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Hi all. I purchased a used intake some time back for my ‘89 S4 rebuild project. I’m finally working with it, attempting to remove the bonded rubber buffer studs (fuel rail support studs). I received the manifold with the 4 studs in place but minus the actual rubber buffers, so I’m installing new ones. My question: are these known to be difficult to remove? I’ve sprayed them with PB Blaster and have the double nuts on them (tried 2 so far) but they’re not budging.
Hold your fire here. The rubber studs disappeared before 89 and the fuel rail support studs are attached directly to the manifold, as pictured.
The fuel rail legs were changed too to accomodate this change, so if you add the bonded rubber studs as shown in the PET, you'll find your rails don't fit. There are threads around about the difference - I ran into the same many years ago.
So the 87-91 PET has the picture and part (the rubber buffer) incorrect it sounds like. good to know, and thanks, I did not have a disassembly pic of this unfortunately.
The early S4 fuel rails had the mounting tabs up higher to allow for the rubber isolators. The later rails have the tabs low, and no rubber sound isolators are fitted. The rails and mounting methods are not interchangeable.
03-08-2020, 08:15 PM
Bonded rubber buffer stud removal
