I’m sorry to report that something has gone wrong.
As discussed in earlier posts, I wanted to move the camshafts back to TDC after rotating them slightly forward in order to access the setscrews on the camshaft sprockets. I could have done that by moving them forward, all the way back to TDC, a tedious job given that I can only move them forward a slight bit at a time, by rotating the crankshaft. So I decided to rotate the crankshaft backwards.
Using a 1 5/16” box wrench (about 2 feet long and 5 pounds) I rotated the crankshaft backwards. And, as we discussed, I turned the crankshaft, and therefore the cam shafts backwards, slightly beyond TDC so that I could then turn the crankshaft and camshafts forwards to TDC, picking up any slack in the various mechanicals.
So again, I got the camshafts slightly beyond TDC, and then attempted to turn them forward to TDC. However, turning the crankshaft forward, the camshafts did not move. I observed that the chains attached to the sprockets were reacting to the turn, but did not move. I don’t know what happened, but I would guess that chains have disconnected from whatever mechanism causes them to move.
I would appreciate any thoughts on how to diagnose and fix whatever happened.