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[TheBoy]

Off with it's head  

Or break it

[JamesV6CDX]

Off with it's head  

Or break it

That would be so sad...

if you're comtemplating breaking it though, then you could always take the head off for a peek anyway....

[sassanach]

the temperature guage may say 95c but for the sensor to work it has to be immersed in water,it is quite likely that the water left quite early in your thrash.at the risk of being flamed my money is on a cracked head .head gaskets do not fix thenselves temporarily but cracked heads do by virtue of the fact that alloy expands and contracts with heat ,either way off with its head AND pressure check it

[JamesV6CDX]

the temperature guage may say 95c but for the sensor to work it has to be immersed in water,it is quite likely that the water left quite early in your thrash.at the risk of being flamed my money is on a cracked head .head gaskets do not fix thenselves temporarily but cracked heads do by virtue of the fact that alloy expands and contracts with heat ,either way off with its head AND pressure check it

Makes sense....

[TheBoy]

the temperature guage may say 95c but for the sensor to work it has to be immersed in water,it is quite likely that the water left quite early in your thrash.at the risk of being flamed my money is on a cracked head .head gaskets do not fix thenselves temporarily but cracked heads do by virtue of the fact that alloy expands and contracts with heat ,either way off with its head AND pressure check it

Cracked head is what I have been expecting for some time...   ...hence why not wanting to do head until I can source a new one cheaply.  And why breaking is being considered an option.

[sassanach]

sometimes the crack can be welded successfully

[TheBoy]

sometimes the crack can be welded successfully

Would the crack be obvious?

[JamesV6CDX]

sometimes the crack can be welded successfully

Would the crack be obvious?

Depends entirely where it's cracked  :-/

[sassanach]

not familiar with that lump. on the 525 series they tend to crack through the cam carrier,but the point is you won,t know until you remove it.

[JamesV6CDX]

I once had a head skimmed once, and the guy made a whoopsie. He scored a huuuge hole in the mating surface!

He was able to fill it, and get it nearly good as new though.

[Kevin Wood]

Cracked head is my suspicion too. I think a head gasket would have deteriorated into a steaming, lifeless lump by the side of the road with repeated driving. The way the symptoms are not getting any worse makes me think it's something a little more solid than the gasket that's got a hole in  

Kevin

[TheBoy]

Though, if the head cracked in such a way the cylinder pressure was getting to coolant, surely you would smell fumes?

Also, with cap off, revving the nuts off it would cause coolant to shoot out of expansion bottle?

[TheBoy]

Every time I think about it, I begin to think its can't be. Surely any such fault would have a noticible effect on running??

[Kevin Wood]

Surely any such fault would have a noticible effect on running??

I hear what you're saying however if the leak is minor enough that it doesn't cause a problem until you give it a good spanking the evidence would probably not appear unless the engine is under sufficient load, and revving in neutral is not going to put it under load (i.e. high cylinder pressures).

I would give it a good thrash, pull in at an MOT station and get them to test the gas in the expansion tank as soon as the lid is removed. There will be exhaust fumes in there if it's some sort of leak into the water jacket.

It's still speculation but you've covered everything external to the engine itself. :-/

At least if you found fumes in the expansion tank it would be confirmation that you need to bite the bullet and have a look inside.

Kevin

[The Barge Captain]

This one blew its load whilst in use, not when stopped...

Ohh er Missus