Sticking my neck out here, and I'm no expert on this (just applying knowledge of mechanical enginering experience gleened over 50 years.)Mattylad wrote:HHMM My reply seems to have disappeared on here.
I know it seems very coincidental widdowsman but we are indeed seperate people.
Are there any tests worth while doing to see if the cam shaft snapping is just a cause of something else not being right?
I travel to a festival near brighton next week and am very paranoid.
Matty
I have thought about how the camshaft and bearing housings were possibly manufactured.
Because the cam rotates at a fairly high speed, it is paramount that the bearings are all in line and the only way this can be achieved is to fit the caps and bore straight through in one setting. This means that each cap is unique to its pedestal and are strictly speaking NOT interchangeable. Similarly, to maintain true lineability, a particular cap should be fitted the same way round as it originally was. Any deviance from this will mean that the original alignment is not maintained. The result of interchanging caps will be a slight misalignment which, when the caps are tightened down, will result in one or more of the bearings being tight. At the speeds and temperature we are looking at, the results could be exactly what you have experienced.
So what I am saying is that if I ever had to do this job, I would mark the caps and pedestals BEFORE taking it to bits, and I would make sure that each cap was replaced on its original pedestal in the original orientation.
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