.7. Posted August 17, 2004 Share Posted August 17, 2004 here title changed to remove "latestnews" 7 Edited by - .7. on 17 Aug 2004 09:38:24 Link to comment Share on other sites More sharing options...
knowley Posted August 17, 2004 Share Posted August 17, 2004 Ermm... I don't know why this is titled "latest news" there is no news on the link .7. has posted to, and this post is nothing to do with me. Link to comment Share on other sites More sharing options...
frankyknuckles Posted August 17, 2004 Share Posted August 17, 2004 what (knowley, this was not me either) www.R300.net Link to comment Share on other sites More sharing options...
Jason Plato Posted August 17, 2004 Share Posted August 17, 2004 " Caterham have identified a problem with the CRB and are currently trying to source a new supplier" That looks like a step in the right direction to me Good news Link to comment Share on other sites More sharing options...
knowley Posted August 17, 2004 Share Posted August 17, 2004 Bring on members only BC - well it will stop people doing things like this! Link to comment Share on other sites More sharing options...
frankyknuckles Posted August 17, 2004 Share Posted August 17, 2004 but Dave, CC are being very inconsistent, they are refusing to fix mine after I report a fault with it but at the same time telling people there are recognised problems with the existing design. www.R300.net Link to comment Share on other sites More sharing options...
Jason Plato Posted August 17, 2004 Share Posted August 17, 2004 I sympathise with you Franky , but maybe you should speak to Caterham Midlands who on the link thread have said they are looking for a new supplier ? . My CRB went within the first year of ownership and it is a pain in the bum , but touch wood mine have been fine since - although replaced when the engine comes out each winter ...... I hope Caterham do fix this problem - clearly there is one as the comments on R300.net confirm yet again . Dave Link to comment Share on other sites More sharing options...
knowley Posted August 17, 2004 Share Posted August 17, 2004 Yes, I have the same experiance as Franky. From the article in Low Flying its not the bearing that is the problem, its the way its fitted .. i.e no Pre-Load. I have asked if the LF modification can be done to my car whilst they change the CRB - there maybe a better solution but won't say what till my fault is diagnosed. Maybe my problem is not the CRB and I have another gearbox that's eating itself alive 🙆🏻 Link to comment Share on other sites More sharing options...
Felix E Posted August 23, 2004 Share Posted August 23, 2004 Like many of us, I have now performed the remedial action as per the LF article and I have to say that one thing is immediately apparent; there is no noise difference between the clutch being in and out. Previously there was a distinct low rumble when in neutral which disappeared when the clutch pedal was depressed. I take this to mean that the pre load effect is working. Best Regards, Felix. Link to comment Share on other sites More sharing options...
V7 SLR Posted August 23, 2004 Share Posted August 23, 2004 I've now got my CRB sitting on the bench. It's done 25K miles and was working well right up to Saturday when I took it out. Clutch plate too. What do I need to check to find out what type it was, who made it, etc..?? Link to comment Share on other sites More sharing options...
timbo Posted August 23, 2004 Share Posted August 23, 2004 While completing my eng upgrade I took a look at the original CRB. Cars done 3500 miles (2004) VVC 6 spd. I was concerned, while in France, that the CRB was overflexing on oneside of the clips that hold it to the fork arm.... it almost appeared that at times it was releasing itself from the clip on one side of the fork arm... perhaps an illusion! My concerns were arisen by the clutch pedal at times springing back - hitting my foot sole as I rested my clutch foot above the clutch pedal. On removal and inspection of the CRB there was excessive play in the clutch spline bearing face of the CRB... best described as "wobbly" when rotated. Emerald Isle's 1st SV. R400 power currently under development. Link to comment Share on other sites More sharing options...
Normans_Ghost Posted August 23, 2004 Share Posted August 23, 2004 Totally unrelated to this problem as it's not a K series, but I had a noisy crb as supplied by super clutch. It had done less than 3000 mils. The new one was put in a suacepan of white grease which was heated to melting point and then allowed to set. The excess was wiped off and it's done about 10,000 miles without a squeak. norman verona 1989 BDR 220bhp Mem No 2166 the full story here Link to comment Share on other sites More sharing options...
