---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Thu 08/12/10: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:26 AM - Carb and gearbox rebuilds (Roger Lee) 2. 06:00 PM - Re: Re: Engine roughness (Hugh McKay) 3. 09:31 PM - Rotax 912ULS gearbox tear down (Roger Lee) ________________________________ Message 1 _____________________________________ Time: 06:26:59 AM PST US Subject: RotaxEngines-List: Carb and gearbox rebuilds From: "Roger Lee" Hi All, If any one wants to have their carbs rebuilt I will do them for $50 plus parts and If you need your gearbox rebuilt or shimmed I can do those, too. Carbs are a one day turn around. Give me a call or an email if I can be of assistance. If you have a 1990-1999 year Rotax 912 engine or a high time engine (800 plus hrs.) then I would recommend the carbs being done. -------- 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=308491#308491 ________________________________ Message 2 _____________________________________ Time: 06:00:00 PM PST US From: "Hugh McKay" Subject: Re: RotaxEngines-List: Re: Engine roughness Roger,etal Well, in the course of balancing my carbs a friend of mine ask me to check to make sure nothing was coming in contact with the pick-ups for the ignition circuits. All were fine except one. On my Allegro one of the cooling pipes drops down vertically near the back of the engine. This aluminum pipe was barely touching the pick-up for what I believe to be ignition circuit B. On page 121 in the Lockwood Aviation Supply Catalogue the pick-up I am referring to is the one shown as number 3. I assume the wiring diagram as shown is as if you are looking at the back of the engine. I corrected the position of the aluminum pipe so it cleared the pick-up an finished balancing the carbs. I noticed one of the small wires on the pick-up looked like it had the insulation worn off in one spot. I took a small amount of silicone and covered the spot. After finishing everything I decided to test fly the plane. During the normal starting procedure everything went fine and I taxied to the hold point. At the hold point I was going through the normal checks, one of which is an ignition check (i.e. I ran the engine up to 4000 rpm and killed one switch. The rpm drop was normal. When I killed the other switch the engine immediately shut off. I quickly opened the switch and the engine caught an ran fine. This alarmed me so I backed the engine down, revved it back up to 4000 rpm and the same thin happened. I began to taxi back to the hanger, but decided to try the circuit again. This time everything was normal. I did this three or four times and everything was normal so I decided to fly. I flew around the "patch" for about 30 minutes with no problem, so came back an landed. I decided to fly one more pattern, but I though I would check the ignition circuits again. This time when I "killed" the first circuit all was fine. But when I "killed" the second one it failed again and shut the engine down. This time I took it to the hanger. Help!!!!!! Hugh McKay Allegro 2000 ELSA Rotax 912 UL -------------------------------------------------- From: "Roger Lee" Sent: Tuesday, August 10, 2010 4:54 PM Subject: RotaxEngines-List: Re: Engine roughness > > Hi Hugh, > > Those mixture screws should be set before a pneumatic balance. Since you > now have those set you absolutely need to do a pneumatic balance. Leave > the screws at 1.5 turns out. The roughness is because they are helping > with the mixture at the low rpms. As you go above 3500 rpm to 4000+rpm > that circuit now longer is in play. After the pneumatic balance I would > bet your engine will be smooth. > > -------- > 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=308271#308271 > > > ________________________________ Message 3 _____________________________________ Time: 09:31:21 PM PST US Subject: RotaxEngines-List: Rotax 912ULS gearbox tear down From: "Roger Lee" Hi All, Here are some pictures from a Rotax 912 gearbox. This is being torn down and examined from a prop strike on an RV-12. You will see a gearbox clutch in one of the pictures and they are installed in the 912ULS 100 hp, but not the 912UL 80 hp. Everything has to come out including the oil seal and bearing. A dye penetrant test now needs to be done down by the bearing opening. The shaft was checked for run out tolerances on the flange and crankcase shaft. These happen to be okay on this plane, this time. that isn't always the case. If you are going to have a prop strike do it at idle or engine off. High speed strikes don't do the prop shaft any favors. I thought some of you may enjoy looking at the inside of a gearbox. -------- 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=308616#308616 Attachments: http://forums.matronics.com//files/binder3_154.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.