Weber 40IDA 3C rebuild gaskets
 

Has anyone found a source for an accurate, acceptable thickness, new Weber gasket #41710.001?
i have purchased a kit (from a well known supplier) and found that the main gasket is waaayyy off. As i look at 6 different suppliers kits that are pictured across the web, they all contain this same, miscut gasket. It is cut from an Italian marked gasket paper, which may mean it is cut in Italy. This gasket is used by all the Porsche guys running 40IDA 3C Webers. In my small scale photo here, you cant get the full inaccuracy of this gasket, but certainly a feel for it. There are 10 studs and 20+ holes that need reasonable alignment.
Helppppp
Craig
http://forums.pelicanparts.com/uploa...1159648885.jpg

I am attaching a link to a Porsche Weber 40IDA 3C page that contains what i hope will be the pieces that a rebuilder would require for a rebuild of a Weber. Please review this and let me know if it is correct or incorrect and i will revise it as needed. The purpose is to understand exactly what we need for a Weber rebuild. Thank you for any help on this topic
Craig
Porsche 40IDA 3C rebuild parts

Hello there.

It neds to be soaked in water for a bit before it fts..I then spray with wd40..

Kind regards
David

thanks David, this water soak seems reasonable for an old Ford or even Ferrari, but not for thousands of pristine 911's. I am hoping there is a supplier somewhere in the world for fresh, correct gaskets for a 40 IDA 3C body gaskets.
Has anyone rebuilt a 40 IDA 3C lately?
thanks
Craig

I have rebuild kits from our Host. I can let you know next week if those are wavy. I would call Tom at Pelican in the morning and ask him to look at the kit he has.

Regards,

Hi BReyes, The "new", dimensionally off gasket i have is perfectly flat.
If i were to wet it, it would have to selectively grow in some areas, selectively shrink in other areas and the holes would have to migrate to other locations. i am pretty sure that would not happen.
The kit I have recently purchased did not come from Pelican, but as i said, i can see this defective gasket pictured at multiple Weber kit supplier sites. In fact i would guess that any kit that had GUAMOtorV paper for this particular gasket (not other gaskets) is going to be unacceptable. It is not like this gasket is just a little off, needing a little tweaking.................. the throat bores, jet holes, bolt pattern, etc are all off.
If lined up one throat, the third is 1/8" off.
i would be great if you took a look at what you have and let me know. I also would like to know exactly what the new kit you have consists of........i realize it probably has orings, copper rings, and fiber rings of some count........... but if you have calipers and little time, can you inventory what you have exactly? is there a list included with the kit to assist you in determining where each goes? please check my referenced page for what i find for dimensions for an OEM Weber 40 IDA 3C.
Thanks for your time and comments on this.

I am traveling on business presently, and was planning a weekend for a get away, and will not be back to the garage. I will let you know what I have, and you can pm me with your telephone no.

Regards,

Sorry, been gone to Hershey. I picked up a Weber manual on 40 IDA 3C-40 IDS 3C-46 IDA 3C. i have not found a good copy posted on the web. i will try and pdf this to the Weber page i now have for this subject.
http://www.huskyclub.com/Porsche40IDA3CWeber.html http://forums.pelicanparts.com/uploa...1160244392.jpg
I hope you can get a measure on any gaskets you receive within a "kit".
thanks
Craig

is it possible that someone can supply full size copies of the Porsche Weber parts diagram for the period? I see a small 40 IDS 3C pictured in a previous post, too small to do a part number review. would there be a 40 IDT 3C ? There are plenty of 40 IDA 3C sheets available, but i am specific for the period sheets for 40 IDS 3C and 40 IDT 3C.
i would be glad to post, or open for suggestions...
thankshttp://forums.pelicanparts.com/uploa...1160311901.jpg

I just rebuilt a pair of IDS 40's and had the gasket issue you have. My original gaskets were still ok so I was able to reuse them. (the carbs had been rebuilt 20 years ago with very little miles on them after) Unfortunately the previous owner parked the car in a barn and just left it there .... the Carbs were a mess, full of resin and the brass bits had become brittle .... anyway after some TLC and some chemical experiments they came out Ok. The only issue I have right now is the O ring # 43 on your diagram either distorts or get sucked into the brass washer # 37. I am running them without the O ring ... Probably not a good idea.

