Good Morning Tony & Pmax
Tony,
Thanks so much for your assessment! I may take you up on the loaner WUR! I'll send you a PM after I’m finished futzing around with this one..
The CIS problem I had with the engine running, was that the RPMs would climb to about 4,000 and then dive to about 1,000 RPMs -- climb and dive, climb and dive, climb and dive – six to ten times – and then stall out. Operating the throttle I could keep the engine running, but that didn’t stop the fluctuation. Releasing the throttle, the engine would do it’s up and down ‘death dance’ and finally cut out.
I don’t have a warm control pressure with vacuum, because I haven't run the engine since I started hearing the tapping sound. I do have a hand vacuum pump, so I’ll try Pmax’s suggestion and test with vacuum this afternoon.
When I heard the rhythmic tapping sound at the right rear of the engine, I shut it down and started panicking over the possibility that I’d just found my lost woodruff key!
As you suggested, I dropped the sump and started exploring with my just-purchased bore-scope. Exploring the crankcase, what I can see of the timing chain, and running the scope into the accessible oil return tubes – I haven’t found my woodruff key, or any obvious damage.
I’ve attached some photos taken with the Endo-scope, but they’re not very good, mostly because I don’t know what I’m doing! I don’t know whether to take the valve covers off and continue exploring with the scope – or should I call it a day, regarding my lost woodruff key??!!
Pmax,
The film was especially helpful, so thanks also to ‘powah Rawk!’
And thanks for the vacuum tip, I’m going to try that.
Glad you enjoyed the abstruseness! English major, yup. Two majors actually, graduated with honors in history. Lifelong student, which means I just haven’t grown up! :-)
Thanks to all!
