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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Catastrophic camshaft and follower failure - any ideas?
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<blockquote data-quote="BlackLightning998" data-source="post: 5563" data-attributes="member: 109"><p><strong>Latest update - any more thoughts?</strong></p><p></p><p>Evening All,</p><p></p><p>To keep you posted here is an update:</p><p></p><p>1 - New cams, followers and exhaust valve lifter parts on their way (ouch!)</p><p></p><p>2 - Oil and Debris</p><p>Andy asked about it - there was a little bit on the end of the magnetic sump plug and a tiny bit of discolouration here and there in the oil on each change - but nothing that concerned me when it is an alloy engine with a load of new bearing/working/wearing parts all making friends inside. I have kept all the oil changes marked in sequence (anal) and the cartridge filters bagged and marked so I will take time tomorrow to sieve the oil and open up the cartridges to have a closer inspection. The oil dropped from the timing chest when we opened it up is smooth to the feel and no visible debris.</p><p></p><p>3 - Valve Springs</p><p>Peter asked about these, and funnily enough Patrick Godet's first thoughts were of valve springs when I rang him to order the new cams - and sure enough his measurements are spot on (thanks Patrick) - the outer springs actually fitted in my engine are 0.160" and KTB says standards are 0.150" - or 04.06mm versus 03.75mm for the younger chaps, so it looks like I have stronger than standard springs in the bike and perhaps this has been a contributing factor to the problem? What do people think (before I change them please)?</p><p></p><p>4 - So more parts....</p><p>So the heads are coming off and all the necesary parts to replace the springs back to standard are ordered.....(ouch again!!)</p><p></p><p>So, looks like I might just make the Manx GP, but you'll all have to excuse me the Annual Rally as I think I won't have anything left for the £8 B-B-Q now!!!!!!</p><p></p><p>Oh - and Peter asked if I still like Vincents, I love them, and particularly this machine and this experience is not going to put me off yet - but I am not too happy at the moment.</p><p></p><p>Regards and thanks to all - grateful for any further thoughts and advice.</p><p></p><p>Stuart</p></blockquote><p></p>
[QUOTE="BlackLightning998, post: 5563, member: 109"] [b]Latest update - any more thoughts?[/b] Evening All, To keep you posted here is an update: 1 - New cams, followers and exhaust valve lifter parts on their way (ouch!) 2 - Oil and Debris Andy asked about it - there was a little bit on the end of the magnetic sump plug and a tiny bit of discolouration here and there in the oil on each change - but nothing that concerned me when it is an alloy engine with a load of new bearing/working/wearing parts all making friends inside. I have kept all the oil changes marked in sequence (anal) and the cartridge filters bagged and marked so I will take time tomorrow to sieve the oil and open up the cartridges to have a closer inspection. The oil dropped from the timing chest when we opened it up is smooth to the feel and no visible debris. 3 - Valve Springs Peter asked about these, and funnily enough Patrick Godet's first thoughts were of valve springs when I rang him to order the new cams - and sure enough his measurements are spot on (thanks Patrick) - the outer springs actually fitted in my engine are 0.160" and KTB says standards are 0.150" - or 04.06mm versus 03.75mm for the younger chaps, so it looks like I have stronger than standard springs in the bike and perhaps this has been a contributing factor to the problem? What do people think (before I change them please)? 4 - So more parts.... So the heads are coming off and all the necesary parts to replace the springs back to standard are ordered.....(ouch again!!) So, looks like I might just make the Manx GP, but you'll all have to excuse me the Annual Rally as I think I won't have anything left for the £8 B-B-Q now!!!!!! Oh - and Peter asked if I still like Vincents, I love them, and particularly this machine and this experience is not going to put me off yet - but I am not too happy at the moment. Regards and thanks to all - grateful for any further thoughts and advice. Stuart [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Catastrophic camshaft and follower failure - any ideas?
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