jeff spahn

I did some searching but can't find an answer on this. The gasket behind the thermostat in the water bridge. Do I put this in dry or do I use say Dow 111? I can't find an answer in the WSM, in fact, I only see the earlier water bridge in the WSM on page 19-6

kelanel

i found a pelican thread where mpdano mentions using 100% RTV to keep the gasket steady while lining up the bridge back to the bolts.

Hope this helps: http://forums.pelicanparts.com/porsc...ml#post5576890

jeff spahn

Thanks, but the gasket i speak of is the one made of rubber coated steel that presses in behind the thermostat that most people don't change when they do a thermostat job.

kelanel

correct me if im wrong (which is very possible), but typically rubber/sillicon coated gaskets are designed to fill in imperfections in the mating surfaces making the sealer unnecessary?

jeff spahn

Yes I understand, what I am thinking is does it use something like the Dow 111 silicone, an assembly like lube for rubber items or just put it in dry.

Mrmerlin

Jeff clean out the rear hole in the waterbridge then install the new rear seal dry, it taps in with the correct sized socket
you can use the DC111 on the big O ring it will keep it soft,

NOTE dont use any RTV on the thermostat housing, the reason MPdano used it,
is because he didnt replace the front O ring and it leaked so he added a glob of RTV

GregBBRD

I clean the housing and remove any of the oxidation, like Stan says. I spray the new thermostat seal with a thin coat of HSS3000 (Wurth) and push it in with my thumbs.

HSS is absolutely the best lubricant I have ever found for use with installing seals and 0-rings. It is the most slippery lubricant I've ever seen....by far. I also use it to lubricate things that need a lubricant that penetrates...like the door lock mechanisms inside the doors. It sprays on thin and then thickens as it dries.

I'm not much of a "chemical" guy....I think most products are "modern snake oil", but HSS3000 is absolutely amazing stuff.

ROG100

I'm buying me some HSS3000 - thanks Greg

GregBBRD

THe whole HSS3000 story is pretty funny. I hired on a mechanic, years ago, that said he couldn't work without HSS and that I'd need to get him some. I laughed and said, "yeah, that's no problem"...while thinking "yeah that's not going to happen.....we've got enough stinking lubricants, around here."

So everytime the Wurth salesman came in, the mechanic would ask me if I'd gotten any HSS....I finally got so tired of him asking that I ordered one can. Once I saw what it could do....well, there are cans on every bench. I took a can home and sprayed all the squeaky hinges, in the house....fixed....forever. I use it on the giant "O-ring" on the pool filter...hell, I use it everywhere.

Vilhuer

Is it HSS 3000 or HHS 3000?

borland

I think this is the Wurth product he's referring to... HHS 2000 or HHS-K..

http://www.goodspeedmotoring.com/wur...t-0893106.html

When I renewed the large O-ring on the coolant bridge on my 90' S4, I found a large clump of factory installed silicone grease.

jeff spahn

Ummm, not everywhere I hope. Some lubricants might not be safe for that. I am trying to find it around here. No one seems to have it.

Leon Speed

I know Wurth HHS (HaftscHmierStoff = adhesive lubricant) 2000 and 5000. 2000 is the yellow stuff to be used up to 180C, 5000 is transparant and penetrates more, applications up to 200C. According to the catalogue 2000 is great for hinges, bowden cables, etc., 5000 is good for throttle flaps (!), internal bearings, chains and tensioner pads (!).