[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.

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

More information about the type3-vwtype3.org mailing list