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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: 5570" data-attributes="member: 109"><p><strong>Hi Greg, here's the reply:</strong></p><p></p><p>Hi Greg,</p><p></p><p>1 - Oil</p><p>15/40 mineral oil throughout except for whatever was in the bike when I bought it - I ran than for 500 miles and changed it. No metallic oil - as I said, I have saved every change and filter - tomorrow I will sieve the oil and open up the filters to check. 9 out of 10 times Procycle and once Halfords own brand ( a car accessory shop in the UK ).</p><p>2 - Miles</p><p>2500 miles. One fill with whatever was in it when I bought it, one fill with Halfords as above and 1 litre of what was in the petrol station when I went to the Riders Rally and it ran low after 400 miles on the way home having been on the motorway at 70 MPH for a couple of hours. Still loads visible in the oil tank and returning through the tank though - just low below the filler neck.</p><p>3 - Metallic</p><p>See my earlier note reference what I found and felt in the oil when I drained it each time - I looked and studied it meticulously.</p><p>4 - Valve Clearances</p><p>There aren't any tappets in a Vincent - but I have done the valve clearances twice - first time after I torqued the heads down properly after running in as instructed and then the second time about 800 miles ago - both times took up a little adjustment - but nothing exorbitant - I was told it as a little unusual to have to do it a second time though. </p><p>5 - Pushrod stuck</p><p>I lifted it out of the tube having removed the tank - and polished it and replaced it spinning fine - it spins fine now - of course I now suspect that the particular cam follower getting hot had contributed or caused that particular problem.</p><p>6 - Cams</p><p>They are described in the invoice for the engine work as Mk 3 105 degree. I know you know who did the engine work and they are his cams. The profile looks nothing like an original mark 3 that I have put alongside it though as a matter of interest.</p><p>7 - Blue from heat</p><p>The cams are not blue - but the followers certainly are - but with that level of friction taking place I guess you'd expect to see that. I suspect that the heat in the followers is what has caused the stuck pushrod and I now know that Russ Kemp was right when he suggested that I open the timing side and find out what was causing the stuck pushrod earlier on. Interestingly a completely opposite view was taken by some pretty experienced Vincent engine guys which was to leave it alone completely. If I had opened the timing case I may have found the wear problem earlier, or even the fault being caused with the exhaust lifter which has probably excerarbated the problem.</p><p></p><p>Hope that helps - look forward to your views Greg as I have watched your comments being pretty much on the money.</p><p></p><p>Regards</p><p></p><p>Stuart</p></blockquote><p></p>
[QUOTE="BlackLightning998, post: 5570, member: 109"] [b]Hi Greg, here's the reply:[/b] Hi Greg, 1 - Oil 15/40 mineral oil throughout except for whatever was in the bike when I bought it - I ran than for 500 miles and changed it. No metallic oil - as I said, I have saved every change and filter - tomorrow I will sieve the oil and open up the filters to check. 9 out of 10 times Procycle and once Halfords own brand ( a car accessory shop in the UK ). 2 - Miles 2500 miles. One fill with whatever was in it when I bought it, one fill with Halfords as above and 1 litre of what was in the petrol station when I went to the Riders Rally and it ran low after 400 miles on the way home having been on the motorway at 70 MPH for a couple of hours. Still loads visible in the oil tank and returning through the tank though - just low below the filler neck. 3 - Metallic See my earlier note reference what I found and felt in the oil when I drained it each time - I looked and studied it meticulously. 4 - Valve Clearances There aren't any tappets in a Vincent - but I have done the valve clearances twice - first time after I torqued the heads down properly after running in as instructed and then the second time about 800 miles ago - both times took up a little adjustment - but nothing exorbitant - I was told it as a little unusual to have to do it a second time though. 5 - Pushrod stuck I lifted it out of the tube having removed the tank - and polished it and replaced it spinning fine - it spins fine now - of course I now suspect that the particular cam follower getting hot had contributed or caused that particular problem. 6 - Cams They are described in the invoice for the engine work as Mk 3 105 degree. I know you know who did the engine work and they are his cams. The profile looks nothing like an original mark 3 that I have put alongside it though as a matter of interest. 7 - Blue from heat The cams are not blue - but the followers certainly are - but with that level of friction taking place I guess you'd expect to see that. I suspect that the heat in the followers is what has caused the stuck pushrod and I now know that Russ Kemp was right when he suggested that I open the timing side and find out what was causing the stuck pushrod earlier on. Interestingly a completely opposite view was taken by some pretty experienced Vincent engine guys which was to leave it alone completely. If I had opened the timing case I may have found the wear problem earlier, or even the fault being caused with the exhaust lifter which has probably excerarbated the problem. Hope that helps - look forward to your views Greg as I have watched your comments being pretty much on the money. Regards 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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