Thread: Valve clearance question
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Old 11-03-10, 22:40
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Quote:
Originally Posted by 66T View Post
Does any one know why the workshop manual says that TDC has to be determined by referring to the normal flywheel marks and the mark on the cam sprocket? Seems to me that TDC is TDC.
The valve clearance is set when the piston is at TDC on the firing stroke with both valves closed. Turn the crankshaft a further 360 degrees to TDC & the cam shaft is on valve overlap, meaning you are coming off the exhaust cam lob & going on to the inlet cam lob, you cannot set the valve clearance in this position because the base circle of the cam lobe is not on the valve rocker & both valves can be open at this point..
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