Condensation in speedo

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Mjolinor
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Condensation in speedo

Postby Mjolinor » Fri Nov 09, 2018 2:30 pm

I have done everything I can to stop water getting in and nothing works.

I am thinking that the best thing to do now is just to make the mother of all holes in the bottom so that it stays at ambient humidity.

I can't think of any reason why ti may lead to problems so I refer to you lot to point out the error of my ways.

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Re: Condensation in speedo

Postby Tony the Skin » Fri Nov 09, 2018 4:41 pm

It is traditional. My first 90S in 1976 did a bit. My present one does a bit. Less of a problem on the /5 but /6 and /7 commonplace.
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Mjolinor
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Re: Condensation in speedo

Postby Mjolinor » Fri Nov 09, 2018 4:46 pm

If I could still read the dials I would leave it. Occasionally it will form drops and run off so I can see a bit of the dial but not usually where the fingers are. The bottom must have a eggcup full in there, it can't be good for anything.

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Re: Condensation in speedo

Postby Galactic Greyhound » Fri Nov 09, 2018 5:04 pm

Water inside the unit could cause serious problems if it froze during the Winter.

A small hole around 3mm at the lowest point when mounted should allow leakage to drain and some air movement inside the unit.

If a larger hole is made then there is the risk of dust/grit getting inside.

If problems still occur, then a similar sized air-purge hole might be drilled near the top on the high air pressure side of the casing but this comes with the risk of allowing rain entry unless a spigot and tube is used.
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Re: Condensation in speedo

Postby Mjolinor » Fri Nov 09, 2018 5:43 pm

WD40 pipe sized hole and a squirt in there I reckon. That will get the water out and shouldn't do any harm.

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Re: Condensation in speedo

Postby Nate » Fri Nov 09, 2018 5:50 pm

WD40 is a solvent and only really useful for sliding grips onto the handlebars. Use ACF50 - it dispels moisture and is a very good lubricant.

Mjolinor
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Re: Condensation in speedo

Postby Mjolinor » Fri Nov 09, 2018 6:04 pm

WD40 repels moisture and has PTFE in. It's a better choice. I have both (along with at least a dozen others) but I would choose WD40 for this. :)

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keiththeoutfitter1
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Re: Condensation in speedo

Postby keiththeoutfitter1 » Fri Nov 09, 2018 8:43 pm

Didn't BMW actually put a hole in the later instrument casings with a piece of Goretex type material glued over the inside?
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Re: Condensation in speedo

Postby John Marshall » Fri Nov 09, 2018 9:26 pm

I fitted all new gaskets and sealed the outer case with silicone sealant.Then the odomoeter packed up so I had to rip it apart again. Probably best to move to Spain.

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Re: Condensation in speedo

Postby Roy Gavin » Fri Nov 09, 2018 10:22 pm

Or Australia.

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Re: Condensation in speedo

Postby Mjolinor » Fri Nov 09, 2018 10:27 pm

Prefer Greece, I lived there a few years.

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Re: Condensation in speedo

Postby Tony the Skin » Sun Nov 11, 2018 12:22 am

Didn't BMW actually put a hole in the later instrument casings with a piece of Goretex type material glued over the inside?


I know they did that on the later K100 models.
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Re: Condensation in speedo

Postby beemer8 » Sun Nov 11, 2018 5:55 pm

WD40 is a solvent and only really useful for sliding grips onto the handlebars. Use ACF50 - it dispels moisture and is a very good lubricant.
Is the solvent property just a by product ?, always thought that WD stood for water dispellent.

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Re: Condensation in speedo

Postby John Marshall » Sun Nov 11, 2018 8:03 pm



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