At 10:25 AM 8/31/2008, you wrote:
>at the moment there's no overheating. When I start the engine and
let it get
>warmer in idle than it doesn't 5 min. to pressurize the cooling
system that the
>resevoir gets smog in it with some bubbles and the radiator starts to leak.
>The tube from the engine to the radiator gets so hard that you are
not able to
>compress it by hand.
Sven,
I've never seen that. My guess would be possibly a pressure build up from some
thing.
>Probably it is not one of gaskets, because they have been changed just a few
>weeks ago,
Was the head torqued correctly? Was it retorqued after the engine had been
run a little and brought up to temp?
>but the whole head could be bent. Or a crack in the lower section of the
>enigine block??!
It's possible that a head is bent (warped). You'd have to pull then
and replace
the head gaskets. Did you have the heads "decked", shaved to make sure they
were flat?
>In my understanding a compression-check could only find leak which
are visible
>in cold and warm state. But you want to find something with this
test when it is
>only when the engine is hot??
A compression check will check the integrety of the cylinders. If
all cylinders
come up to about the same pressure, the everything is fine. If not, then
there is something wrong inside the cylinders. So then you want to squirt
about a tablespoon of oil into a cylinder that reads low pressure, and then
check the compression again.
If compression comes up, them the rings are worn and not seating correctly, as
the oil you just put in the spark plug hole will help seal the rings.
If the compression does NOT come up, then you either have a problem with
the valves, a burned or sticking open valve, or a blown head gasket. Either
way you have to pull the head to see what is up.
As to a hole in the water jacket in the block, that would cause a
loss of fluid,
either into the pan or onto the ground. It really would not cause
pressure build
up in the cooling system. Because below the pistions is basically open to the
atmosphere, via the PCV valve or the breather tube (in real old engines).
What does you oil look like? Is it a milky brown and foamy, or is it
pretty clear and smooth?
Also like someone else asked, what do your spark plugs look
like? Any of them wet, or a large whiteish deposit?
John
John T. Blair WA4OHZ email: jblair1948@cox.net
Va. Beach, Va
Phone: (757) 495-8229
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