JimmyRocks Posted April 22, 2015 Share Posted April 22, 2015 Morning all. I'm looking for some direction with a funny noise. First of all you need to realise that I am a mechanical numpty. I love my car, but under the bonnet it's all cogs, springs and stuff like that. The guy that services it for me recons that the next step is to get engine and gearbox out! He may well be right.In recent weeks it has developed a ticking noise on acceleration, sounding a bit like pinking. I suspect that it is in the transmission somewhere. The noise is in proportion to engine speed, not road speed. If I reverse, then the noise is on deceleration not acceleration. I take it that this means that the noise is coming from transmission/clutch/gearbox. The engine is a K-series 1600, the gearbox is a five speed ?ford Sierra box. Is this a familiar problem to anyone? Any advice? Link to comment Share on other sites More sharing options...
SM25T Posted April 22, 2015 Share Posted April 22, 2015 Does it do it when you are stationary and rev the engine ? If so, check for frayed edges on alternator belt ... or cam belt ! Could also be a sticking hydraulic tappet ? Link to comment Share on other sites More sharing options...
JimmyRocks Posted April 22, 2015 Author Share Posted April 22, 2015 SM25T - no. Only when moving off or already in motion. Link to comment Share on other sites More sharing options...
Mort Posted April 22, 2015 Share Posted April 22, 2015 A bit of a long shot, but take a look at your propshaft. It may be something mechanical, but could be something as simple as something caught around it. Failing that, check for crocodiles. Link to comment Share on other sites More sharing options...
Bob L Posted April 22, 2015 Share Posted April 22, 2015 Speedo drive / cable? Try disconnecting (I have no idea how difficult that would be in reality). Link to comment Share on other sites More sharing options...
JimmyRocks Posted April 22, 2015 Author Share Posted April 22, 2015 Bob. It's an electric, not cable speedo on mine. Link to comment Share on other sites More sharing options...
SM25T Posted April 22, 2015 Share Posted April 22, 2015 If an electric speedo sender on the side of the gearbox .... it still has a wire quill to drive the sender Link to comment Share on other sites More sharing options...
John Vine Posted April 24, 2015 Share Posted April 24, 2015 You say that the ticking is proportional to engine speed rather than road speed. What happens if you dip the clutch at, say, 40mph in top? Does the ticking drop away with engine speed? Is there any difference if you do this in the intermediate gears?JV Link to comment Share on other sites More sharing options...
JimmyRocks Posted April 25, 2015 Author Share Posted April 25, 2015 John. Yes, it's proportional to engine speed, only on acceleration (deceleration in reverse) and usually at lowish revs (1-2500 rpm). No sound if I dip the clutch and also not reving the engine out of gear. Link to comment Share on other sites More sharing options...
John Vine Posted April 25, 2015 Share Posted April 25, 2015 Hmmm...tricky one. Impossible to say without actually hearing the noise, but if I had to guess, I'd go for something in the transmission between engine and gearbox internals that normally runs at crank speed -- working from front to rear, things like clutch pressure plate, driven plate (broken damper springs), diaphragm springs, release bearing, gearbox input shaft, gearbox lay shaft. Maybe the engine/gearbox will have to come out, as your mechanic suggests, to allow a thorough investigation....JV Link to comment Share on other sites More sharing options...
anthonym Posted April 26, 2015 Share Posted April 26, 2015 " If I reverse, then the noise is on deceleration not acceleration. " that sounds temptingly like a clue, because for things to be spinning in the other direction, it has to be rearwards of what? The reverse gear? So that's not the clutch cos that goes only in engine direction. Maybe the mort's crocodile post above has a point? Link to comment Share on other sites More sharing options...
JimmyRocks Posted April 27, 2015 Author Share Posted April 27, 2015 Thanks guys. That make a lot of sense, but then it can't be downstream of the gearbox or it would be in proportion to road speed, not engine speed surely?and crocodiles? Aren't they great big, green reptiles, with lots of teeth? Link to comment Share on other sites More sharing options...
Mort Posted April 27, 2015 Share Posted April 27, 2015 Think Peter Pan.http://1.bp.blogspot.com/-pmBcWv7hmOw/Tf9ynYMamjI/AAAAAAAAAGQ/UsnbmA6pI20/s400/Croc%2527s%2BClock.jpg Link to comment Share on other sites More sharing options...
anthonym Posted April 27, 2015 Share Posted April 27, 2015 I agree, but the engine doesn't change direction when you reverse. be fascinated to hear what it turns out to be. edit: think a happy thought and low fly :-) Link to comment Share on other sites More sharing options...
Arv Mc Slow Posted April 29, 2015 Share Posted April 29, 2015 Check prop shaft uj's, no tie wraps nearby doing the age old peg and card on bike spokes? Link to comment Share on other sites More sharing options...
Nillbymouth Posted April 29, 2015 Share Posted April 29, 2015 These are my thoughts: It only happens under accelleration going forward and decelleration in reverse. Under these conditions all parts between the engine and rear diff twist. The twist will be the same for accellerating forwards and decellerating backwards. It only happens < 2500 rpm. Are you sure or is it that other noises such as engine noise drowns out the ticking over this speed? Are you positive it's engine speed related rather than road speed? If it only happens under accelleration then both are increasing. Personally, I'd check all engine, gearbox and diff mounts to make sure they are secure and there is no movement. I'd then check all moving parts between the engine drive belt and the diff for a small clearance that could close as the driveline twists and moves. Maybe take the car for a drive with the tunnel top cover removed so that you can hear and see the gearbox and propshaft.Note that I'm no expert so what I say may be rubbish but worth checking if nothing else works! Link to comment Share on other sites More sharing options...
JimmyRocks Posted May 18, 2015 Author Share Posted May 18, 2015 Thanks everyone for your thoughts and suggestionsIt turns out to be my fingers disintegrating. Well, not mine, but the pressure plate fingers in the clutch.Apparently not in stock with Caterham, so shopping around for the parts. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted May 18, 2015 Member Share Posted May 18, 2015 Thanks for the update, hope you're fixed soon.Please could you add the alternative part numbers for whatever you discover: it will help the next afflicted member.JonathanPS: Isn't the design of that stamp poor? Link to comment Share on other sites More sharing options...
SM25T Posted May 18, 2015 Share Posted May 18, 2015 Speak to Redline Components Link to comment Share on other sites More sharing options...
John Vine Posted May 18, 2015 Share Posted May 18, 2015 It turns out to be my fingers disintegrating. Well, not mine, but the pressure plate fingers in the clutch.Pleased to hear you've solved the puzzzle, even if the engine does have to come out. If you haven't already found a clutch cover, I think this one from Burton is what you need (at least, the part numbers match the CC one).JV Link to comment Share on other sites More sharing options...
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