Help me diagnose this engine trouble
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From: Tiago on 8 Feb 2010 06:34 On Feb 8, 8:31 am, Tiago <diariodastril...(a)gmail.com> wrote: > how do you spell sludge? http://www.postimage.org/image.php?v=aVDUUQi
From: XR650L_Dave on 8 Feb 2010 09:01 On Feb 8, 6:31 am, Tiago <diariodastril...(a)gmail.com> wrote: > On Feb 5, 1:12 pm, HardWorkingDog <har...(a)mush.man> wrote: > > > In article > > <77f6133c-cc8f-4a3d-bcc4-f37e0b8a8...(a)a5g2000yqi.googlegroups.com>, > > > Tiago <diariodastril...(a)gmail.com> wrote: > > > Today is the > > > surgery, scheduled for 1800 gmt-3. report to follow! > > > boa sorte, doctor > > > -- > > Charles > > '99 YZ250 > > :( > > bad news, ops, make that terrible news. > > and good news. > > let me start with the good ones. > > one bent shift fork and three gears worn out. > > forks:http://www.postimage.org/image.php?v=gxbYF7i > > how do you spell sludge?http://www.postimage.org/image.php?v=gxbYMBJhttp://www.postimage.org/image.php?v=PqTo8_A > > this last picture has a big bearing, the crank bearing... > > it was hard to clean it all, but all done!http://www.postimage.org/image.php?v=gxbYU59 > > workbench with the much needed toolshttp://www.postimage.org/image.php?v=PqTodZS > > the bad news: > the crank bearing I mention is slipping the inner race in the crank. > a new crank is over half what the bike worth. this bike is not a > keeper, as is my own XR250. > > What we plan: red loctite over the bearing/crank connection. What do > you think? Will it hold? > > -- T If red loctite is the strongest available, I'd say yes. There is a 'sleeve retainer' grade, too. If you have a friend at a machine shop there are various potions they might be able to recommend. One thing that is sometimes done when it slips in the case half is to pepper the surface with a centerpunch to raise the surface, then re- machine. Not sure if the same can be done on the crank, and it's probably be over-kill for this bike. A true fix would be to have a machine shop turn the crank undersize, put on a tight press-fit (interference fit) sleeve, then turn down the sleeve to the originally required dimension. Again, overkill. Dave
From: sturd on 8 Feb 2010 09:27 XR650L_Dave suggests: > One thing that is sometimes done when it slips in the case half is to > pepper the surface with a centerpunch to raise the surface, then re- > machine. Not sure if the same can be done on the crank, and it's > probably be over-kill for this bike. That typically won't be true to the center. However, if you can get a machine shop to knurl the surface of the crank where it touches the bearing, they should be able to get that true. It can raise the surface of the crank a bit. The red loctite may work but air cooled motors can get hot enough to break down that stuff. I think. Go fast. Take chances. Mike S.
From: Tiago on 8 Feb 2010 09:28 On Feb 8, 11:01 am, XR650L_Dave <spamTHIS...(a)yahoo.com> wrote: > > If red loctite is the strongest available, I'd say yes. There is a > 'sleeve retainer' grade, too. > > If you have a friend at a machine shop there are various potions they > might be able to recommend. The bike owner brought the parts to a machine shop and just called me with the results. The best machine shop, that deals with motorcycles, in town. No way, they said. it really needs new crank, bearings, conn. rod... That plus what was spent lately in suspension and top end and gears and shift forks come close to what the bike worth. Owner is in a very bad position... Bike is paid for, but is becoming unreliable. He dumped a lot of cash on it, hoping bike would hold itself together for at least a couple years. Too bad, too bad... :( > One thing that is sometimes done when it slips in the case half is to > pepper the surface with a centerpunch to raise the surface, then re- > machine. Not sure if the same can be done on the crank, and it's > probably be over-kill for this bike. Perhaps we could mggyver something like this? I thought about that, but I don't think I have tools hard enough to raise the surface either on the bearing or the crank. > > A true fix would be to have a machine shop turn the crank undersize, > put on a tight press-fit (interference fit) sleeve, then turn down the > sleeve to the originally required dimension. Again, overkill. uh, yes, plus, that would be a ticking bomb... the best option is part it out (or sell to an unsuspecting soul, may us all rot in hell for that) and apply for a financing... -- T
From: HardWorkingDog on 8 Feb 2010 10:39
In article <701d12aa-9b36-42b1-bac5-268460858b82(a)3g2000yqn.googlegroups.com>, XR650L_Dave <spamTHISbrp(a)yahoo.com> wrote: > > What we plan: red loctite over the bearing/crank connection. What do > > you think? Will it hold? > > > > -- T > > If red loctite is the strongest available, I'd say yes. There is a > 'sleeve retainer' grade, too. I second that. Search on loctite.com (they have a Brazil site) for keyword "Retaining Compound" or whatever the equivalent is in Portuguese. #609, 620, 638, 680 as a few to start. Made to hold bearings. Will withstand temps. up to 250�C. -- Charles '99 YZ250 |