8Lug

Important info. It appears there may be two versions of this switch.
I had my car on the lift today, detailing it for an upcoming concours, and decided that since I had the undertrays off for cleaning and the FAL already exposed, I would proactively swap out my switch for the new one received from the group buy. I unscrewed the old switch and compared it to the new one, and it turns out that the threaded sections which screw into the valve body are different sizes. See pics below. The one on my car was the smaller thread size. The one from the group buy is the larger.





Just so there is no doubt that I pulled out the right switch, here is a pic while still on the car.


And finally, this may confirm that the two part numbers listed for this switch may correspond to different thread sizes.




I know some guys missed the group buy. If you're confident your car has the switch with the larger threads, I'm happy to send you mine for the same price I paid for it.

MJFDDS

Oh no. 8Lug, is your car a ‘10 or ‘11 MY?

8Lug

2010

JB911

My car is 2011 and the switch was correct-and the new switch has the part number engraved on it-
So it looks like there was an older switch in the first few FALs
We'd have to check the Suco catalog and see if they make the switch with smaller thread and if they are available-
Let me look for the catalog and see-

8Lug

I found pics of the 13 bar switches sold by Porsche.
This is part # 997-341-964
You can see the threads are smaller and the washer has a built in rubber inner. This is what my 2010 has.



And here is part # 997-341-967 which superseded the earlier part. Notice the larger threads and washer with no rubber inner.



JB, if you can look in that catalog to see if there is a replacement for the ...964 part # that would be much appreciated.
FYI: my switch (964) is stamped with "405903" which is the same # you can see stamped on the latter switch (967) above, so it appears that from the factory, both versions were stamped with the same Suco part number even though they are different.

JB911

Here's the catalog:
https://sucoesi.com/products/mechani...n-socket-0140/





From much earlier in the thread:
0140-45903-2-009. Porsche Part # 997 341 967 90
So maybe yours is the 1/8" one ending in -302(?)

The thing to do now is to confirm if it is, and this means others that might have the earlier model will need the other switch 🫤
There are other threads on the 997 GT2 GT3 section about the FAL failures-I directed them to this thread since this is the one with most info. I did receive a few PMs after the order was placed, so indeed there are some owners that would need a switch. Some bought 2 switches, and one bought 3.
So now everyone has to see if their switch is the correct one, and it looks like the only way to confirm is by taking out the old one 😑
It will take patience to gather how many early switches would have to be ordered, and I assume the small thread one should be available-the good thing is that the minimum order is only 5-

The new switch functions so well, I'm sure those who have to remediate this will tolerate the headache of waiting. Some might want to buy an extra one from members that don't need the large thread model, since they are already here and the USPS is only $10.20 with shipping box included.

The other option would be to re-threaed the base to the larger size. This would have to be done by a competent machinist-
I would think the switch was upgraded to the larger thread because 188 ponds of pressure is quite a lot.

Best,
John

JB911

The rubber with the two little holes is for the wires, to seal in the plastic cover-It came with the new switches and was included-
*I did tell Eric the manager that there would most likely be another order soon, so it looks like the new one would be of the smaller threaded one. But suco part number has to be confirmed-
JB

8Lug

Are the Suco part numbers above the only ones listed in the catalog for this switch? It’s not NPT thread and 1/8 NPT is over .4” outside thread diameter so that would not work.
1/8 BSPP is .382” which is what I measured but I don’t see that listed as a size option.

JB911

Yes, that's a screen shot of the switches, from the catalog. The complete catalog is on the link I posted. 10-20 Bar(they adjust them to 13 Bar before shipping). Those are the threads available
A thread gauge would be needed to confirm which one yours is-

8Lug

NPT is a tapered thread so it’s definitely not that. I don’t see any other options listed that would match a .382” outside male thread size. Bummer.

JB911

I went to page 23 on this discussion:
>>I am not aware of anyone ordering the 964.90 version of this switch.<<

I'll do a search for the Porsche part number and see what the Suco equivalent is.
Very sorry you have this headache-

* I just saw this:
997 341 964 90 - pressure switch until pump

997 341 967 90 - pressure switch from pump

997 341 963 90 - pressure switch

So 964 90 is a different function, not the 13 bar one(?)
What you need is the 13 Bar with smaller thread size, and we need to determine the exact size of that thread, and Suco part number-
Will search some more
JB

8Lug

JB don’t be sorry. You’ve done nothing but help. My FAL still works fine with the original switch so this is just a hiccup in my preventative maintenance plan. I’m sharing all this info to hopefully help others who may have the first version of this switch. If we can get the right part from Suco that will be great. Otherwise it’s still available from Porsche for $350. Sucks to pay 7 times more but at the end of the day it’s not a big deal.

8Lug

963 is the low pressure switch
964 is the first version of the 13 bar switch
967 is the second version (larger thread) of the 13 bar switch

JB911

Ok, I saw that Bovien wrote, post #145:
997 341 964 90 is for pump until 000 111
997 341 967 90 is for pump from 000 112

It appears to be the 964 90 with smaller thread. The complete info is "until pump" 000 111 or 000 112, meaning the system changed to a different pump. The easiest way is indeed taking off the old switch or try to identify the serial number of your complete system. Easier removing the switch, I guess. But still, trying to find the Suco serial equivalent to 997 341 964 90

JB911

Also, on page 11, Bovien wrote:

In my case, there was several numbers on the compressor, non of them even closely resembled the syntax of what the doc describes is needed to order the switch. Very strange. My FAL system looks untouched and as new, and no stickers looks to be missing.
The difference between the two switches available are - according to Porsche - the male thread that it mounts on the FAL system with. There is apparently a 1/8" and an 1/4". I looked at the numbers on the switch itself (stamped on the side, but maybe not possible to see without removal of the system), and cross checked with suco (https://www.suco.de/en/pressure-moni...hes/m4/f1/146/). It gave me the info that mine had a thread called 'G 1/4' or the likes. So I just gambled as I was pressed for time to get the part home. Measuring the thread i have 12mm and a M12 nut fits over it (which in my mind makes no sense with 1/4", but hey, it fit.


He hasn't posted in a long time, a direct PM might be needed to confirm the Suco part number-
But I'm still not sure if he means he got the small threat 964 90 version(?)