86 Euro 16v. Just taken off the water bridge as it was a possible suspect for a coolant leak (I don't think it was the problem.)

I had ordered the paper type gaskets for bridge to heads, as indicated by PET. But I find the in fact my water bridge has the "O" rings in grooves on the bridge with no paper gaskets.

So do I assemble with the new gaskets, or just reassemble with the older O rings plus perhaps a snear of Hynolar Blue ?

Any suggestions welcome, I need to get it back together on Saturday.

 

Are the O rings oem John? If they are then the paper gaskets probably wont work so given the deadline reuse the old with a smear of gasket maker.

 

On the later car they where used in combination from the factory.

Mine where like that when I recently (first time ever) removed/replaced them.

I have gone back with booth and it has worked just fine.


In this thread https://rennlist.com/forums/928-foru...completed.html

post #34 last picture you can see on the left hand side the paper is still covering the o-ring

 

Thanks Malcolm for the quick reply. I believe the O rings are OEM. I was somewhat put off re-using the old O rings by this thread...

https://rennlist.com/forums/928-foru...bo-to-use.html

How about retaining the O rings plus the gaskets ? I assume the O rings would just compress against the gasket to give a second chance at a seal ?

 

Thanks Herman ! I wil try that combination...

 

New gaskets and O-ring. I just put mine back together; I will know this weekend, something, but I'll probably only get to do a short shake down drive. Re the side gaskets, it has a very slightly raised formation on the head that meets the gasket. It is less than uniform and not one of Porsche's better moments; in some areas it is next to flat. The rubber gasket is thin and protrudes at most 1-2 milimeters above the surface of the bridge. It had no paper gasket; I used silicon sealant on the outer edge, trying to keep it from contacting the rubber gasket. But as it always seems in these applications, it is impossible to place the bridge straight down into position. The oil filler neck makes you slide it into position and turn/twist at the same time, I'm sure the bead of silicone is buggered in places. I do think the leak was from the larger center pipe O-ring, which was very hard. But the thin, outer gaskets worry me.

 

Thanks Steve. I does seem a bit tricky to get the bridge back in place with it being tangled with the Oil filler assembly. I will leave the oil filler assembly bolts loose while I try to manoever the bridge back into place. I intend to use a smear of Hylomar Blue as well.

 

Interesting............my 88 S4 didnt have paper gaskets so when I did the intake R&R I also did the water bridge/tstat etc and replaced only the Orings......I didnt know any different..........just when you think you've a handle on theses cars theres always something new

 

Malcolm and Jon - this thread covers it

https://rennlist.com/forums/928-foru...e-gaskets.html

In the absence of new o-rings, I'd go with a new gasket.

 

Thanks Hilton, I knew there was a recent thread on the topc somewhere, but search didn't find it.

Although mine is an early engine I'll try gaskets plus the old O rings...

 

Same here with my 1988. I used only the o-rings but I have a small leak (only 1-2 drops when the engine is cooling down) so I will use the gaskets when I'll do the next coolant flush

 

Well, had an exciting day - fitted everything, poured in the coolant and then heard it splashing out on the floor :-(

What a klutz !! One of the bridge gaskets had slipped down at one end (clear of bolt hole) and I never noticed. Impressive flow of coolant..... it was held with a smear of Hylomar but I must have disturbed it when refitting the water bridge. I found it very hard to get the water bridge outlet into the block with the new seal on it. That's my excuse.....

After a struggle and lots of help from Adrian 928 we lifted the bridge far enough to push the gasket into place. Now the coolant stays in :-)

 

Glad to hear you to got it under control. I did mine with the oil filler neck out of the way and that made it easy.

With the paper gasket in place you'll have a much better seal in the long run

 

Thanks Herman. That's good to know. Although like all these tasks it would be much quicker next time...

The only way to get the oil filler/seperator out of the way on my 16v would be to remove at least the plenum to be able to release the pipe from it that drains back to the sump which runs under the water bridge.

 

Just a FYI - the gaskets used on the later 16v 84/85/86 cars use a thick red silicone gasket that installs into the groove in the water bridge. Much thicker than the 87 plus red gaskets.
Part number is 928 106 197 03 and no longer available. I acquired an original and had replicas made and they are $5 each.