[T3] On a 73 T-3 SB fuel injected aut trans pinging .
Jim Adney
jadney at vwtype3.org
Mon Dec 4 20:05:59 PST 2017
On 4 Dec 2017 at 13:35, William J wrote:
> Does it sound like the mechanical advance weights might be sticking ?
I've never seen a distributor where it was the weights that were sticking. The
thing that sticks is the relative motion between the upper and lower shafts.
There's a felt pad in the top of the upper shaft that should get a drop of oil
once a year. If you do this, it will never stick.
There are 2 ways to test your mechanical advance:.
One is simply with a timing light and the vacuum hose removed, so the only
advance that's active will be the centrifugal advance. Just watch the timing
marks with the timing light as you speed up and slow down the engine. If the
marks move, your mechanical advance is working.
The other way to check is to simply twist the rotor CW and see if you can
feel it turn against some spring pressure and then release it and watch to
see if it snaps smartly back. If it does, it's working.
The vacuum advance on the FI engines is just there to give a bit better gas
mileage at cruising speeds. It does nothing at idle or at full throttle. You
won't notice any change in performance if it's not working.
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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