Cracked head somewhere...

[toseland]

so i am leaning more and more to a small crack opening up in my cylinder head somewhere...


inflated coolant lines (hard but not too hard) and when reved i get foam in me coolant expansion tank




however, how much cavitation does the pump cause as its coming from the return line from the pump and is most apparent when its hot (only when its hot) and the thermostat is open...


any ideas?

i am guessing someone could have a poke at pugfest and identify it for me/confirm or deny my fears so to speak.

[londondan86]

Any other head symptoms, high running temps, using coolant, mayo, etc.

[toseland]

Nope, lol, hence i asked about the cavitation..

although not accurate by any stretch of the imagination, the coolant guage sits bang middle of the range as normal..

[Piggy]

HG failure could do that.

have you had the gasses in the coolant sniffed?

When you give it a good boosted drive, does it not get hot then?....heaters working ok? Not losing coolant?

[Ruan]

Probably HG failure - just like mine was, XUDs rarely mayo their oil/coolant unless they're very severe.

[toseland]

HEad gasket is new, brand new.. and VR one as well.. 3+1+1 repair gasket, head skimmed, sorted..

[mr_fish]

didn't you just re-torque and drash on ruan?

[Piggy]

HEad gasket is new, brand new.. and VR one as well.. 3+1+1 repair gasket, head skimmed, sorted..

did you have the same symptoms before?

If it was skimmed, it should have been pressure tested

[toseland]

It was Mr Piggy... it came back fine, no loss on any cylinder and the bores all looked pristine (still see the hone marks)

i had a gas test done on the header tank today.. nothing in the way of exhaust gases present... he was drawing through the blue liquid for a few minutes whilst reving and also whilst idling..

so the bubbles must be cavitation in the pump, and/or just turbulance in the pot itself.. i am at a loss to explain the inflated hoses tho.. maybe the header tank cap is a little too tight?

[londondan86]

Any loss of coolant at all? And when you say temp sits in the middle of the range does that mean 90*??

[Anton]

Sounds very much like my ZX. Unexplainable after 2 years and 60 odd thousand miles

[zx_volcane]

Ahhh yeah Anton's mystery Zx, throwing up its water, never got to the bottom of that

[Piggy]

My unc had a xantia that did that.

Had head done twice, tested and tested. Found some info that a spate of heads werent much cop. You can find them by the code on the head. Code is the drill holes, or lack of, above the glow plugs. Cant remember what number the dodgy head batch was though