Quote:
Originally Posted by Tippy
Are the cylinders machined and the case spigots?
Sounds like valve to piston contact? Backing off all rockers, then spinning again might tell what's going on.
If there is still noise, wonder if the pistons are contacting the heads from question above?
Did you ever do a clearance test between valves and pistons?
|
Tippy,
The cylinders nor the crankcase was not machined. The first time the engine was assembled, the engine rotated 360 degrees without noise coming from the cam or valves areas. But the engine was partially disassembled when I discovered that the cam shafts were inadvertently installed at the wrong bank. Thus requiring another cam timing and valve adjustment job. Unfortunately, exhaust rocker #6 broke and bent the valves. Requiring another partial disassembly for the cylinder head removal and inspection.
Now, during the 3rd. cam timing job, I noticed the peculiar noise when I turned the crankshaft pulley with only cylinders #1 & #4 rockers installed. If my recollection is correct, it was every 1/2 turn of the crank pulley I could hear the slapping noise. Hope this explains clearly what I've been having. Thanks.
Tony