87 to 95 Flappy Butterfly valve screws
#1
Thread Starter
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Joined: Jan 2003
Posts: 16,839
Likes: 897
From: Double Oak, TX
87 to 95 Flappy Butterfly valve screws
I keep being asked for replacement screws for the butterfly valve to flappy shaft.
Has anyone been there and done that and can share the size please?
Has anyone been there and done that and can share the size please?
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
#2
Damn. I was going to ask you.
Last time I needed to replace them I found a reasonable substitute at the local True Value. But, the head wasn't quite right.
IIRC, it's a machine-head screw but an odd size.
If no one has the answer, I'll measure the remainder pictured here:
Last time I needed to replace them I found a reasonable substitute at the local True Value. But, the head wasn't quite right.
IIRC, it's a machine-head screw but an odd size.
If no one has the answer, I'll measure the remainder pictured here:
Last edited by worf928; 11-23-2015 at 08:44 AM. Reason: Rennlist can't spell
Trending Topics
#8
I lost one when I did my flappy a couple of weekends ago so had to go hunting. Its M4. I think I started with 10mm (might have been 15) and ground 75% off one side down to the point it stuck out of the pivot shaft. Then, when I inserted it I could bend the remaining 25% over to lock it. I did not want to try re-punching the divot as I was worried I might bend the pivot shaft. The head on the one I bought at home depot was wrong (too big) , so I ground that down as well. Of course the 'lost' part showed up as soon as I had the manifold assembly bolted back in the car.
#9
The home depot part was a flat head, probably similar to mcmaster 97613A523, which has an 8mm dia head, their oval head part, 90258A214 , has a 7.5mm dia head. That is closer, but I don't think its enough. I think you need something more like a 7mm head. The actual part is a slotted, oval head. I can send you one when I send the MAF core if you like.
#10
I got a whole box of these screws from when I was machining and changing the butterflies in 3.2 liter Carreras. I think I got them from the guy that made the oversize butterflies for me (who rebuilds and replaces worn butterflies in 911 mechanical injection throttles.)
That's been a couple of days ago....
Let me see if I can find that box.
#11
Chronic Tool Dropper
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Joined: Oct 2001
Posts: 20,506
Likes: 549
From: Bend, Oregon
Roger- foggy memory says they are oval head machine screws. Thy MUST be staked after tightening. I'm not ready to trust threadlocker alone. In carburetors I always used brass screws, FWIW, so if one did manage to come out it might get beat up and do a minimum amount of collateral damage on the way through.
#13
My 1990 S4 butterfly screws were loctited in, no flange on the end. The same applied to the butterfly in the spate TB I have.
I managed to damage the head on one getting it out.
Myles
I managed to damage the head on one getting it out.
Myles
#14
M4 x 8mm 0.7 pitch; 6mm head (machine head); slotted. (Edit: 6mm head seems a bit small; hard to measure the shard.)
About, maybe a bit less, than 50% of the time I can unscrew these. The rest of the time, drill and dremel.
Going back in, I heat the spindle with a heat gun and turn the screws in cold with red loctite. (That needs 500°F to loosen.)
Now for the next question: are they the same screws as for the throttle plate? (I forgot to measure when I was just out in the garage with the shards pictured above.)
About, maybe a bit less, than 50% of the time I can unscrew these. The rest of the time, drill and dremel.
Going back in, I heat the spindle with a heat gun and turn the screws in cold with red loctite. (That needs 500°F to loosen.)
Now for the next question: are they the same screws as for the throttle plate? (I forgot to measure when I was just out in the garage with the shards pictured above.)
#15