When adjusting the valve clearances today on the cylinder head that had been removed and stripped of it's cam/rocker assembly (the cam wasn't removed from its journal). there was an extreme notchy feel/sound when the valves transitioned from fully open on the high point of the cam to begin closing.
After stripping the rocker assembly twice, I traced this notchiness to the cam sprocked bolt not being fully tightened. I knew the bolt hadn't been done and was surprised that it made any difference when hand turning the engine (plugs out) for adjusting valve clearances. Hand turning the engine with the rocker assembly removed and fingers pressed in the buckets produced no notchyness.
After tightening the sprocket, things were a lot smoother, however I am wondering if is there is any lateral float gap setting on the cam assembly that should be set when fitting cam assembly back in the head. I have set the vertical play in the rocker arms.
Now there's an almost imperceptible feel when the valves start closing but I think I might be paranoid or it may be the cam chain relaxing as the valve springs pressure is releaved.
Valve Clearances & Cam 'float' setting?
Moderators: slparry, Gromit, Paul
Valve Clearances & Cam 'float' setting?
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bigblackfalco
- Posts: 1922
- Joined: Wed Feb 18, 2004 10:05 am
- Location: Darkest Aberdeenshire
The cam sprocket is located on a key type arrangement on the camshaft...it is easy for it not to fully locate....and then when you do the bolt up it don't sit correctly.I very much doubt if the end float would go out of tolerance in the working life of an engine as all the wear forms from the up down motion of the cam/vs valves.....nothing of concern me thinks.
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