C1 1YNX Posted March 29, 2012 Share Posted March 29, 2012 Please help me before I take my Caterham out into a field & set fire to it! I have an Ital axel, it is making a speed related clonking. (bad enough that I will not drive the car). It started after I replaced the offside bearing & shaft (I would have just done the bearing but the previous owner had welded the bearing to the shaft!). I have also replaced the "A" frame bushes. The bearing & shaft on the nearside are also relatively new. It doesnt appear to be the joint on the drive shaft either. What the hell is it?!?! Answers on a postcard please!!! Link to comment Share on other sites More sharing options...
cskip Posted March 29, 2012 Share Posted March 29, 2012 Is the knocking coming from the Axle when you are cornering? You can test this when stationary by pull sharply on the roll bar. If so, it could be the bearing moving on the halfshaft. Did you shim the bearing? Did you loosen/remove the trailing arms to do the modifications? Could they be loose? Are the nuts on the end of the halfshaft done up enough? (From memory 100flbs?) Note it is always worth checking the nuts after a bit of use. I had one that became loose and resulted in a knackered halfshaft. Could the noise be coming from the drum rather than from within the axle? Link to comment Share on other sites More sharing options...
C1 1YNX Posted March 29, 2012 Author Share Posted March 29, 2012 Thanks for the reply: It knocks in a straight line from the second you pull off. I didnt shim the bearing but im convinced its not the bearing. I have jacked up the rear end & run the engine, not in gear it still spins the rear wheels slowly & the noise is there. If i stop either wheel from spinning i still get the noise so it cant be the drum or bearing on either side. The nuts are done up "FT" - as i have leant my torq wrench to a friend and have not got it back yet! I am beginning to think i have "lost a tooth" in the diff - what do you think? I have a video of it i can email you if you think it may help? Edited by - C1 1YNX on 29 Mar 2012 21:01:03 Link to comment Share on other sites More sharing options...
dalongbloke Posted March 29, 2012 Share Posted March 29, 2012 It does sound like a lost tooth I'm afraid... same happened to me last year. Test is easy: Jack rear end off the ground (on A frame) then gradually rotate the road wheel back and forth moving a little further round each time. If you have a tooth gone at some point you will feel slack ... in my case of 3 to 4 inches! You may need to rotate road wheel up to 4 times.. ie 4:1 ratio? is that how it works??!!! Good luck... Andy PS cannot recommend Redline highly enough... John sorted mine. Edited for rubbish beer induced spelling! Edited by - dalongbloke on 30 Mar 2012 10:56:54 Link to comment Share on other sites More sharing options...
C1 1YNX Posted March 29, 2012 Author Share Posted March 29, 2012 Thanks, I was afraid that might be the case! I will test it tomorrow. I have been using Redline for ages - they are fantastic. Thanks again for everyone's input, much appreciated. I'm not much good with cars But if you have any computer issues...... that's what I do! Link to comment Share on other sites More sharing options...
cskip Posted March 29, 2012 Share Posted March 29, 2012 If it is the CWP that is broken. It might be worth talking Jigsaw, I believe they still do an uprated/stronger CWP. That would be the 2nd CWP failure this week. Caterbram's went at the Intro to Sprinting day on Saturday. Let's just hope that "these things come in threes" doesn't strike me! Link to comment Share on other sites More sharing options...
James_Russell Posted March 29, 2012 Share Posted March 29, 2012 Road & Race transmissions in Kent will sell you a new one, they'll build you one with a Jigsaw CW&P if you like... Link to comment Share on other sites More sharing options...
dalongbloke Posted March 30, 2012 Share Posted March 30, 2012 I should add that Redline supplied my recon diff via R & R..... Andy Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted March 30, 2012 Share Posted March 30, 2012 It happens... I destroyed a diff on my 2CV... Link to comment Share on other sites More sharing options...
bstark Posted March 30, 2012 Share Posted March 30, 2012 This may be wishful thinking but check the handbrake cable isn't knocking anything near the wheel. Mine started doing this and it was loud enough for me to worry about something more serious. Link to comment Share on other sites More sharing options...
virden Posted March 30, 2012 Share Posted March 30, 2012 "It happens... I destroyed a diff on my 2CV... " How?!!!! Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted March 30, 2012 Share Posted March 30, 2012 Apparently, a 2CV diff will not withstand much wheel spinning abuse *redface* This is the pinion: http://a1.sphotos.ak.fbcdn.net/hphotos-ak-ash4/123_506299661192_193104608_33605003_4683_n.jpg The crown wheel was equally chewed, and half the teeth seemed to reside in the bottom of the gearbox. But then, a second hand gearbox is only £100 I broke that too Link to comment Share on other sites More sharing options...
elie boone Posted March 30, 2012 Share Posted March 30, 2012 MOCA 2CV, a BM boxer with GS g.box is what you need !! Link to comment Share on other sites More sharing options...
