 AM - Re: Speaking of coolant hoses... (lucien) 3. 06:40 AM - Re: Speaking of coolant hoses... (lucien) 4. 07:12 AM - Re: Gearbox shimming (rampil) 5. 09:12 AM - Re: HOSE FOR ROTAX 912 (Goodone) 6. 11:32 AM - Re: HOSE FOR ROTAX 912 (lucien) 7. 12:49 PM - Re: HOSE FOR ROTAX 912 (Goodone) 8. 01:19 PM - Re: Speaking of coolant hoses... (Goodone) 9. 04:05 PM - Re: Re: HOSE FOR ROTAX 912 (Noel Loveys) 10. 04:56 PM - Re: Re: HOSE FOR ROTAX 912 (Noel Loveys) 11. 07:15 PM - New rules affetive April 2nd (Roger Lee) 12. 07:23 PM - Re: Gearbox shimming (Roger Lee) ________________________________ Message 1 _____________________________________ Time: 05:44:17 AM PST US From: Catz631@aol.com Subject: RotaxEngines-List: Gearbox shimming I just completed my Rotax 912 refresher course and I believe I have found the source of my occasional kickback/dieseling on shutdown that I have mentioned on this forum several times. This may not be a good description but essentially sometimes when shutting the engine down the prop would turn backwards 3 or 4 revolutions. Now, on occasion, during cold start, the engine will hang at around 1200 rpm and no amount of throttle will pull it out of that rpm. The engine just shakes and it screws up the carb fuel flow(ie: float and needle bouncing up and down) . I have to turn off the ignition and do it again The instructor seems to think these two problems indicate weak Bellevue (sp) washers in the gearbox. My engine is older than most of yours, I suspect(1993)It only has 230 hours but over time these springs have weakened and it is shim time.( as well as overhaul time if my plane was not experimental) The theory is the weakened springs have allowed the "dogs' to separate at shutdown and to flip the prop backwards on the backside of the "hill" of the dog,so to speak. It is difficult to explain without the parts in front of you. I am thinking about installing the slipper clutch also as my engine does not have one. Soooo now I have to make a tool to remove the gearbox. Dick Maddux 912UL Milton,Fl ________________________________ Message 2 _____________________________________ Time: 06:29:46 AM PST US Subject: RotaxEngines-List: Re: Speaking of coolant hoses... From: "lucien" rickofudall wrote: > Lucien, This is Spruce's table for 3003-O tubing. The least of the tubing used for lines. For formability, I'd go with 5052-O, it's not heat treated and you can get it both in .035 and .049. I'd be perfectly happy with the .035. If you aren't worried about weight, go with copper tubing and polish it up. When I ran air lines in my shop I checked the spec on the thinest wall copper in 3/4" and it was rated to over 1000 psi. > > Rick > 5052-0 .049 is what I went ahead and ordered with the beader, so that's what I'll be using. I thought about copper but I've also heard about possible corrosion problems with it. And I'm probably not going to need lengths that long to justify it, so just went with Al. Hope to get it before the weekend so I can get the job done.... LS -------- LS Titan II SS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=284705#284705 ________________________________ Message 3 _____________________________________ Time: 06:40:00 AM PST US Subject: RotaxEngines-List: Re: Speaking of coolant hoses... From: "lucien" VIXEN wrote: > What is wrong with using automotive hoses on the Rotax? Many of the late model vehicles have very creative hose assemblies and if you visit the warehouse section of your local auto supplier you can quite often find a very nicely shaped hose with just the right preformed bends that eliminates many of the connected elbows necessary when using straight hoses. It seems to me that one fairly continuous formed hose if safer than connected bits. After all, how many of us change out our auto hoses every few years and how many actually fail. I believe the pressures would be quite similar to modern vehicles. Comments? > Well that's the problem. I've not been able to find any pre-formed coolant hose that'll fit my particular installation. My blood pressure now just starts going into the yellow zone when I try to find these, so I've just accepted that I'm going to have to manufacture my own. JD (the original builder) got lucky on the radiator-to-water-pump hose originally but the top hose is fabricated with a bypass valve for a cabin heat system. I can locate 90 degree and one 135 degree bend (needed on the top hose) tho but nothing that'll fit alone. Rotax actually recommends using pipes in the installation manual for longer runs instead of long hoses so I don't feel bad about splicing them. As for the type of hose, Rotax dealers have told me to just use a good quality automotive radiator hose, there's no Unobtainium material requirement here fortunately, just regular automotive stuff suffices. I prefer Gates and fortunately that's available locally (gates is what's on the plane right now and it's still in good shape except for the one tube that's a little chewed up on one end). The specs on the hose are in the installation manual too. Looking forward to finally getting this done when I get the tools. That one hose has been a splinter in my mind for a while and it'll be good to finally extract it ;) LS -------- LS Titan II SS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=284707#284707 ________________________________ Message 4 _____________________________________ Time: 07:12:27 AM PST US Subject: RotaxEngines-List: Re: Gearbox shimming From: "rampil" Hi Dick, Which course did you attend? Was it in Sebring? ijr -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=284718#284718 ________________________________ Message 5 _____________________________________ Time: 09:12:38 AM PST US Subject: RotaxEngines-List: Re: HOSE FOR ROTAX 912 From: "Goodone" I have just be told of a fuel line hose called Barricade Fuel Hose. This is supposed to be a new product (at NAPA anyway) made by Gates and safe for use with fuel containing alcohol. Evidently it costs less than $2 per foot. Anyone using it? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=284732#284732 ________________________________ Message 6 _____________________________________ Time: 11:32:13 AM PST US Subject: RotaxEngines-List: Re: HOSE FOR ROTAX 912 From: "lucien" rampil wrote: > Hi Dick, > > You are absolutely correct, the coolant hose is 17 mm and should be > available from any hose shop. > > I bought mine locally and just had to tell the clerk that it was for a marine > inboard engine since they don't sell to aircraft! Same deal when I had > to originally buy inner tubes for the nose gear - the local tire shops will > only sell the tubes if they are for a go-kart, not an aircraft! > > Ira May I ask what shop that was and where? I havn't been able to locate 17mm heater hose anywhere in America except for Rotax dealers, so naturally I'm highly interested in where you obtained it?... Thanks, LS -------- LS Titan II SS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=284744#284744 ________________________________ Message 7 _____________________________________ Time: 12:49:24 PM PST US Subject: RotaxEngines-List: Re: HOSE FOR ROTAX 912 From: "Goodone" Please note that I am talking about fuel line. I was told that the product is new and that NAPA stores are stalking it. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=284746#284746 ________________________________ Message 8 _____________________________________ Time: 01:19:32 PM PST US Subject: RotaxEngines-List: Re: Speaking of coolant hoses... From: "Goodone" I am familiar with Rotax 912 powered homebuilt aircraft using coolant lines made of corrugated stainless steel tubing (CSST) like that used for natural gas installations in your home. This stuff is very flexible and would seem to be be a good candidate for use in aircraft cooling systems. The flexible CSST is attached at its end with short rubber sections of coolant hose and clamps. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=284748#284748 ________________________________ Message 9 _____________________________________ Time: 04:05:51 PM PST US From: "Noel Loveys" Subject: RE: RotaxEngines-List: Re: HOSE FOR ROTAX 912 Anything using a synthetic butyrate rubber should be ok. Noel -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Goodone Sent: February 3, 2010 1:42 PM Subject: RotaxEngines-List: Re: HOSE FOR ROTAX 912 I have just be told of a fuel line hose called Barricade Fuel Hose. This is supposed to be a new product (at NAPA anyway) made by Gates and safe for use with fuel containing alcohol. Evidently it costs less than $2 per foot. Anyone using it? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=284732#284732 ________________________________ Message 10 ____________________________________ Time: 04:56:12 PM PST US From: "Noel Loveys" Subject: RE: RotaxEngines-List: Re: HOSE FOR ROTAX 912 Try any Japanese car dealership or PWC outlet. Noel -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of lucien Sent: February 3, 2010 4:00 PM Subject: RotaxEngines-List: Re: HOSE FOR ROTAX 912 rampil wrote: > Hi Dick, > > You are absolutely correct, the coolant hose is 17 mm and should be > available from any hose shop. > > I bought mine locally and just had to tell the clerk that it was for a marine > inboard engine since they don't sell to aircraft! Same deal when I had > to originally buy inner tubes for the nose gear - the local tire shops will > only sell the tubes if they are for a go-kart, not an aircraft! > > Ira May I ask what shop that was and where? I havn't been able to locate 17mm heater hose anywhere in America except for Rotax dealers, so naturally I'm highly interested in where you obtained it?... Thanks, LS -------- LS Titan II SS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=284744#284744 ________________________________ Message 11 ____________________________________ Time: 07:15:58 PM PST US Subject: RotaxEngines-List: New rules affetive April 2nd From: "Roger Lee" Here are the new FAA rules. Read the bottom first. http://edocket.access.gpo.gov/2010/2010-2056.htm -------- 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=284789#284789 ________________________________ Message 12 ____________________________________ Time: 07:23:06 PM PST US Subject: RotaxEngines-List: Re: Gearbox shimming From: "Roger Lee" Hi Dick, Your friction torque test should tell you if they are weak. -------- 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=284790#284790 ------------------------------------------------------------------------------------- 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.