Air Pump Removal - Exhaust Inlet Thread Size
#1
Pro
Thread Starter
Air Pump Removal - Exhaust Inlet Thread Size
Hi all,
I'm removing the air pump from my 1990 S4. Can anyone please tell me the thread specs. for the connection between the air pump to exhaust small diameter pipe? I think I need to cap off that small inlet pipe to the exhaust as part of this process.
Thanks in advance
I'm removing the air pump from my 1990 S4. Can anyone please tell me the thread specs. for the connection between the air pump to exhaust small diameter pipe? I think I need to cap off that small inlet pipe to the exhaust as part of this process.
Thanks in advance
#2
Nordschleife Master
Dave, its M22 x 1.5 from memory. I'm at the snow in NZ at the moment, but there's a hydraulic cap thats exactly the right size made by Gates. I'm back in Sydney this weekend so can look up the part number then.
I bought the cap a couple of months ago for my newest '87 - my prior 87 I made a cap by welding some steel onto a nut.
I bought the cap a couple of months ago for my newest '87 - my prior 87 I made a cap by welding some steel onto a nut.
#5
Pro
Thread Starter
Thanks Hilton, enjoy the snow and if I don't find one before the weekend I'll be in touch. Now off to the local 'nuts and bolts' shop.
Brian, NAPA? I'm guessing tat'd be "North American..." - I'd have to find a SPPA, that'd be "South Pacific..." :-) :-)
Brian, NAPA? I'm guessing tat'd be "North American..." - I'd have to find a SPPA, that'd be "South Pacific..." :-) :-)
#7
Nordschleife Master
Just ran across the cap I was talking about when digging in my "useful fittings" parts bin.
Here's the one which is an exact fit for blocking off the air supply tube on the factory cats - where they get supply from the air pump diverter valve.
Part no: G64793-0015
Description: 15FDL-CAP
Here's the one which is an exact fit for blocking off the air supply tube on the factory cats - where they get supply from the air pump diverter valve.
Part no: G64793-0015
Description: 15FDL-CAP
Trending Topics
#9
Nordschleife Master
I tried making my own and finally wised up and just had 928I ship me the right ones.
#10
Nordschleife Master
The part I'm talking about is one for which there is no factory equivalent.
Its for the opposite side to item 33 in the attached picture - to seal up the air-inlet on the catalytic converter. Not something you need to do unless you happen to have a non-cat RoW S4 which needs to run with factory cats, due to the way the airpump connections are made on a non-cat RoW car. Dave's OP was because he removed his complete airpump assembly and was left with the open pipe in his exhaust.
e.g. I did this on my '87 as the airpump manifold feeds each individual exhaust port on the heads, so the connection on the cats is redundant - I was required to use cats to pass emissions.
Last edited by Hilton; 08-04-2012 at 11:30 PM.
#11
Nordschleife Master