---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Sat 03/17/07: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:49 AM - Re: Jab Service Bulletin JSB 012-1 Fly wheel bolts (Terminator) 2. 09:43 AM - Re: Jab Service Bulletin JSB 012-1 Fly wheel bolts (rickpitcher) 3. 02:58 PM - Re: Jab Service Bulletin JSB 012-1 Fly wheel bolts (jetboy) ________________________________ Message 1 _____________________________________ Time: 02:49:02 AM PST US Subject: JabiruEngine-List: Re: Jab Service Bulletin JSB 012-1 Fly wheel bolts From: "Terminator" Hi Chuck, I have flown a short time in a Jab 400 with a total time of 250hrs, here in South Africa, with a good friend of mine. Three weeks ago we were in the air at 2000ft ASL and fortunatly 5 miles from an arifield, when we heard a lowd screech from the motor. The noise stopped but we decided to land and inspect and gues what we saw ?! Two sheared bolts! I believe a Jab 80hp 2 seater had all 6 bolts sheer in Cape Town and now the preflight procedure is to hold the fly wheel and turn the prop. You will have noticed that washers have been placed on the bolts. This is simply because the AMO was unable to tighten the bolts as they appeared to be too long, although they are stock standard. I will send this thread to the AMO, as you may have a good tip in your post. Mark Read this topic online here: http://forums.matronics.com/viewtopic.php?p=101185#101185 Attachments: http://forums.matronics.com//files/img_0028_766.jpg ________________________________ Message 2 _____________________________________ Time: 09:43:52 AM PST US Subject: JabiruEngine-List: Re: Jab Service Bulletin JSB 012-1 Fly wheel bolts From: "rickpitcher" Terminator wrote: > Hi Chuck, I have flown a short time in a Jab 400 with a total time of 250hrs, here in South Africa, with a good friend of mine. Three weeks ago we were in the air at 2000ft ASL and fortunatly 5 miles from an arifield, when we heard a lowd screech from the motor. > > The noise stopped but we decided to land and inspect and gues what we saw ?! > > Two sheared bolts! > > I believe a Jab 80hp 2 seater had all 6 bolts sheer in Cape Town and now the preflight procedure is to hold the fly wheel and turn the prop. > > You will have noticed that washers have been placed on the bolts. This is simply because the AMO was unable to tighten the bolts as they appeared to be too long, although they are stock standard. > > I will send this thread to the AMO, as you may have a good tip in your post. > > Mark Looking at the photo, I have a couple of questions/comments?: 1) I see that the 2 bolts are NOT sheared, but appear to have backed out. The 2 are opposite each other as if the mecahanic was torquing in the standard "star pattern" where we torque opposite sides progressively to equally spread the tension, and the 2 opposite bolts were inadvertantly missed? 2) The pic shows some red stuff on the washer that your AME added. Is that loctite? Curious because the loctite 620 that is called for in the service bulletin is green, not red. 3) I don't see any evidence of loctite in the threads that are showing, my bolts had a residue of loctite along the shank that had to be cleaned off before replacing the bolts with a fresh coat of Loctite 620. 4) The washers under the heads bother seem odd. The new bolts were not the same length as the originals? Curious. Rick Pitcher Jabiru 3300 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=101231#101231 ________________________________ Message 3 _____________________________________ Time: 02:58:46 PM PST US Subject: JabiruEngine-List: Re: Jab Service Bulletin JSB 012-1 Fly wheel bolts From: "jetboy" Hi, Re the failed bolts it would be hepful to know if the SB had been done or if they are original bolts at 250 hrs, and originally installed at the low torque, for which the SB was issued to correct? >From the photo I cannot tell if the bolts have sheared but this is likely as they will shear at the crankshaft flange which is 1" in from the head. Mention is made about washers. Standard fitting includes six belleville washers. When I carried out the SB I hand threaded new bolts all the way without washers to test for possible bottoming, and had no problems. As for the colour of threadlock, only the SB and new engines use green 620, earlier assembly would be red I expect - in my engine the old threadlock did not have much colour and was only evident around the thread ends. Seems like doing the SB or more will be less troublesome than replacing the alternator. Regards, Ralph -------- Ralph - CH701 / 2200a Read this topic online here: http://forums.matronics.com/viewtopic.php?p=101272#101272 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message jabiruengine-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/JabiruEngine-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/jabiruengine-list Browse Digests http://www.matronics.com/digest/jabiruengine-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.