Coolant system pressurising but not overheating?!

[D.r.1989]

Thanks for the suggestions. Iv already removed the one way valve from the cap and it made little to no difference. Will report back after a long drive this weekend.

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Ps I have always had old cars, currently have a 72 marina van 75, type 2, 2x87 sj's, 89 merc and the newest shamefully a 98 land rover discovery.

[nominous]

Found the posts & thread I was talking about:

http://www.theywhoshallnotbenamed/forum/...00690.html

Turned out that it might have been a blockage.

FWIW. If I leave mine overnight, it's got ample pressure built up. If started from cold, it's bubbling in the rad - side mount rad cap.
It never overheats. It gets warm on a hard run, but never hits 90C.
heater matrix is bypassed, but with smaller diameter hose as outlined in the westfield XUD project flow research.

I'm not ruling out a HG due to the bypass already having been done with full bore before my adjustment.
Car drives fine tho. Uses a little coolant.

[D.r.1989]

Bit of a delayed reply. Bit fed up with this engine now, Iv fit a vauxhall expansion bottle and left the cap ever so slightly loose to relieve pressure and all has been well! Untill after a week it's lost nearly 2.5 litres of water and antifreeze! No signs of a leak or water being blown out of expansion bottle. Gunna try go over it with a fine tooth comb to see where it's leaking. My sj gives me no trouble what so ever and runs so well, it even averages 40mpg! I really like the xud engine but damn this is testing me!

[r3k1355]

It does sound like it's popped the head gasket mate.

[Mattcheese31]

Head gaskets go on these engines without mixing oil in the coolant and don't overheat until they really go, had it on two cars now

[nominous]

So it'll pressurise, perhaps use some coolant but otherwise it'll look ok?

Still would love to know what the magical mystery fix was in the post I referenced.

[Mattcheese31]

So it'll pressurise, perhaps use some coolant but otherwise it'll look ok?

Still would love to know what the magical mystery fix was in the post I referenced.

exactly that mate.....

[nominous]

fair enough. Worry about it when ARP's go in then

[D.r.1989]

It does sound like it's popped the head gasket mate.

Iv only just done the head gasket and had the head skimmed and pressure tested.

[D.r.1989]

But of a late reply but I suspected block was cracked, changed the bare engine and had no issues what so ever since!
Thanks for all the advice!