[Mike Kelly]

The camshaft is seized, will not rotate at all - rock solid Any ideas ????? The oil pump is still in situ but that isnt causing the problem .

The spring loaded button provides a slight preload onto the camshaft, the button rides against the timing cover . Apparently the helical gear drive to the oil pump/distributor provides the pushing force onto the spring loaded button , forcing it against the timing cover ?

I think moisture has made its way into the camshaft bearings , and over time these bearings have seized . In theory the camshaft should pull out easily .