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Upon reviewing Dwayne's instructions on an upper intake refresh I noticed that he had rubber mounts for his fuel rails. On mine there were just studs (Shown in the picture). Was this just shoddy work on the PO's part? I also notice them in the PET.
The bonded rubber buffers and the fuel rails that match them were replaced with the studs and different fuel rails before the end of the '87 model year.
No rubber mounts should be present - I was also puzzled by this when doing same job on my previous MY88. It's an error on drawing 107-05. If the rubber buffer was present the injectors wouldn't reach!
Thanks Dave, To make sure that I understand you...No rubber mounts needed?
Based upon what you've reported, yes: no rubber mounts needed.
The proof in the pudding is the location of the lower injector o-rings when the fuel rails are installed and bolted. The lower o-rings should be fully seated in the intake bore. No part of the o-ring should be proud of the intake. But not too-deep.
Remember that injectors should be installed in the fuel rail and clipped, then the assembly installed. Not the opposite or fire!
And always, always, *always* bypass the fuel pump relay to pressure-leak check the fuel system after you have made all the connections.
Originally Posted by StratfordShark
No rubber mounts should be present - I was also puzzled by this when doing same job on my previous MY88. It's an error on drawing 107-05. If the rubber buffer was present the injectors wouldn't reach!
It's not an error for early-to-mid '87s.
As above in my first post: the fuel rails for early-to-mid '87s are different from those post '87. You cannot mix-and-match fuel rails and bonded rubber buffers.
Thanks so much guys. I was ready to order the rubber mounts. Thanks so much for the detail and changes noted in the mounting.
Dave, I will definitely mount the newly purchased remanufactured injectors into the fuel rail first, and have made a jumper with a toggle switch (Incase I have to turn it off in a hurry while observing) for the fuel relay. Bought the DR.'s fuel lines from Roger. I definitely do not want the flames. It is great to have guys like you to help a Newbie like myself. Hopefully someday I will be able to do the same for others.
This car is a late 87 so rubber mounts were not fitted.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
AFAIK the early 87 rubber mounts were replaced with thick aluminium washers. This was to stop the rubber perishing and therefore causing the injector to come loose and cause a fire.
Just thought I'd post this in case someone with an early 87 was reading. If I'm incorrect please let me know.
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931 110 191 00 Bonded Rubber Buffers missing.
George Layton March 2014
