Scott Tully Posted September 11, 2002 Share Posted September 11, 2002 i have just bought my first Cat and whem I go over bumps the rear suspention sometimes bangs like it is loose. is this normal? Link to comment Share on other sites More sharing options...
Mark H Posted September 11, 2002 Share Posted September 11, 2002 Did you buy it private or from a dealer 🤔 And have you had a look round underneth 🤔 Still can,t see Nifty in my mirrors ! Link to comment Share on other sites More sharing options...
Red SLR Posted September 11, 2002 Share Posted September 11, 2002 How old is the car? Is anything loose? Could be quite a few things, check everything is tight first. Also check the diff has had the "lump" cut off it. Simon. X777CAT Link to comment Share on other sites More sharing options...
Scott Tully Posted September 11, 2002 Author Share Posted September 11, 2002 the car is brand new and was built by caterham, it sounds like you have just hit the axle with a hammer when it makes the noise. Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted September 11, 2002 Area Representative Share Posted September 11, 2002 Does it make the noise when the suspension is being compressed, or when it droops? My, new this year, Roadsport sometimes knocks as the rear suspension extends to full droop and the dampers "top out". Link to comment Share on other sites More sharing options...
scooby dooby doo Posted September 11, 2002 Share Posted September 11, 2002 I'll explain this a bit long windedly as it sounds like you've only just got the car and havn't experienced them much. pd congrats on making a great purchase First thing - Caterham clunk more than normals cars do as there no sound deadening material etc. Assuming it *is* a problem... Is everything is tightened up sufficiently - give the wheels a tug and see if anything feels like its moving. it will a bit as the tyre will flex. but does it feel more mechanical than that 🤔 next then - has the diff lug been removed (it wasn't when i got my s/h car ) is it a dedion or a live axle 🤔 if its a dedion (the rear axle will be a solid bar - a live axle has a BIG bulge in the middle about 10" across) then have a look under the car for the differetial - its the shiny casing about 10" accross and 8" in height in the middle of the car at the back. It should be pretty much flat at the back. Youave to cut a lump of ali about 5 cm long off it to achieve this. If its not cut off it will stick out into the way of the dedion tube as it goes upwards to full travel. mine was like this for a good few years until i realised 😳 other thoughtrs - something catching something else - have a look around - is there any worn metal visible where something might be touching 🤔 HOOPY R706KGU CYCLE WINGS AEROSCREEN K SERIES CUCUMBER Link to comment Share on other sites More sharing options...
alicat Posted September 13, 2002 Share Posted September 13, 2002 Daft question!!!! Nothing rolling round in the car? Jack in the back? Link to comment Share on other sites More sharing options...
Scott Tully Posted September 14, 2002 Author Share Posted September 14, 2002 Don't think its the Jack as I have moved it. It only happens when I go over a large bump or pot hole, it seem to be coming from the middle of the car. Ive checked everything and it all seems tight. Where do I look to find the "Lump"? It is hard to see crawling under a seven. Azure Blue SV 1800 K Series GK52OUO. Link to comment Share on other sites More sharing options...
scooby dooby doo Posted September 14, 2002 Share Posted September 14, 2002 easiest way may be to take one wheel off and look from the side. There should be nothing between the dedion tube and the boot floor (a few pipes maybe). The lump sticks out quite obviously if its there. it may be that my car was the only one ever built where the first instruction in the manual (ie cut the lump off) was omitted. But it wasn't spotted for a long time by several garages so... HOOPY R706KGU CYCLE WINGS AEROSCREEN K SERIES CUCUMBER Link to comment Share on other sites More sharing options...
scooby dooby doo Posted September 14, 2002 Share Posted September 14, 2002 this may help here (1) is the dedion tube, and the diff is just under the (5) ehile i'm here... (2) are the dedion ears (3) are the halfshafts or driveshafts. hmmm.. technically the former i think. anybody 🤔 (4) are the radius arms (5) is the aframe (not all of it is highlighted) the page that the pic is on has some good pictures but much of the text is inaccurate to say the least. I've not updated my website for some time ❗ HOOPY R706KGU CYCLE WINGS AEROSCREEN K SERIES CUCUMBER Edited by - hoopy on 14 Sep 2002 09:23:33 Link to comment Share on other sites More sharing options...
