Mrmerlin

I would not be sanding the injector intake mounts while its installed on the engine as the sanding grit will fall directly into the cylinder thus damaging the bores

hacker-pschorr

As Merlin pointed out, Dow Corning 111 is the way to go, lube up the rings.

Another idea, take the injectors out of the rail and install them one by one in the intake, but lube up the o-rings first.

Bertrand Daoust

+1.
Don't sand anything with the intake in place.
I would remove the intake to do anything like this.

I used a bit of motor oil on every O rings there. Worked perfectly for me.

Chalkboss

I too used a very slight film of motor oil, as I figured with all the oil ingestion issues on these motors how could this hurt? I found with new o-rings the injectors fit in snug but no extra force or persuasion needed. If the intake was painted I would think this slight layer would cause them not to go in. I was paranoid about dropping things in the holes after reading horror stories here, be sure to follow the advice of the pros ...

SeanR

Agreed, that's one of the most asinine things I've seen posted here.

I lube up the o-rings, put in place and use a small block of wood and a tap hammer to get them in place. No harm done and been doing it that way for 8 years personally, watched the wrenches at my fathers place doing 30 years ago.

Sanding **** in to the valves? Really?

hacker-pschorr

It helps clean off the carbon.......

awilli6

Ok, I'm stumped! The injectors will go into the holes on their own but when they are connected to the fuel rail they are too far away from the holes and they don't line up with the FPR or FPD or the lines in the front.

Is it possible that the intake mounting studs are to thick? Those in addition to the new intake gasket has the injectors a few mm to high. Any additional help would be appreciated.

Bertrand Daoust

Did you change anything?

Fuel rail?
Studs?

Can you post pics of the fuel rails, intake please...?

Something's not right for sure!

UpFixenDerPorsche

I think you'll be pleasantly surprised Awilli6. My intake refresh on the S4 was my first serious foray around the engine and I was terrified I had done something irreparable. My sense of reilef was off the scale when I found the problem was just the thickness of the paint.

Hilton

Are you using the same fuel rails which came off the car? (87 and 88+ rails have different length legs, with later being taller)

UpFixenDerPorsche

Haww golly gosh Pa. Dat must be Y dat ole enjun o' mine blew riiiiiight up de next week. Ha-yuk ha-yuk ha-yuk.

Gosh geeee thank youse all fer that lil' tip. Ya git learned sumthin' ever day on here.

You tossers.

ROG100

This is the difference between an 87 with rubber buffers under the rails or a later 87+ where they just bolt directly to the manifold.

UpFixenDerPorsche

...

UpFixenDerPorsche

Gee Merlin, isn't that concept self evident?

I'm sorta gobsmacked that removing the manifold should need mentioning.

Even if it does mean disconnecting all that fiddly stuff underneath.

ROG100

This is the difference between an 87 with rubber buffers under the rails or a later 87+ where they just bolt directly to the manifold.