67rebuild, i added some dimensions to my Weber page that i feel are correct. you might want to be sure all dimensions are fine. most likely you need some grease to lube the external spring, brass washer, oring.
But it could be incorrect size oring, or worn out brass washer. I understand there may be a "cup washer" to improve on the oem flat style.
Anyone aware of this?
make sure your spring is correct and not too long causing undo force on the oring.

back to the gasket and kit question - can you tell me where the kit came from so i can avoid purchasing it? were any of the other kit pieces understandable and correct? if float needle valves were supplied, were they marked as to size?

thanks for your help[IMG]Idle mix screw[/IMG] http://forums.pelicanparts.com/uploa...1160655814.jpg

p400,
Thanks for the info ...very helpfull ... it looked like the spring pressure was too great, I'll check it out the cup washer as well.
As far as the kit I used it seems to be a 'home made' bag of goodies.
the float valves were included ... 175 was the number on them ... not sure if that is the correct one for my application though.

Regards ...

I've used our rebuild kits on my own carbs with no problems. Nor have I heard of any of our kits coming back for return. Perhaps you just got a bad kit?

-Wayne

Wayne,
It wasn't one of your kits ... I got it from a local (Toronto Canada) guy. The kit it self actually was very complete, it just didn't have a label on it (that I noticed any way). My issue with it was the gasket (same one as P400) didn't fit well.
Regards ...

Porsche Weber 1973 IPBs
 

Hi group, i have added the exploded views for Porsche Webers 40 IDA 3C and 40 IDT 3C from a 1973 BAP/GEON catalog i got off E-bay. It is at the bottom of my ongoing weber page at -
Porsche Webers
I hope this 1973 information will add to your data in maintaining these Weber carbs.
I am still looking for feedback on these main gaskets for Weber 3C. I cant believe i am the only one to experience the non-fitting gaskets.
Thanks for any help on this. i hope these pdfs will help too.
Craig

Webers -lots of different types huh?

I just stopped by Nort Northam and had the opportunity to check out a little 308's Webers. It was four assemblies probably a couple floats each.

I also just spoke with Don at Zotz.

The bead blasting that they do is inside the carbs, so look inside yours and for example, any corrosion in the floats can be bead blasted.

Is the problemn that you are having: that the gasket does not drop right over the studs? Having just re-built a set, I noticed the gasket was difficult, until it passed-by the threads on the studs.

Hi shbop, No its not a matter of forcing it over the studs, which can be done! Once you have done this, it actually appears that that the gasket might work, but what has really happened is the fit at each hole, throat, curve, whatever is compromised , not just slightly ... some holes are covered, ...actually too many fit problems to waste time with. Yes, i want a gasket that fits and I think everyone would.

My point is, i feel the Weber dealers are being supplied a kit, from Italy, i am sure in good faith, with a miscut gasket in this 3C application. I could be wrong.

i guess you were happy with the finished fit of your gasket? was it a Guamotor V gasket as i pictured? what about the other items supplied in the kit? were they good replacements for what you needed? same size? material? was everything you expected in the kit?

I'm sorry I don't recall the brand of the kit. I was happy with the overall kit. I was a bit frustrated, at first, when I had so much difficulty with the gasket passing by the studs. Other than that, everything seemed fine. I'm about to re-build another set. When I receive those kits, I'll let you know the brand

David, the kits I've been using are by Rayze.

would that be -
Royze
i see they have functional, crude website for parts. No prices. Did you order by phone, web or ? thru another source?
thank you

I got my kits from a local supplier. I believe they order from SSF in Calif.

