Wingnonut Posted October 18, 2005 Share Posted October 18, 2005 When I was fiddling around with my sarter motor over the summer (trying to get the bloody thing to work reliably ) I once fitted it and it made a screaching noise when it started the engine . Removing it and refitting made it go away. Now I've bought and fitted a new SM it's doing it again and I can't seem to stop it from doing it by refitting. It starts the car no problem (with the new battery as well it takes only a second ) and there doesn't seem to be any damage being done to the SM drive or the ring gear but I am unhappy that it is doing it. Anybody got any ideas what it may be thats causing it and how to solve 🤔 I guess something is not lining up Cheers, W.Nut . Rosso Superlight no.087 Link to comment Share on other sites More sharing options...
Tom White Posted October 19, 2005 Share Posted October 19, 2005 The problem is usually the mechanism that ensures that the starter turns the flywheel in the cranking phase, and then spins or free wheels between the engine firing and disengagement ( there must be a technically correct name for it ). I stripped my starter ( K series standard starter) and thoroughly cleaned this mechanism, be warned it is not easy to get apart and even more difficult to re-assemble. The mechanism works on the basis of needle rollers being allowed to rotate in one direction and jamming in the other. I gave mine a small amount of light machine oil which did the trick for at least the mean while ( it hasn't squealed for the last 4k miles). Hope this helps Tom Link to comment Share on other sites More sharing options...
Wingnonut Posted October 19, 2005 Author Share Posted October 19, 2005 But it's a brand new SM 🤔 I'm loath to take apart a brand new unit. It grounds for sending back? W.Nut . Rosso Superlight no.087 Link to comment Share on other sites More sharing options...
Mick Day Posted October 19, 2005 Share Posted October 19, 2005 Alternator belt slipping? Link to comment Share on other sites More sharing options...
Beelzebub Posted October 19, 2005 Share Posted October 19, 2005 I thought about the alty belt slipping too. Mine used to do this during start up. No visual signs of wear on the belt but it was several years old. New one stopped the screeching 😬 Link to comment Share on other sites More sharing options...
Wingnonut Posted October 20, 2005 Author Share Posted October 20, 2005 Certainly not the Alt Belt. Definately coimg from the SM/Ring Gear when engaging and turning over. W.Nut . Rosso Superlight no.087 Link to comment Share on other sites More sharing options...
Peter T Posted October 20, 2005 Share Posted October 20, 2005 Have you checked the alignment of the starter motor? If it is not squarely bolted up to the flwheel then it can be rubbibg on the pinion teeth ? Are you sure that it is not touching the flywheel, or any weld marks? Check with a torch and rotate the engine with a spanner to see if there is any score marks on the flywheel. Also examine the pinion wheel on the motor to see if it has any uneven score marks on it . Carbon Components Here K9 Composites Link to comment Share on other sites More sharing options...
Wingnonut Posted October 20, 2005 Author Share Posted October 20, 2005 Checked its sitting square and checked both ring gear and pinion gear and neither seem to be oddly marked. Once it's started, running and the SM has disengaged then every thing is fine. It's just the starting process that makes the noise. If i hadn't heard it from the old motor I would have thought it was the new unit it's self but because it has happened with both I can only assume it must be something to do with the fitting Think'll have another fiddle and see if I can make it go away 😬 W.Nut . Rosso Superlight no.087 Link to comment Share on other sites More sharing options...
I.Mupferit Posted October 21, 2005 Share Posted October 21, 2005 Does it only make the noise whilst actually cranking the engine? If so, could it be the ring gear slipping on the flywheel? Now that you have a new starter motor and battery, maybe the additional starting torque available is causing the ring gear to slip if it is already slightly loose. To test this theory you could mark the position of the ring gear on the flywheel with a dab of paint, start the engine then switch off and look to see if the ring gear has slipped relative to the flywheel. Brent 2.3 DURATEC SV Reassuringly Expensive R 417.39 😬 Link to comment Share on other sites More sharing options...
Wingnonut Posted October 24, 2005 Author Share Posted October 24, 2005 Thanks Brent. I'll give it a go tonight! I thought the ring gear was a fixed part of the fly wheel. Didn't realise it was separate. Why would that be? W.Nut . Rosso Superlight no.087 Link to comment Share on other sites More sharing options...
Manxseven Posted October 24, 2005 Share Posted October 24, 2005 so you can change the ring gear without having to ditch the whole flywheel. L7 BDA Supersprint Joy here 😬 Link to comment Share on other sites More sharing options...
Bozz Posted October 24, 2005 Share Posted October 24, 2005 Yes I remember reading somewhere about tack welding the ring gear in place to prevent it rotating relative to the flywheel. Can't think where though now Bozz It's not MANGO it's TANGO (McLaren Orange and Black 1.6SS) Link to comment Share on other sites More sharing options...
Wingnonut Posted October 24, 2005 Author Share Posted October 24, 2005 Oh great! I can see another "engine out" on the way then ☹️ W.Nut . Rosso Superlight no.087 Link to comment Share on other sites More sharing options...
I.Mupferit Posted October 24, 2005 Share Posted October 24, 2005 If the ring gear is rotating and you repair by tack welding, remember to have the balancing checked. Brent 2.3 DURATEC SV Reassuringly Expensive R 417.39 😬 Link to comment Share on other sites More sharing options...
Bozz Posted October 28, 2005 Share Posted October 28, 2005 Eureka I've found it .......and the link I was looking for..... here I knew I'd remember it in the end 😬 Bozz It's not MANGO it's TANGO (McLaren Orange and Black 1.6SS) Edited by - Bozz on 28 Oct 2005 20:11:53 Link to comment Share on other sites More sharing options...
frankyknuckles Posted October 28, 2005 Share Posted October 28, 2005 Richard, if you need a hand taking the engine out, give me a shout, I may be able to help. www.R300.net Link to comment Share on other sites More sharing options...
Wingnonut Posted October 31, 2005 Author Share Posted October 31, 2005 Dave, you'll be first on the list if the time comes trust me Thanks for the link Bozz. Got the tipex out on saturday and marked the ringgear and flywheel. Started the car a number of times and dispite the screaching the ring is not spinning on the flywheel I give up. I'm growing quite fond of the noise now 😬 W.Nut . Rosso Superlight no.087 Link to comment Share on other sites More sharing options...
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