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valve noise update 200 1977

posted by  someone claiming to be 81242DLB21FCA on  Sat Apr 17 04:22 CST 2004 [RELATED]

Just finished listening to the wav file and reading your previous posts. Since the cam turns at twice crank speed, a rapid sound at idle is mostly likely valve train noise. If the tolerances are good, then I would guess any tapping noise is either the bucket hitting the valve stem or the valve hitting the seat. In your April 12 post you mention a loss of power. Therefore, I recommend a compression check before disassembling anything.

To me, releasing the cam using the bearing nuts is unsettling because the studs are not quit long enough to completely relax all the springs. Here is an improvised tool based on the one pictured in the green manual. Tighten the nuts untill the cross bolts contact the cam. Then remove the cam bearing caps. Finally, lossen the nuts untill all the springs are fully relaxed. The cam cover studs are more than long enough to do this.







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