CaterBram Posted March 31, 2012 Share Posted March 31, 2012 Yup mine died last weekend, on stripping down there was one tooth missing which looked like it decided it did not like being left alone and got jammed between the Crown and Pinion. Luckily i've got a spare diff unit which i'm checking the shimming on this weekend before refitting. Edited by - CaterBram Jnr on 31 Mar 2012 07:10:21 Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted March 31, 2012 Share Posted March 31, 2012 Elie, BM boxers are tooooooo heavy. Doesn't help turn in with the engine hanging over the front Loads of power though GS gear box, 5 speed and hens teeth ☹️ Link to comment Share on other sites More sharing options...
CaterBram Posted April 1, 2012 Share Posted April 1, 2012 Diff rebuilt, 4 to 6 thou clearance, fitted & a nice run out to rebed in. Well happy. 😬 Hope "C1 1YNX" get's repaired as easilly. Link to comment Share on other sites More sharing options...
C1 1YNX Posted April 1, 2012 Author Share Posted April 1, 2012 Ok, just stripped the back end of mine & got the diff out. You will have to forgive my technical ignorance, I know how to take things apart but I dont know what most bits are called! The part of the diff that feeds through the pinion bearing & turns the crown wheel (think it may well be the pinion)has shed 3 teeth - hence the clonking! Just need to replace that bit! Any ideas whether I can get it by itself? Link to comment Share on other sites More sharing options...
CaterBram Posted April 1, 2012 Share Posted April 1, 2012 It's not as straight forward as just swaping the pinion as you need to make sure there is no damage to the crown gear and the reshim to the correct clearances. I was lucky as I already had a spare diff which I just needed to swap the LSD into and reset the clearances. I know that there has been a few suggestions through around already with Road&Race transmission and MacMillan motor sport. both for spares or for rebuilding and reset the one you have already. Link to comment Share on other sites More sharing options...
elie boone Posted April 1, 2012 Share Posted April 1, 2012 The CWP is a set, it's not the best idea to change a single part. Link to comment Share on other sites More sharing options...
C1 1YNX Posted April 1, 2012 Author Share Posted April 1, 2012 I was hoping to get away with it! I also have a 26 year old Landrover where the tolerances are slightly more tolerant!!!! Will do some phoning about tomorrow! Many thanks for all your input, it's very much appreciated. Link to comment Share on other sites More sharing options...
CaterBram Posted April 1, 2012 Share Posted April 1, 2012 This is what mine looked like when I stripped it down http://a4.sphotos.ak.fbcdn.net/hphotos-ak-ash3/530153_10150675387548881_132412333880_9526171_764738262_n.jpg Is your's an open or limited slip ? Looking on the Jugsaw site they are looking at prices from £235 for a recon, which I assume is a standard open diff, deffinatly worth taking advice and talking to them, road & race or Macmillan. Edited by - CaterBram Jnr on 1 Apr 2012 18:03:53 Link to comment Share on other sites More sharing options...
C1 1YNX Posted April 1, 2012 Author Share Posted April 1, 2012 Looks worse than mine! I guess yours stopped driving? Mine still moved all be it very noisily! I was hoping not to replace the entire diff - seems a little extreme seeing as only a small piece is broken! Will find out tomorrow. Link to comment Share on other sites More sharing options...
CaterBram Posted April 1, 2012 Share Posted April 1, 2012 Nasty Cluncking over the line at 6000RPM and no drive. stripped one tooth off the crown and about 1/2" off the inside of every tooth on the crown. had to spoon the bit's out of the inside of the axle before giving it a good clean. http://a8.sphotos.ak.fbcdn.net/hphotos-ak-ash3/557126_10150676077108881_132412333880_9529040_525819916_n.jpg There's a good video on youtube on how to setup a rear diff which you will find interesting Took her out for the first time today, trying to remember what she sounded like before to decide if she was noisier or quiter than before. Edited by - CaterBram Jnr on 1 Apr 2012 19:56:47 Edited by - CaterBram Jnr on 1 Apr 2012 19:57:17 Link to comment Share on other sites More sharing options...
simon metcalfe Posted April 1, 2012 Share Posted April 1, 2012 Hi, just a thought but I had a similar mystery clonking on my live axle car years ago - it actually turned out to be a collapsed / failed gearbox mount - it's unfortunately very fiddly to access but can be replaced without removing the engine and gearbox. Undo the bolt (there's a round hole in the floor) and carefully jack up the gearbox to check it. Basically if it's gone it allows lateral movement which causes the clonking. Link to comment Share on other sites More sharing options...
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