Only friday I was not real happy with ours and wondering what to do so best contact cliff to find more. I find a little movement between frame and side of glider - do others have this problem? I do know last week while I was away Tom gilbert was working on a dimona mainly head/overvolt problems. Ian M
2008/8/2 Rob Thompson <[EMAIL PROTECTED]> > Hello all, > We have had one of the Dimona's front canopy locating pins break off a > short distance up inside the glass it is embedded in. > I haven't seen it personally but Colin Brock and Cliff Wylie at Camden > repaired it if you need more information. > Keep an eye on this.....perhaps this should be promulgated as a as an > Airworthiness bulletin. > I'll talk to Cliff and get some more details. > Rob > > > > > > > > > > > > > > > > > > > > > > > > > > ............................................. > > ----- Original Message ---- > From: John <[EMAIL PROTECTED]> > To: [email protected] > Cc: Sean Jorgensen-Day <[EMAIL PROTECTED]>; Sean > Jorgensen <[EMAIL PROTECTED]>; Russell White < > [EMAIL PROTECTED]>; Rob Hanbury <[EMAIL PROTECTED]>; Redmond > Quinn <[EMAIL PROTECTED]>; Michael Shirley < > [EMAIL PROTECTED]>; Kevin Lewis <[EMAIL PROTECTED]>; Keith > Gateley <[EMAIL PROTECTED]>; John Hudson <[EMAIL PROTECTED]>; Harry > Bache <[EMAIL PROTECTED]>; graham marsh <[EMAIL PROTECTED]>; Gavin > Wrigley <[EMAIL PROTECTED]>; Damien O'Reilly <[EMAIL PROTECTED]>; > Colin Turner <[EMAIL PROTECTED]>; Catherine Conway < > [EMAIL PROTECTED]>; Baylee Roberts <[EMAIL PROTECTED]> > Sent: Thursday, 10 July, 2008 11:36:05 AM > Subject: Re: [DOG mailing list] RE: Fw: GUD > > *The zenith carburettor can only work properly if the float level is > correct. The setting is 16.5mm and I have made a very simple tool for > getting this right. Anybody who wants a drawing of this just email me. If > you decide to buy a tool for adjusting the main jet be aware that there are > two types, slot or hex. plus some early types that have the adjustment on > the bottom of the fuel bowl. The main jet tool helps prevent damage to the > diaphram.* > ** > *The correct needle for L2000 EB and L2400 EB is B5CK and the float > chamber needle and seat is 1.75. Make sure the needle and seat is brass not > nylon as is usually supplied by automotive stores.* > ** > *The mixture adjustment is to compensate for slight variations in floats > and the way the needle mounts in the piston. This adjustment basically only > affects the idle mixture. If the carburettor is set up correctly a lean > mixture can be caused by leaks around a worn throttle spindle or other air > leaks. Rich mixture indicates a damaged diaphram. The oil in the dashpot is > to help richen the mixture on acceleration and should be weight 68 not > engine oil which is viscosity modified. I suppose engine oil is better than > no oil. You can test the mixture by raising and lowering the dashpot piston > while on idle - with care.* > ** > *See Limbach MI 10.3 for further information.* > ** > *Please note my change of email address - [EMAIL PROTECTED] > ** > *Regards, John.* > > > ----- Original Message ----- > *From:* Rob Thompson <[EMAIL PROTECTED]> > *To:* [email protected] > *Sent:* Thursday, July 10, 2008 7:44 AM > *Subject:* Re: [DOG mailing list] RE: Fw: GUD > > When the mixture is right I often find that the zenith carbs seem to be set > nearly at the rich end of the adjustment range. I am wondering if maybe > these carbs don't have the right needles and jets. > Rob > > > > > > > > > > > > > > > > > > > > > > > > > > > ............................................. > > ----- Original Message ---- > From: Nigel Baker <[EMAIL PROTECTED]> > To: [email protected] > Sent: Wednesday, 9 July, 2008 2:30:56 PM > Subject: Re: [DOG mailing list] RE: Fw: GUD > > They tell me it is as rich as the needles will go which makes me > suspicious. I will get the Carbs and check myself as I think I know what is > wrong. When it was overhauled the needles were set as per the book but hey > have been playing with it since. > Cheers. > Nige. > > > ----- Original Message ----- > *From:* Rob Thompson <[EMAIL PROTECTED]> > *To:* [email protected] > *Sent:* Wednesday, July 09, 2008 1:51 PM > *Subject:* Re: [DOG mailing list] RE: Fw: GUD > > The twin SU carbies are generally zenith brand ...the mixture adjusting > tool can be purchased from many of the VW enthusiasts shops for about $25. > To do the initial set up on the carbs refer to the Limbach manual. After > that I find the best way to fine tune mixture is to go by the spark plug > colour - when you adjust the carbs make the same adjustment to each one. > > The valve seats in Nigel's photos are pretty tragic...the compression and > performance must have been noticably on the decline for a > while.......running too lean will burn valves and seats (mixture still > burning as it leaves the chamber). Also the standard VW seats and valves are > prone to corrosion...Nigel tells me the new Limbach alloy valves are > anecdotally good. Running stellite seats with standard valves also is much > better than standard seats. Don't be tempted to use hard valves with hard > stellite seats however as the combination has been reported to fail in some > VW motors. > Rob > > > PO Box 129, > Lawson, NSW, 2783. > phone 02 47592307 > mobile 0429 493828 > > > > > > > > > > > > > > > > > > > > > > > > > > ............................................. > > ----- Original Message ---- > From: Sean Jorgensen-Day <[EMAIL PROTECTED]> > To: Nigel Baker <[EMAIL PROTECTED]>; DOGS <[email protected]> > Sent: Wednesday, 9 July, 2008 10:42:35 AM > Subject: [DOG mailing list] RE: Fw: GUD > > > Nige, > What options are there to get the thing running richer? > > Sean > > -----Original Message----- > From: Nigel Baker [mailto:[EMAIL PROTECTED] > Sent: Wednesday, 9 July 2008 10:03 AM > To: DOGS > Cc: Sean Jorgensen-Day; Sean Jorgensen; Russell White; Rob Hanbury; > Redmond Quinn; Michael Shirley; Kevin Lewis; Keith Gateley; John Hudson; > Harry Bache; graham marsh; Gavin Wrigley; Damien O'Reilly; Colin Turner; > Catherine Conway; Baylee Roberts > Subject: Fw: Fw: GUD > > G'day Dogs and others. > I have added other Limbach users to this mail for their interest. > The attached images are from a L2000 as fitted to the Grob109 which is > essentially the same base engine as used in the Dimona. > The aircraft had some suspicious damage to the Prop which required a > Bulk Strip. > The Crank was cracked and a new shortblock engine has been ordered. > When we stripped the engine I did not like the look of the Valve seats > so sent these images to the factory for comment which is below. > Also one valve was noted to be "sticking" when turning the engine over > during disassembly. > > Whenever Peter says something needs to be "controlled" he means > "Checked". > I rang to clarify a few points. > By "Valve Play" he is referring to Tappet Clearance not Valve Stem > clearance. > By poor carburetion he means "Poor as apposed to Rich" thus he means > "Lean Mixture". > He has suggested that the corrosion has come from the use of Avgas. > He stated that in Europe they normally have trouble with corrosion on > engines using Avgas and seldom found on engines running on Unleaded. > In the past Peter has said they prefer the engine be run on Unleaded > instead of Avgas. > Avgas 100LL of course is still acceptable. > This is of course 98oct unleaded so Premium Unleaded. This must be the > 98oct variety and not the 95oct. > I use BP Ultimate. > Of course I have a problem looming. The eastern states are now > requiring 10% Alcohol content in car fuel and expect that will spread > through all states. I understand the US is in the same position and much > of Europe. > The Limbach Engine is rated for 5% Alcohol and the last time I discussed > this with Peter (a while ago now) he said they would be changing it to > 10% or higher. Brazil's fuel spec for instance is much higher being over > 20%. > > While my fuel hoses are rated for Alcohol I still have the FRP fuel tank > which I believe is not. So changing to the Alloy tank is pending for me. > > That leaves the Fuel Cock and Electric Fuel Pump left in the circuit to > worry about. The seals I put in the Fuel Cock are OK with Alcohol but > will have to check up on the Pump. > Something for you all to ponder if running unleaded like myself. > > Below is the correspondence as mentioned. > Cheers. > Nige. > > > > ----- Original Message ----- > From: "Peter Salomon" <[EMAIL PROTECTED]> > To: "Nigel Baker" <[EMAIL PROTECTED]> > Sent: Friday, July 04, 2008 7:30 PM > Subject: Re: Fw: GUD > > > > Nigel Baker schrieb: > >> G'Day Peter. > >> Attached photo's of the Cylinder heads off the engine that had the > Shock > >> Load. > >> Can you give me an opinion on the corosion to the Valve Seats. > >> This aircraft was being flown every month but the Airfeild is near > the > >> Ocean. The climate here though is not humid. > >> There is also a grey/white powder over the surfaces of the intake > ports > >> and cobustion chamber. > >> Any ideas of why it is this bad. It is 48 hours since overhaul. > >> Regs. > >> Nigel. > >> > > > Hi Nigel, > > > > blimey, what type of fuel fly your client? > > After your pictures can I find some problems with the heads. > > 1.) I think the left head on your picture is from the right engine > site. > > I can see that the exhaust valve from cylinder no 2 have burn tracks. > > No valve play! > > Slight leaky between cylinder and head. > > Overheating failing could be poor carburation! > > The corrosion on the seats could come from using AVGAS! > > The beading in the ports show me very high exhaust temperature! > > On cylinder one the intake valve have also burn tracks outside. > > Please control this valve. No valve play could be the reason. > > > > A new (complete) engine will help. ;-) > > > > Best regards and nice weekend. > > > > Peter > > > > > > --------------------------------------------------------------------- > You are subscribed to the Dimona Owners Group mailing list. > To unsubscribe, send email to: [EMAIL PROTECTED] > > > ------------------------------ > Start at the new Yahoo!7 for a better online experience - Start > Here<http://au.rd.yahoo.com/mail/taglines/au/y7mail/default/*http://au.docs.yahoo.com/somethingwonderful/index.php?p1=brand&p2=other&p3=au&p4=tagline> > . > > > ------------------------------ > Start at the new Yahoo!7 for a better online experience - Start > Here<http://au.rd.yahoo.com/mail/taglines/au/y7mail/default/*http://au.docs.yahoo.com/somethingwonderful/index.php?p1=brand&p2=other&p3=au&p4=tagline> > . > > > ------------------------------ > Find a better answer, faster with the new Yahoo!7 Search - Start > Here<http://au.rd.yahoo.com/mail/taglines/au/y7mail/default/search/*http://au.search.yahoo.com/search?p=pete+murray&fr=au_ssw&p1=search&p2=other&p3=au&p4=tagline> > . >
