Creaking from around windscreen

[graemeho]

Anyone come across this? My 1995 C2 cab has started to creak around the windscreen from pretty much the complete top and bottom of the screen as far as I can hear. The screen was replaced by the previous owner about 3 months ago due to a chip on the drivers side (before I bought it) and there seems to be alot of excess silicon showing on the inside. I've heared that the inner seals can dry out and wondered if a new seal would cure it? The problem has only shown up in the last week which I'm assuming is because the air temp has dropped causing the creaking.

Any help appreciated, screen needs to come out as it's driving me mad!

thanks
Graeme

 

[Gordon Attar]

Windscreen creaking is a common problem in 993's as the screen is not bonded to the surrounding metal (its floating) usually fixed by the application of Teflon tape, to stop the rubbing, worth trying this fix first. The excess silicon is a concern though.

 

[graemeho]

thanks Gordon

didn't appreciate that the screen was supposed to be 'floating' and you say. The screen installer obviously didn't know this either as they effectively seem to have just bonded the screen onto the inner seal from what I can see (judging by the excess sealant that you can see on the inside). Will take it to my local Autoglass for some advise

 

[Mike M]

As Gordon says, very common problem and Teflon tape is the solution, however I think this can be hard to get right. I use (through a recomendation off another site) a Halfords bike chain lube. Cant remember the name but will post tomorrow. I place the nozzel between the rubber seal and the car and gently squirt the lube in running around the window. Let it dry over night and hey presto. May have to do it once, maybe twice a year and takes literaly two minutes!. Costs about £3 and a very easy fix, or go to someone with a 993 window history and get them to apply the tape!

 

[JB 3.2]

ORIGINAL: Mike M

As Gordon says, very common problem and Teflon tape is the solution, however I think this can be hard to get right. I use (through a recomendation off another site) a Halfords bike chain lube. Cant remember the name but will post tomorrow. I place the nozzel between the rubber seal and the car and gently squirt the lube in running around the window. Let it dry over night and hey presto. May have to do it once, maybe twice a year and takes literaly two minutes!. Costs about £3 and a very easy fix, or go to someone with a 993 window history and get them to apply the tape!

Do you apply the lube on the inside of the screen or from the outside?

 

[Mike M]

From the outside. Comes out as a fluid and dries like a wax and acts as a buffer between the rubber and the paint work, which is where the friction noise takes place. Just make sure you wipe excess off which is visible on the paint. Not a problem if you dont just easier to wipe away as a liquid!

 

[pse_SC]

It's called BikeHut, from Halfords[] - a silicon based lubricant which was advised by someone quite a while ago on this forum.
Seems to help.

 

[T911UK]

The screen is bonded in. Otherwise it would fall out! Very common they squeek though, spray some liquid grease, silicon spray, WD40 or a mixture of all under the seal. May need further applications evry 6 months or so

 

[graemeho]

thanks everybody, will see if the lubricant trick works before removing the screen!

 

[JB 3.2]

If the screen is bonded in, is it possible to take it out and refit the same screen back again with new seals?

 

[T911UK]

Yes, if you know what you are doing

 

[JB 3.2]

If the screen is bonded in, is the outer rubber decorative, rather than a seal to prevent water getting in?

 

[D Ward]

ORIGINAL: JB 3.2

If the screen is bonded in, is the outer rubber decorative, rather than a seal to prevent water getting in?

Yes just cosmetic, problem is water lays in the void behind and if the paint and galvanizing has been damaged, which often happens as windscreen fitters are not very careful when they cut the old screen out, which is why a lot of 993s suffer from rusting round the screen.
Best solution is to fill the void with bostic before fitting the outer screen seal, doing that also seems to stop the squiking of the seal and is a better solution than teflon tape

 

[clyde]

ORIGINAL: JB 3.2

If the screen is bonded in, is it possible to take it out and refit the same screen back again with new seals?

No problem at all but unless you want to have an expensive rust problem to fix in a couple of years or so I would try all other solutions to remedy the squeek first, including learning to live with it if you can't cure it. I'm sure there are some guys out there that know what they are doing with these screens but I have never managed to find them, including four or five times when the work was done at a Porsche approved bodyshop.

They will damage the screen surround removing the screen. They will not re-fit the screen properly leaving it squint, too proud of the aperture or too deeply seated in the aperture. Or even a combination of all of the above.

I have had both screens replaced or re-fitted on numerous occasions, twice to repair rust caused by previous fitters cutting the old screen out and not once has the installation been anything like correct.

 

[JB 3.2]

ORIGINAL: Mike M

From the outside. Comes out as a fluid and dries like a wax and acts as a buffer between the rubber and the paint work, which is where the friction noise takes place. Just make sure you wipe excess off which is visible on the paint. Not a problem if you dont just easier to wipe away as a liquid!

Is the lubricant applied between the rubber and bodywork or between rubber and glass?

 

[Gordon Attar]

Maurice

I've come accross a few cars where the gap around the screen has been filled in to prevent the water sitting there and causing the rust issue!

 

[D Ward]

ORIGINAL: Gordon Attar

Maurice

I've come accross a few cars where the gap around the screen has been filled in to prevent the water sitting there and causing the rust issue!

If you look through the porsche technical service bulletins, its all explained in there, the gap is filled with bostic and the front screen outer seal put back in, can be done on the rear screen as well

 

[JB 3.2]

ORIGINAL: D Ward

ORIGINAL: Gordon Attar

Maurice

I've come accross a few cars where the gap around the screen has been filled in to prevent the water sitting there and causing the rust issue!

If you look through the porsche technical service bulletins, its all explained in there, the gap is filled with bostic and the front screen outer seal put back in, can be done on the rear screen as well

Where do we find the service bulletins?

 

[Mike M]

I've filled the back to prevent the water trap, but not with Silicone its a Dow corning product and is Silicone free and is very flexible allowing for seasonal expansion and contraction, as I believe Silicone can attack rubber and it does the job beautifully, havent got around to doing the front yet! The Halfords Bike Lube I mentioned earlier in the message but didnt know the name is BikeHut, but Dry Teflon Lube, not silicone, I raised it historically here quite some time ago.

 

[Mike M]

Sorry forgot to add the liguid really needs to go between the rubber and the paint as thats where the friction point is, if it gets in further towards the window dosent really matter, just waisting the liquid.