Richard at PMO Weber stuff you could possibly use.

http://forums.pelicanparts.com/pmocarb.com

Rebuilding a pair of Weber 40 IDA 3Cs with a Redline kit purchased from Pelican. The main gaskets do not fit. I tried coaxing, stretching a bit. The gasket tore around two of the eight bolts and two of holes were still not on the bolts. This was on the first kit. I took out the gasket from the second kit just to see if it was any better. Identical. Laid them over the one that I took off carb and it confirmed. The holes are off enough to confirm the poor fit. I don't like the idea of soaking them just to get them on. I'll call Pelican on Monday. But I'm just wondering if anyone has any more recent information on a good source for the right gasket? I could cut my own, but that sounds like more work that I want to do. And I'm not comfortable using the one I took off.

PMO
PMO High Performance Porsche 911 Carburetors & EFI & MFI Fuel Injection Kits

Thanks for the link Henry. I don't see any rebuild kits or gaskets on the website. Are those sold only through dealers?

911 Vintage Parts can probably source them through PMO for you if Richard is nor so inclined.
Ken 911vintage@earthlink.net
760-731-4911

PMO distributor with a shopping cart, fast shipping. I had no problems with their gasket set.
Weber Carb Parts

Thanks Henry

Gaskets
 

Rebuilt the 40IDF carbs on my VW motor with Redline gaskets. They fit well when installed, but after a year or two they had shrunk into the air horns.
Maybe soaking in WD40 would be a good idea to keep them from drying out.
Bob B

http://i197.photobucket.com/albums/a...ps43ca482a.jpg

We make Weber, Zenith and Solex gaskets from Klinger materials.

We use Klingersil C4400 for fuel resistant gaskets and Klingerstatite for all of the 'air' side gaskets.

We have diaphragms made from an Ethanol resistant Contiflex material and we are just completing the O rings and 'thin' copper sealing washers.

We have made thermal insulators that fit between carbs and manifolds with suitable studs.

http://i197.photobucket.com/albums/a...pshahfrlqw.jpg

We have the correct hardware in terms of the relevant reduced AF Nuts for all of the carbs and the correct studs for the carb bodies.

We also have the correct metric nylocs with a 'white' insert and Cheese head screws that watch the profile of those used on Solex and Zenith Carbs

http://i197.photobucket.com/albums/a...psmhc1nhts.jpg

http://i197.photobucket.com/albums/a...pskjb970uq.jpg

Redline gaskets
 

My local shop (which I like to support) likes the Redline kits because of the accelerator pump gaskets (which were a good fit). So I took their advice and had them order me two rebuild kits.

The paper carb top gaskets were terrible...just terrible. I called and spoke to some tech guy at Redline who claimed to have never heard of the problem. I asked about soaking the gasket and he suggested against it. Guy was pretty much an idiot. Told me to remove all the studs from the base :eek: and then use an awl to stretch the gasket while reinstalling the studs. Stretch a gasket while holding it down with two hands while I use my third hand with an awl to open the holes wider and then using my forth hand to reinstall the studs one at a time??? Sure...get right on it.

I am going to use a good old ring-binder paper hole punch to "oval the holes on both ends of the gasket. Holes in the center of the gasket look to be workable. Stretching the gasket will likely rip it...hole punch will put the holes where the studs want them...and most likely allow me to remove the gaskets without tearing them in the future.

In the meantime I am rubbing "rapid-grow" fertilizer daily on my shoulders to get those other two arms to grow... :D

I'd suggest spraying the PMO gaskets with a gasket sealant/dressing spray because i've seen a number of PMO carbs with unfortunate weeping leakage from the top covers. The fuel leakage runs down the carb body and stains it brown. Dressing the gasket is easy insurance to reduce the weeping thru the gaskets.

Most of the 'fibre' gaskets still being used are made with an NBR Binder and these materials suffer as the quanity if Ethanol added to modern gas increases.

We have just started trials of top cover gaskets using a Klinger Top Chem 2000 materila which uses a PTFE binder that should be competely resistant Ehtanol which we belive is the cause of the 'brown' coloured leakage that seems increasingly common.

The worst example of this which we have seen is on a car the lives in France and used E85 fuel..

We believe that these gaskets may solve the problem and we fitted them to the 'French' car about 3 weeks ago and will monitor the results.