Scott Tully Posted September 14, 2002 Author Share Posted September 14, 2002 Thanks Hoopy, I'll take of the wheel and check. Can you help on this one, i was looking underneath the back earlier and noticed oil on the bottom of the fuel tank. It had run down from a pipe at the top of the fuel tank, it looked like a breather from the engine but am unsure anyway it was definatly oil and had come from this pipe. The pipe was rubber and had a tiewrap on it to hold it in place on the tank, any suggesions what it could be. Azure Blue SV 1800 K Series GK52OUO. Link to comment Share on other sites More sharing options...
Fred Posted September 14, 2002 Share Posted September 14, 2002 scott it is a breather what you think is oil .is petrol and **** of the ground clean it up with a rag and wd 40 or what ever you want to use you also have a pipe on the top of the diff that can spurt out oil on heavy corners or track this is also a breather Edited by - fred on 14 Sep 2002 20:56:28 Link to comment Share on other sites More sharing options...
Scott Tully Posted September 14, 2002 Author Share Posted September 14, 2002 thanks, sorry to ask stupid questions, but i only got my 1st 7 two weeks ago and the manuals are'nt exactly comprehensive. Azure Blue SV 1800 K Series GK52OUO. Link to comment Share on other sites More sharing options...
Fred Posted September 14, 2002 Share Posted September 14, 2002 im on my second and still need the help from members .thats the hole point of this site. 😬 good luck fred Link to comment Share on other sites More sharing options...
scooby dooby doo Posted September 15, 2002 Share Posted September 15, 2002 it could be petrol with a load of road muck stuck to it from the tank breather. or equally it could be oil from the diff breather. I wouldn't worry about either. Clean it off and have a quick look next time - unless its pouring out your fine. HOOPY R706KGU CYCLE WINGS AEROSCREEN K SERIES CUCUMBER Link to comment Share on other sites More sharing options...
Rob Walker Posted September 15, 2002 Share Posted September 15, 2002 Too much preload on the rear springs, this allows the dampers to top out when the suspension becomes unloaded. Remedy wind the spring seats down a tad or fit shorter springs. Edited by - Rob walker on 15 Sep 2002 09:27:33 Link to comment Share on other sites More sharing options...
Support Team rob spencer Posted September 16, 2002 Support Team Share Posted September 16, 2002 Have you got an underslung rear anti-roll bar? If you have, it runs very close to the underside of the diff even when the diff casing has been filed down. i had a banging noise over bumps and it was cured by a 50mm piece of heater hose wrapped around the arb and secured with tie-wraps Link to comment Share on other sites More sharing options...
Scott Tully Posted September 16, 2002 Author Share Posted September 16, 2002 Rob, As you live in chesterfield have you taken your seven to John Noble motorsport for anything? I am taking mine on saturday for its 500 mile service, and wondered if they are any good. Azure Blue SV 1800 K Series GK52OUO. Link to comment Share on other sites More sharing options...
Support Team rob spencer Posted September 17, 2002 Support Team Share Posted September 17, 2002 Scott I took the car down to John Noble's for its post-build check over but I haven*t needed to have anything done to it yet so I can*t comment first hand on how good he is. He has been in the game for at least twenty years to my certain knowledge and still works in the business himself (he made a point of introducing himself to me when I was down there). I*ve never heard any negative comment. Has anyone else used him for any work other than post-buid checks (I seem to remember Julian Thompson describing his trip over the pennines)? Link to comment Share on other sites More sharing options...
Support Team rob spencer Posted September 17, 2002 Support Team Share Posted September 17, 2002 Scott You will pass within 1/4 mile of my place on your way to John Noble*s. You are welcome to call in and kick a tyre or two. E mail me and I*ll send you directions. Rob Link to comment Share on other sites More sharing options...
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