adjusting valve timing by adjusting tappets to open .

bootucker10@hotmail.com · Aug 15, 2018

my question is the spec says to rotate cam to set #1 exh valve to open on mark which is before piston reached bdc .. my opening occurs at bdc .. so can I adjust the valve to open on mark by setting that exh valve to just open and then adjust also the other valves to open same sequence - #2 cylinder open on opposite mark and the intake open just prior to tdc after exh ? I doe anyone know when each valve should be swet to open .. the current spec says open exh when about 20 degrees prior ro bdc , and with this it seems like the intake valve will open a bit before tdc .. but I don't see any specs on each valve .. it seems like if I adjust each valve by adjusting opening rather than rotating to\he cam would do the same thing??

Barry Ayres · Aug 15, 2018

no sorry its won't as advancing timing this way the tappet clearance will be far too small resulting in stuck / burnt valves. you have probably pushed the valve open a little
more than normal causing it to stick open as others have said free it off with a little oil and turning motion then reset the tappetts half a turn of the adjuster open.
recheck push rods for straightness then if all ok reset timing. (see previous post) its not difficult should only take ten minutes. i would not worry about low pressure on
one side till after you have it running unless its v v low.

MSD · Aug 16, 2018

If you turn flywheel till the valves are all closed and the impulse mark lines up with the bottom governor bolt closest to the flywheel, you can set all the valves at one time. It's
the spot on the cam where they are all closed.

bootucker10@hotmail.com · Aug 20, 2018

I can set clearance on tappets fine . it's adjustment of cam shaft rotation for #1 exhaust valve to open on the mark . that sets the correct valve opening since all lobes follow that setting . think I may have rotated the cam gear on the camshaft which means that the #1 exhaust valve will open differently .. I don't have any other answer as to why it's about 20 degrees off ( opens about bdc which is about 20 degrees from the mark) . the cam gear is bolted to the cam shaft . and woodruff keyed . so if it rotated ( by added forces of over revving the engine ) then will need to remove the cam and fix woodruff and cam gear position .. putting the exh valve opening on the mark .. lot's of work .

adjusting valve timing by adjusting tappets to open .

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