Kriss
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| posted on 22/6/10 at 12:07 PM |
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Alloy Header Tank Cap - pic inside
All,
My crappy motor factors cap keeps failing every copuple of months. I think the metal on plastic combo along with the rough edge of the tank is not
doing the cap any favours.
I am after a Alloy one which can take the pressure and stop failing.
To suit the below application
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Bluemoon
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| posted on 22/6/10 at 01:22 PM |
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I think you need to say what you mean by failing, it is a pressure cap so will leak when need..
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Kriss
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| posted on 22/6/10 at 01:33 PM |
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failing under pressure at the seal or the actual screw thread.
Just want a decent alloy or billet one.
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blakep82
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| posted on 22/6/10 at 02:01 PM |
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the thread shouldn't be failing, its got all sorts of springs and stuff inside to allow the seal to push up at pressure. so the seal could be
failing, but a alloy one woudn't stop that
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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Bluemoon
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| posted on 22/6/10 at 02:38 PM |
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quote:
Originally posted by Kriss
failing under pressure at the seal or the actual screw thread.
Just want a decent alloy or billet one.
If it's a pressure cap (you can probably get blanks) then it will leak around the thread area as this is the vent path, when over pressure..
I had a problem with an old cap turned out that the thing was leaking when under pressure. Checked operation by adding a valve into the water system
to allow pressure test (foot pump and old inner-tube value), found that the cap opened at the correct pressure but would not re-seal.. New one fixed
this, now opens at correct pressure..
All of this was compounded by a lack of space (i.e. air, in the header-tank) to allow for water expansion, i.e. system would push water out of cap to
reduce system pressure, once system had found it's level it's been fine..
Dan
[Edited on 22/6/10 by Bluemoon]
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Kriss
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| posted on 22/6/10 at 03:34 PM |
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should I maybe drop the water level half an inch?
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blakep82
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| posted on 22/6/10 at 03:48 PM |
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have alook at what Dan said on my thread, which was prompted by yours 
http://www.locostbuilders.co.uk/viewthread.php?tid=138434
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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