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[Marks DTM Calib]

Just skim it, if its measurable using standard kit then its an issue

[Doctor Gollum]

It can't be skimmed. The issue is that no one knows what is an acceptable amount of distortion.

As I understand it, the reason it can't be skimmed is that the head is triangular with the timing cover attached to the block, head and cam covers so any deviation has the potential to make it impossible to reassemble and seal.

[Raeturbo]

What was the main issue with it? Could having the head ringed sort it perhaps.

[Doctor Gollum]

It's been overheated enough to melt the baffle in the water jacket.and the head gasket popped between 2 and 3.

[Viral_Jim]

Surely the cost of testing/machining would get you most of the way to a replacement head, that hasn't been cooked from the inside out 

[STEMO]

It can't be skimmed/machined!

[Doctor Gollum]

Surely the cost of testing/machining would get you most of the way to a replacement head, that hasn't been cooked from the inside out 

£80 to test it, but £2,200 for a new one.

[Sir Tigger KC]

Can you get a second hand head from a breakers? 

[Andy B]

Surely the cost of testing/machining would get you most of the way to a replacement head, that hasn't been cooked from the inside out 

£80 to test it, but £2,200 for a new one.

Christ! 

[Viral_Jim]

I 100% was not suggesting troubling Nissan, or anyone else for a brand spanking new one 👍

[Marks DTM Calib]

It can't be skimmed. The issue is that no one knows what is an acceptable amount of distortion.

As I understand it, the reason it can't be skimmed is that the head is triangular with the timing cover attached to the block, head and cam covers so any deviation has the potential to make it impossible to reassemble and seal.

They will take quite a few thou, they won't have been made to that level of accuracy in the factory and the gaskets and sealant would take up the delta.

[YZ250]

Petrol, possibly '68.

Poor cold starting followed by stalling upto temperature.

Full Nissan history from new.

Recently been in to investigate and found that the thermostat casing had split. Fixed and highlighted a misfire. All plugs found to be heavily fouled and replaced and car returned only to suffer poor starting again.

I suspect that the thermostat housing contains a coolant temp sensor and as the coolant dropped it misonformed the ECU causing it to over or under fuel. Resulting in the non starting and misfiring.

Is the above a reasonable diagnosis?

Three weeks later and the thermostat housing has failed again.

Quote above copied from your original thread.

As my daughter-in-law has a 2019 petrol Qashqai I thought that I'd best look into this. It appears to be more common than it should be, so much so that the thermostat design has been changed. Some that are out of warranty but have suffered the head gasket issue as a result are trying the legal route against Nissan, stating that it must have been a known issue for Nissan to change the stat housing design.

[YZ250]

One source of same issues here. 

https://www.qashqaiforums.co.uk/viewtopic.php?t=13191&start=20

[Doctor Gollum]

One source of same issues here. 

https://www.qashqaiforums.co.uk/viewtopic.php?t=13191&start=20

Apparently Mercedes now fit a bracket to the housing to prevent it separating. Which is the cause of the issue, compounded by a lack of coolant level warning. Which is, er,. suboptimal given that the coolant capacity makes a K series look over filled.

[Doctor Gollum]

I 100% was not suggesting troubling Nissan, or anyone else for a brand spanking new one 👍

Second hand is circa £350/400 and likely to be just as buggered.