Hi Alan,
Removing the distrib. rotor and then trying to wiggle the shaft with
your fingers will pretty much tell the tale. If it wiggles more than
just perciptibly there's excess wear.
Another way to check it is to hook up a dwell meter. Although this may
skip around a bit at idle, it should smooth out to a steady reading at
1200 rpm or so. One doesn't particularly care if that happens at idle
speed, only if at operating speeds.
There was a thread on the net a month or so past about setting the
total spark advance. If you missed it, post the question again. General
opinion is that factory settings didn't advance the spark nearly far
enough.
I'll pass on testing for wear in the timing chain system. One uses a
degree wheel, but I have never done it.
Bob
On Wed, 03 Sep 1997 09:52:42 -0500 Alan Lott <lottala@mail.auburn.edu>
writes:
>Hi All,
>
>I've had my new project B for about a month now and it is progressing
>nicely. Yesterday, with the arrival of my rebuilt carbs, I was finaly
>able
>to drive it. After it was hot, I put my timing light on the car (vac
>advance hose off and plugged), and the timing mark jumped around
>considerably. There is also an intermittent (sp?) miss that is most
>pronounced at idle. (Also, the idle speed won't stay put.) The
>ignition
>parts are all good, so I'm thinking: worn distributor and/or worn
>timing
>gear and/or chain. Any other suggestions? How involved is checking the
>timing running gear? How does one check the distributor and what parts
>need
>to be replaced if it is found to be "out of whack?" Thanks for the
>help.
>
>
>Regards,
>
>Alan Lott
>GTA Dept of RSE
>Auburn University
>
>'71 MGB (rolling restoration)
>
>"Diplomacy is the ability to let other people have things your way."
>
|