Hi David,
Yes yours sounds too advanced. The pinging pretty much tells the story. The
slower turning with the key on also does but not as obvious. Too advanced
fires too far before top dead center and tries to push the piston backwards
sounding like a weak battery..
A timing light used with the vac advance hose off is the very best way to
time it. In my opinion, the only way. I only use static timing when first
replacing the distributor, then follow with the strobe light.
Yesterday I mentioned the mechanical advance weights to Jeff because they
are often in very bad condition. Since they are hidden under the breaker
plate, They do not get lubed. After a lot of years they can bind, break
off, or just be very sloppy, and the return springs get rusty and
stretched . If they bind in, the timing won't advance at higher rpm so the
middle and top rpm suffer for lack of response. If they bind out, the
timing stays too advanced for the idle and starting.
With a timing light hooked up, you can test both advance mechanisms.
For the vacuum advance, remove the vac hose from the carb and suck on it,
You should feel it stop and not keep leaking air. While sucking and holding
you can watch the timing mark move to advanced and hold there until you let
up on the hose.
For the mechanical centrifugal advance, Leave the vac advance unhooked at
the carb, plug the hole on the carb if you can. Then with the timing light
on the mark, rev the engine and you should see the mark advance with more
rpms. Then when you let up on the revs, it will (should) return to the
basic setting.
Good luck,
Bob B
At 02:44 AM 3/3/2003, David Hope wrote:
>By coincidence I was going to ask the same question.
>
>On my llA with the push button start, the starter
>motor spins fast with the ignition off but slowly with
>the key is turned.
>
>Also, I get some pinking/knock going up hills under
>load.
>
>I have just installed a new, working vacuum advance.
>
>I have been advised to retard the timing by unscrewing
>the vernier screw on the vacuum advance by half a turn
>at a time until the knock on hills disappears.
>
>Is this correct. It seems a very long winded process.
>
>David Hope
>64 SWB
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