78 sc vacuum advance

[venetian911]

My vacuum advance is broken...plate frozen according to mechanic.
Can I a) unfreeze the plate and rig the advance to work without a vacuum unit? If so how?
or b) use a vacuum unit from an 83 since that is the only year I can find?

thanks

venetian911

[schleg79]

Can't answer this one, but there are many here that surely can.

I'll bump this one for you and suggest you post a pic of your ride as a newcomer - keeping with the local customs might get you a warmer response...

Welcome.

Kevin

[oneblueyedog]

The plates may be able to be unfrozen by taking the vac advance units off and removing the service plate (oval pressed in plate). I then used starting fluid spray ( Ether) and turned the distributor upside down so all of the crud runs out the free end and not into the bushings! I manually rotated the plates and a rust like fluid came out between them. I rotated them until no more colored fluid ran out. I then liberally oiled the space between the plates after the dist. dried in an upside down position. I then put it all back together and tested the advance with a vac pump gently. And you could see the plates move via the advance bellows.

I do this bianually. I think there's a Bob Tindle article how to. He did not use the Ether though. Use the ether outside. Oil and grease before reinstalling.

[venetian911]

thanks, I'll give that a try. I have a vacuum advance unit on order from Germany. Will take three weeks to get here. In the meantime, I'll try loosening those plates.

[venetian911]

[Mysterytrain]

venetian..what exactly did you order and can you supply a part number. I've got an old 78SC distributor that is needing some parts.

[venetian911]

I ordered a distributor vacuum unit from the local porsche dealer. they were out of stock on this website and so was every other source I checked into. the part number as far as I can see is: 930-602-910-00-OEM
it is the vacuum unit on the side of the distributor.

best of luck,

venitian911