Pipe/cable near right-side cam cover

[Marcusu]

Hi all,
Could someone please let me what the pipe/cable with the white plastic wrapping around it and the back of the right side cam cover in the top photo does?
Reason I ask is that I’ve noticed it’s missing since I had some engine work done by a specialist on it recently and I’ve noticed it’s not there now.
It is a 1972 New Zealand spec car so I assume it’s the same as UK spec.
Many thanks,
Marcus

[Craig Balzer]

That is the thermostatic valve whose main purpose is emission control.

There are early and late versions and minor differences whether your car has a manual or auto transmission.

It is shown in the upper right corner of this page from SNG Barratt's
https://www.sngbarratt.com/English/us/F ... mbly/18158

As yours sits now, you have one or more vacuum leaks; the various ports are activated by engine temp and -- I think -- RPM.

I would ensure your "specialist" replaces the vacuum lines as original.

These may help

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I replaced mine with a housing from a 1971 V12

[Marcusu]

Thanks for your reply Craig.
Strangely my car has been running really well in the couple of months I’ve have it back from the specialist, it’s only since yesterday I’ve noticed the rough running and unevenness under acceleration.
I’m not sure what would explain that other than the change in temperature and humidity with the change of season, or a problem elsewhere?
Cheers, Marcus