Joe---I can't say whether "hitting the tree" damaged the timng chain, or
its sprockets. One would think that the cover would show something here.
So far as the timing itself, Bob and I exchanged info on noticing that
all spark plugs not firing at the same time, as picked up by the timing
light on plugs #1 & #6. I had noted that the cam that operates the
points weren't exactly symmetrical, and varied by as much as two
degrees. This was done by using a degree wheel and a dial indicator.
When later marking the engine's timing/damper every 120 deg., this also
showed the same results when the timing light pickup was placed on the
other spark plug wires. Nothing conclusive came of this, other than
it's there, and repeatable. Limited responses (one) came in to show
this could not be found with magnetic sensors, rather than points type
triggers.
One can get a fair test on whether the timing chain and takeup are in
good condition by noting the position of the distributor rotor, noting
the timing pointer against the deg. markings, and reversing the engine's
rotation. If the rotor changes direction within two deg. of reversing
the engine, it's a good indication that nothing is out of sorts in this
area. Note that it is better to hold the rotor by hand and take out any
play, before doing the engine direction reversal. I use the fan blades
when doing this. It's easier with the plugs out, but not necessary.
Can't offer anything about the noise you hear, other than those
stethoscopes are pretty good at pinpointing some engine sounds.
Dick
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