1989porsche928

Hello. Does anyone know how to remove the fuel injector bolts off the S4 intake manifold? I bought new ones. Their is 4 of them and they hold down the fuel injector rails

SeanR

They are nuts, and I use a 1/4" drive with a 10mm socket on it.

1989porsche928

mine are damaged and missing the rubber so I have new ones their like double sided bolts i tried turning the old ones left and it did not work.

1989porsche928

It looks like these bolts are called "studs", I am probably going to have to buy a tool like this:

WallyP

You can usually remove stud with the "double-nut" technique. Run a nut part-way down on the stud, run a second nut down until it touches the first, then tighten the two nuts together. Turn the lower nut to remove the stud.

SeanR

Wait a minute. Take some pictures of what you are doing, there is no rubber between the fuel injection rails and the intake.

Mrmerlin

NOTE use compressed air to blow out the sand from the injector bases prior to removing the injectors.
then use a vacuum cleaner to clean the adjacent areas.

NOTE WD40 sprayed onto the bases of the injectors will make them easier to remove apply this after compressed air

BDR

The double nut method has worked great many times in the past for me.

Rob Edwards

Wait, stop- don't double nut anything just yet....

Is the engine in your '89 original? There some early '87 intakes that had the double-stud rubber isolators to hold the fuel rails to the intake. And the fuel rails are specific to those early intakes .

The intake pictured in the first thread below is an early '87, there are no ribs flanking the flappy bearing hole.

https://rennlist.com/forums/928-foru...-mounting.html

Another discussion:

https://rennlist.com/forums/928-foru...-s4-model.html

Here's a pic DR supplied that illustrates the fuel rail difference (same part number in PET, but NOT the same part!) Early ('87 only) on top vs. '88-95 on the bottom:




If your intake is an '89 and original to the car, there should just be bare studs inserted into the intake, as below. There is _zero_ reason for those studs ever to be removed from the intake.

Hilton

My '87 is early-ish (1986 calendar year) and had the shorter fuel rail legs. However at some point it was modified with studs - possibly when the dealership replaced the engine under warranty (it has a warranty replacement block).

To compensate for the shorter fuel rail legs, they used spacers:







If it has rubber buffers under the studs, then they should be replaced. However, if it has just studs, then definitely leave them there! If you're unlucky, you'll shear one off, and end up drilling, tapping and installing a replacement.

(I did this to my '89 back in '08 )

1989porsche928

thanks. i looked in a eletric catalog and noticed my 89 did not have them.