Header Tank Caps

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Re: Header Tank Caps

Postby R0B » 13 Jun 2018, 16:26

I don't think there is as i don't think any other vehicle has our system. But beware of buying a similar cap off eBay.I made this mistake thinking i was getting a bargain as no postage. This one had no quack, you could suck and blow through it. Needless to say i returned it pronto.

Is there an "upgraded" cap available, maybe from another model.
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Re: Header Tank Caps

Postby itchyfeet » 13 Jun 2018, 16:42

my money is on the seal degraded by something in the cooling system.
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Re: Header Tank Caps

Postby R0B » 13 Jun 2018, 16:46

It had crossed my mind. But what? Apart from coolant and the remnants of Kseal there is nowt else in there. Maybe it's the local water :?
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Re: Header Tank Caps

Postby itchyfeet » 13 Jun 2018, 16:53

oil perhaps from a previous contamination?
maybe K seal is enough who knows whats in it?
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Re: Header Tank Caps

Postby R0B » 13 Jun 2018, 17:09

Methinks Kseal is the culprit.
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Re: Header Tank Caps

Postby CJH » 13 Jun 2018, 17:38

Rob - what makes you say that it's no good? Is it that it doesn't quack, and that you can blow and suck through the nozzle? I had a new one that was the same, but I realised that the rubber washer that holds the valve in the cap will only seal when it's screwed down onto the bottle. Without that, I think air can get past the washer, and that's more likely I guess when the washer is older and may have shrunk a bit. So as far as I could tell, the suck/blow/quack test isn't conclusive unless you do it in situ, screwed down tight on the bottle. Goes against the common wisdom I know, but now that you've had yours apart, would you agree that it's only the tightness of that washer in the recess that would prevent air passing, but once screwed down the washer will compress and make a seal?
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Re: Header Tank Caps

Postby R0B » 13 Jun 2018, 18:02

Screwing the cap down does not make any difference, i have a spare tank here and have tried that.I can still suck and blow through the cap.
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Re: Header Tank Caps

Postby CJH » 13 Jun 2018, 18:07

Ah, right. No good then.
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Re: Header Tank Caps

Postby Cecil » 14 Jun 2018, 07:47

Thanks silverbullet. yes that’s the book I meant.Thanks for showing it.
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Re: Header Tank Caps

Postby Cecil » 14 Jun 2018, 10:11

After 1years use The Blau cap I dismantled took considerable force to lever apart and traces of blue plastic were left on the black plastic and vice versa. Of the 2 other new unused Blau caps I bought (at the same time ) one has the black part secure and the other loose.Of the 2 (certain vintage) genuine vw caps I have the black part is secure on both.
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Re: Header Tank Caps

Postby R0B » 14 Jun 2018, 11:36

Do your secure and loose ones quack?
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Re: Header Tank Caps

Postby Cecil » 14 Jun 2018, 13:55

Yes The new one with loose black part quacks.
The one I prised apart now quacks ,having dismantled and cleaned its valve ,the black part is now loose fitting!
The others quack except the vw original which is why I have removed it.
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Re: Header Tank Caps

Postby lefty67 » 18 Jun 2018, 22:00

Apparently vw stopped supplying/manufacturing the black caps in December 2017,
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