924Board.org

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

I've just confirmed that part 931.123.199.00 is NLA from Porsche. These are the critical sleeves required for the three shouldered bolts (931.123.197.00) that attach the turbine housing to the exhaust manifold. The bolts are plentiful at the moment, but are completely useless without the sleeves. The sleeve is apparently designed to allow for thermal expansion of the bolt without loosening.

I know where I can get at least one of the sleeves NOS. I have a source lined up who can determine the material based on an OEM sample and can replicate the sleeve. The challenge is that the sleeves retail for something like $23-$25 US each, and replicating them in small volume may be even more costly. FWIW, the OEM bolts are something like $36 US each. So a complete set of three OEM equivalent fasteners would run a whopping $177.

In the meantime, I will be ascertaining the feasibility of the Stage8 approach on my club sport build. But to be clear, it's not likely that the Stage8 approach would be serviceable with the engine in situ. This may be a moot point if the bolts don't back out to begin with, but I doubt one could maneuver the Stage8 clips into place with the engine in the car.

Is it worth it to you to maintain the OEM design? Seems like $177 could buy a lot of other stuff, because I'm pretty sure we could come up with a suitable Stage8 alternative for a fraction of that cost. Remember that Stage8 already offers multiple applications for exhaust header and turbo locking fasteners, so I don't think there's anything unique about the heat cycles on our car that would make the Stage8 fasteners untenable.

Feedback please.

(and yes I know this could be over in 931 tech, but thought it would get more exposure here).
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erstwhile owner of just about every 924 variant ever made

Carrera RSR · Joined: 08 Jan 2010 Posts: 2312 Location: Somerset, UK

Dan, if as you say you have more than one NOS available, I would like to get my hands on one before the end of August to ensure that whilst my clutch replacement is carried out I can replace the lost bolt, sleeve, sealing ring and gaskets in one job. $25 is a high price but considering the cost of all the work involved I'd like to get the job done right first time. I currently have all parts ready to go except the sleeve.

Please pm me if you can arrange the purchase of this and ship asap. I will pay as per arranged on previous purchases.

Thanks
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Question: have people had trouble with studs and copper lock nuts? When I tore mine back down, they were piss tight. . .but only had 10k or so miles on them.
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WeiBe (1987 924S 2.5t) - 931 S3

Min · Posted: Fri Aug 06, 2010 1:04 pm Post subject:

wow, that's a retarded price. Its just a sleeve right? I'm sure i could make up a bunch should that become necessary. Find out the material, send it my way and I'll do up a drawing. Once i know the size and material, I should be able to figure out how much I can make them for. Shouldn't be that much unless they are made out of something super special, which I doubt.

Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

Scorpio · Posted: Fri Aug 06, 2010 2:13 pm Post subject:

^ I like..
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1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!

Carrera RSR · Joined: 08 Jan 2010 Posts: 2312 Location: Somerset, UK

One thing for sure, they can't be picked up with a magnet after dropping one into the turbo area and needed to pick it up!!

Got my new bolt into the bottom hole. Took 1.5 hours of messing about!! Although better having three bolts back in the gasket/sealing ring is trashed. Using some washers in a top bolt which isn't ideal. Need a replacement sleeve before 27th August please.
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

I don't have a sleeve on the shelf, but I have identified a single item at a dealer here in the states. You might try checking several dealers on your side of the pond, will be the quickest way to get one...

@Rasta
How are you using studs? I thought 2 of the 3 bolts were nutted on the other side? Am I wrong about that?

@Min
Even if we can make the sleeves for less than $25 each, the bolts are still $36 each. I think we can come up with a more cost effective solution.

Does anyone have the exact length of the shouldered bolt? All of mine are in cars at the moment so I have no way of measuring. Would be helpful to know the length of the entire shaft (do not include the head portion in the measurement), as well as the length of the threaded and non-threaded portions. Also the length of the sleeve.
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erstwhile owner of just about every 924 variant ever made

ic932 · Joined: 11 Feb 2005 Posts: 1104 Location: UK

Better PM mw quick before I get banned lol.

I got 2 of these.

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

How about some measurements?
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erstwhile owner of just about every 924 variant ever made

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Sheesh, I must be getting old.

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erstwhile owner of just about every 924 variant ever made

Min · Posted: Sat Aug 07, 2010 3:27 pm Post subject:

Lizard · Posted: Sun Aug 08, 2010 2:00 am Post subject:

It has been YEARS since I have worked on the 931.

However if my memory serves me correctly the studs/bolts on the S1s that I worked on used M10 hardware.

In a turbo application use only regular mild steel (grade 8.

hardware. DO NOT use stainless.

The sleeve is not actually required and can be forgone. Though it does make it easier to get in and out.
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3 928s,

ic932 · Joined: 11 Feb 2005 Posts: 1104 Location: UK

Lizard, I think you are correct. These are S2 items and FAIK RHD specific? But I can't think of a reason why.

I'm not sure that a third bolt/spacer was ever used on the underside? Seems strange that I only have the 2. But like Lizard, is been awhile now.

As for specs, I've passed that on to the buyer. (I only charged for secure postage). I'm sure he will oblige.

Material is unkown but might well be more expensive then gold lol. I worked for avation metals (local M.O.D, F1 ect suppliers) So I could id if really really nessasary...but probably not needed lol.

stevekat · Joined: 19 Jan 2008 Posts: 719 Location: Los Angeles, CA

The bolts appear to be a special material from what I have observed, or at least hardened in a way that is not common for standard automobile bolts. As far as the collars, once the material is identified, as long as it is machinable, cost should be modest to make the collars. It is drilling a hole in a rod of this material and then cutting off individual collars from the rod one by one, with the length accuracy not being particularly critical (ie: fractions of a mm, not .01's or .001's.)
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"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.