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OK, I just posted the following to "Kat&Dougal" re their problem =
"A bit worrying as if the system is pressurising enough to do the things that have happened, the dalek cap should be venting excess pressure into the top up tank (behind the number plate flap - this tank has vents to the outside world at the top).
I had this once and it turned out to be 2 things.
Firstly the thin metal coolant pipe that runs around the lip of the engine bay (on post 85 models) has "T" pieces in it.
On mine, the "T" piece that fed cooling water to the L/H head was totally blocked with crud.
This caused the head to overheat so much that it boiled whatever water was in there causing a big build up of pressure.
The Dalek cap did not vent the pressure and mine kept bursting hoses etc."
Now mine has been OK since then (2 years ago) but during a routine check I discovered that my genuine VW Dalek cap, bought for Brickwerks, was not right.
I could blow & suck the vent pipe in both directions.
As it was a genuine VW one I was a bit miffed.
I ordered another and it just arrived.
This one allows me to blow down the vent pipe, but not suck (as it should be).
Now to the question =
Many of us will be familiar with the older type "radiator cap" that blew off at 13 psi (iirc)
Do our Dalek caps have similar "blow off" system, I suspect they must but would just like confirmation.
Reason I ask is because over the years I have read many posts on here (such as Kat&Dougal's here = http://forum.club8090.co.uk/viewtopic.php?f=37&t=85079" onclick="window.open(this.href);return false; and an older one here = http://forum.club8090.co.uk/viewtopic.p ... 4&start=30" onclick="window.open(this.href);return false; ) where it seems that a build up of pressure from whatever reason has resulted in failed seals / pipes / radiators etc. I would have thought that in these circumstances the cap should "blow off" and vent pressure into coolant into the top up tank ? (making it obvious that there was excess pressure).
Call me paranoid, but I don't want to have this happen to me again and suffer the hassle of blown pipes (or MUCH worse, blown head to case seals
![Evil or Very Mad :evil:](./images/smilies/icon_evil.gif)
It happened once to me 2 years ago and cost me a HUGE amount of hassle and money, culminating in a new engine
![Shocked :shock:](./images/smilies/icon_eek.gif)
Comments invited...