GT6DavidMK1 Posted January 25, 2008 Share Posted January 25, 2008 Some very interesting Cam followers, taken out of a customers Spitfire this week, not the first time I have seen this, though not as many in one car even the camshaft was bad. Link to comment Share on other sites More sharing options...
JohnD Posted January 25, 2008 Share Posted January 25, 2008 Those cam lobes are scored all the way around! Did the PO close up the tappet gap to zero?And the followers are eroded all over the face! Right up to the edges!This must be a metallurgical problem, not poor maintenance or cackhanded adjustment.What's the rest of the engine like? Is the oil like gravel?John Link to comment Share on other sites More sharing options...
GT6DavidMK1 Posted January 25, 2008 Author Share Posted January 25, 2008 I had advise the customer a year ago that there was a problem with the cam and followers, he finally spent some money on the car, camshaft I think was a fast road ;) not any more :PDavid. Link to comment Share on other sites More sharing options...
Richard B Posted January 25, 2008 Share Posted January 25, 2008 They look more like 'Rounds' now rather than 'Cams' ;D Link to comment Share on other sites More sharing options...
phil866 Posted January 25, 2008 Share Posted January 25, 2008 I understand that there were bad batches of cam followers a while ago, do you think that this is some of them? They look almost corroded as well as hammered! Link to comment Share on other sites More sharing options...
DJB_Harvey Posted January 25, 2008 Share Posted January 25, 2008 Crikey ! they are bad ..ive seen the odd one or two on the same engine a few times but not as bad as them...So then who supplies the best followers nowadays or is it a lucky dip ? Link to comment Share on other sites More sharing options...
GT6DavidMK1 Posted January 25, 2008 Author Share Posted January 25, 2008 I think it was the camshaft that broke up and mashed the followers, was not a standard camshaft, fast road I think, so might have not been treated correctly. Link to comment Share on other sites More sharing options...
lordleonusa Posted January 28, 2008 Share Posted January 28, 2008 Hi Dave,Once I did something very nasty to a set of toilet tune 'tuftrided' 'uprated' cam followers in my Herald.This is not for the squeamish!Léon Link to comment Share on other sites More sharing options...
JohnD Posted January 28, 2008 Share Posted January 28, 2008 Leon, Steve,Why are the followers' faces covered all over with marks?The cam bears on a small area of the face, just off centre, so that the follower rotates slowly in use. A worn cam, or gritty oil, would produce a worn ring around the centre of the face. There's nothing to make any particles ricochet around the face. like a piece of broken valve inside a chamber, marking the piston top all over.What's happening to these followers?John Link to comment Share on other sites More sharing options...
GT6Steve Posted January 28, 2008 Share Posted January 28, 2008 Hi John, I think that kind of damage is from the follower either breaking thru or not having been properly hardfaced. Then the soft metal microwelds itself to the cam and "grabs" bits off. We see it a lot here in the plant between HARD cam follower rollers pounding thru the cams. I can't make out how bad the cam is but if it's still hard it could clean up with a file and paper. Not that I'd want it in the racer ;D Link to comment Share on other sites More sharing options...
GT6DavidMK1 Posted January 28, 2008 Author Share Posted January 28, 2008 The camshaft had 4 lopes missing worn down to stumps :)David. Link to comment Share on other sites More sharing options...
GT6Steve Posted January 28, 2008 Share Posted January 28, 2008 Dang, may not clean up so well... :'( ;) Link to comment Share on other sites More sharing options...
JohnD Posted January 28, 2008 Share Posted January 28, 2008 Ah, so!It WAS metallurgical!John Link to comment Share on other sites More sharing options...
junkuser Posted January 28, 2008 Share Posted January 28, 2008 In the last picture on the original post there appears to be pitting in a non-bearing surface. Link to comment Share on other sites More sharing options...
lordleonusa Posted January 28, 2008 Share Posted January 28, 2008 I believe that it was poor heat treatment of the so-called tuftrided followers from toilet tune that caused the problem.The camshaft appeared to escape significant damage, but I did not re-use it, just in case.I have also never used toilet tune cam followers since that happened.L Link to comment Share on other sites More sharing options...
trackerjack Posted January 31, 2008 Share Posted January 31, 2008 GT6DavidMK1 wrote:The camshaft had 4 lopes missing worn down to stumps :)David.Apologies for going off thread GT6DavidMK1 but I have to tell you that I saw an AC3000 ME in Portsmouth last night or the night before in the same colour as yours, was it you? as they are pretty rare. Link to comment Share on other sites More sharing options...
GT6DavidMK1 Posted February 1, 2008 Author Share Posted February 1, 2008 I was in Cumbria yesterday collecting a car, nice seeing the lake district though ;D.They are a rare sight AC 3000me's as they only made approx 120 cars 8)David. Link to comment Share on other sites More sharing options...
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