924Board.org

[rOOkie]

I'm giving the fuel distributor a rebuild according to this post:

http://www.924board.org/viewtopic.php?t=4711

but this is for a 924 fuel distributor. Has anyone done the same for the 931 Fuel distributor? Any major differences? I have it apart and I cant get the metering cylinder (hollow piece down the middle) out from the "head" to replace the o-rings. Is it threaded in? Riveted? Or just glued in cause it sat for 10 years... I don't want to force it...

thanks,
Geoff
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81 931 - A gift that keeps giving....

[dpw928]

Not sure on the 931 but my 928 had two orings that kept it in place. Actually mine came out very easily since the upper o ring had deteriorated and broken up. Before taking yours out, recommend you note the orientations so when putting it back together the slits/ports align.

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

[Smoothie]

I haven't done it myself, but from the experience of others you can expect the diaphragm (which is made of a very thin rubber sheet in the 931, unlike the 924NA which has a metal diaphragm) to be in well worn and brittle condition and just about guaranteed to tear if/when you seperate the top-bottom halves of the distributor. -And no-one seems to know where to get a replacement for it other than from another CIS car in a junkyard from the same era with the same diaphragm.
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"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[rOOkie]

Thanks, both good points.

By putting a soft spacer (pieces of paper) between the halves and tightening the 19mm nut I got the metering cylinder out.

I think it must have been rebuilt recently in its life, the rubber sheet and o-rings are still elastic. I cleaned all the parts with carb cleaner and have to replace one o-ring before putting it together. I guess it was just the sticky metering rod that was causing the trouble. Part of me wishes I had just left the thing together and fixed the rod, but it is good to know the rest of it is OK.

Crossing my fingers that it works and I don't have to send it to SpecialT for a professional rebuild. I wonder what those guys do for diaphragms?

cheers,
Geoff
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81 931 - A gift that keeps giving....

[randy_eich]

I took mine apart and the diaphram was junk, so after a couple of shots at the local parts house, they could not find any material to make a new one. So I asked yahoo about diaphram material and got some moulding outfit in Denver, I work at a DOE sight in Eastern Washington, and got our parts guy to make a call, the government really does have insider information, anyway the people told him that they only mould products and don't make the material, but they gave him the phone number to the people who do in Englewood CO, something like The Gasket Company, and they sent him a rather large piece of buna rubber material to see if it would work for our prototype system we were building here. (government jardon) The material was just alittle heavier than the material used in the fuel metering unit, but what the hell, I cut out a piece using the old one for a pattern, bought a metric leather punch(believe it or not) from the local Harbor Freight tool supply and popped in the holes, looked pretty damn good, so it's been over amonth driving daily without a hitch.

[randy_eich]

I still have enough to do about ten more if anyone wants to try.

[ideola]

Randy
Are you suggesting that you would make them, or that you send the material? I have three dizzies that will eventually need rebuilding...

let me know!
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erstwhile owner of just about every 924 variant ever made

[Tigger937]

[randy_eich]

I'll just mail you some of what is left, I don't need but maybe enough for 2 more.