John Vine Posted August 24, 2004 Share Posted August 24, 2004 Caterham have identified a problem with the CRB and are currently trying to source a new supplierGood news if the factory recognise that there's a problem, but not so good if they're blaming the CRB itself. IMHO, the CRB is well up to the job provided it's set up correctly with the manufacturer's recommended amount of pre-load (see LF August 2004 for more info). Perhaps they're seeking a CRB design that doesn't require a pre-load? there are recognised problems with the existing designI think that's much closer to the truth, at least as far as the current CRB is concerned. From the article in Low Flying its not the bearing that is the problem, its the way its fitted .. i.e no Pre-LoadThat's it exactly. What do I need to check to find out what type it was, who made it, etc..??If it's the standard Sierra CRB (Caterham P/N AB57), it'll have "INA F202994" inscribed on the edge of the metal bearing housing. Btw, in their comment on my LF article, CC said "We have a number of design revisions fitted to development cars currently on trial." That sounds promising, and I've suggested to Tony Pashley that maybe he could get CC to elaborate on this in a future issue. JV Edited by - John Vine on 24 Aug 2004 12:28:50 Link to comment Share on other sites More sharing options...
Paul McKenzie Posted August 24, 2004 Share Posted August 24, 2004 Nowt wrong with the CRB itself . I don't recall legions of Sierras on re-call after 3000 miles . Also, just to throw another unknown into the pot, all us VX and X flow afficionados seem to manage quite well with the same CRB...and I don't remember ever deliberately pre-loading the bearing, unless it just happens that the clutch fork configuration and clutch cable correctly adjusted achieves that anyway The K doesn't use a different set-up, does it? Paul Edited by - Paul McKenzie on 24 Aug 2004 13:00:49 Link to comment Share on other sites More sharing options...
knowley Posted August 24, 2004 Share Posted August 24, 2004 The problem appears to be more common in cars built within the last 3 years but Caterham have been using K-series engines for a lot longer than that, haven't they Link to comment Share on other sites More sharing options...
dave1968 Posted August 24, 2004 Share Posted August 24, 2004 FWIW my car is a 99 and had exactly this problem at 5000miles. I had it all replaced by Ratrace who told me that since my car was made a new design (' new cone ' ??) had been introduced which should cure the problem...... Im afraid Im a complete no hoper mechanical wise so I dont know whether this is true or not nor exactly what it means. My clutch is fine now although I still get a general 'rattle' noise when the car is idling in neutral, it dissapears when the clutch is depressed. I was hoping they had fixed the problem once and for all but reading the above posts sounds like I might get the same problem again.... Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted August 24, 2004 Leadership Team Share Posted August 24, 2004 The rattling at idle is the lay shaft in the gearbox, not related to the CRB. Rattling is worse if using a l/w flywheel, and does get progressively worse with mileage. Stu. Link to comment Share on other sites More sharing options...
caterhamnut Posted August 24, 2004 Share Posted August 24, 2004 Stu - interesting on the increased noise with L/W flywheel - something I have certainly noticed since fitting ours a few months ago - is that simply because the heavier flywheel 'damps' the vibration/noise a little? Loads of Caterham stuff here 65,000miles in 3years Link to comment Share on other sites More sharing options...
timbo Posted August 25, 2004 Share Posted August 25, 2004 If my CRB got noisy I'd never hear it given the rattle from my layshaft in the 6 speed with the R500 flywheel *eek*. Emerald Isle's 1st SV. R400 power currently under development. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted August 25, 2004 Leadership Team Share Posted August 25, 2004 Angus - the rattling is caused by small changes in the rpm of the layshaft, ie. causing the gears/shaft etc to rattle. A flywheel is there to maintain a revolving speed - more effective if heavy thereby not giving too many noticeable rattles. Reduce the mass of the flywheel and the rpm will not be quite as constant, therefore increasing the noise. I have always assumed that any increase in noise will in time relate to an increase in wear, but somebody else would need to substantiate this? You've probably noticed that a small increase in revs will reduce the rattling due to the speed variation being reduced? Stu. Link to comment Share on other sites More sharing options...
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