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[Doctor Gollum]

There may be an argument for doing it whilst you're there, but... If the other pipe hasn't been disturbed during other work, then I would be inclined to leave well alone...

See what Nick and Dave have to add

[dave the builder]

There may be an argument for doing it whilst you're there, but... If the other pipe hasn't been disturbed during other work, then I would be inclined to leave well alone...

See what Nick and Dave have to add

if it isn't broke ,leave it well alone
if it is broke ,blame someone else 

[henryd]

There may be an argument for doing it whilst you're there, but... If the other pipe hasn't been disturbed during other work, then I would be inclined to leave well alone...

See what Nick and Dave have to add

Seeing as the manifold had to come off for access, I would be doing all of the joints, as for that pic surely there should be an O ring on that pipe

[Viral_Jim]

Seeing as the manifold had to come off for access, I would be doing all of the joints, as for that pic surely there should be an O ring on that pipe

I'd agree with this, the parts to renew the seals must be pence, and the incremental time to do it must also be fairly minimal.

[terry paget]

There may be an argument for doing it whilst you're there, but... If the other pipe hasn't been disturbed during other work, then I would be inclined to leave well alone...

See what Nick and Dave have to add

Seeing as the manifold had to come off for access, I would be doing all of the joints, as for that pic surely there should be an O ring on that pipe

I suspect you are right. I have popped on an 'O' ring from my assorted box thereof; it looks right to me, though none came off with the pipe unless it dropped off. The end of the tunnel seems shaped to receive it too. Any comments anyone?
.

[Doctor Gollum]

Buy new from Vx and check carefully and repeatedly before reinserting the pipe that nothing is left in the casting

[terry paget]

Right pic

[terry paget]

Hopefully the right pic

[terry paget]

Tunnel picture 1 taken with Samsung A10 phone, has flash near lens

second pic of tunnel. Is this an 'O' ring receptive tunnel I wonder?

[terry paget]

Buy new from Vx and check carefully and repeatedly before reinserting the pipe that nothing is left in the casting

On reflection the thermostat pipe end would also accept an 'O' ring, similar size to the 'O' ring I popped on to the tunnel end, though the 'O' ring I put on tunnel end is a bit thin. It seems likely that the same 'O' ring should fit both ends, so worth getting from Vx. The whole point of this exercise was to cure a coolant leak.

[terry paget]

This morning I pushed the pipe with 'O'ring into the tunnel and it went in satisfactorily, seeming to touch the sides and possibily making a seal, like the thermostat connector on the V6 Omega. It did not go against a stop'.  Looking inside again I do not see a complete ridge. In my Clarke 419 'O' ring set  they come in two thicknesses, 2.5mm and 3.5mm section, the 22mm ID seems to be the best fit.

It's not my world. Are most 'O' rings either 2.5 or 3.5mm section, or do they commonly come in any section?

[Doctor Gollum]

That baked mess next to the o ring is/was the seal.

Do yourself a favour and buy the genuine parts for the actual job rather than trying to cobble a solution from the interweb 

[Nick W]

There may be an argument for doing it whilst you're there, but... If the other pipe hasn't been disturbed during other work, then I would be inclined to leave well alone...

See what Nick and Dave have to add

Seeing as the manifold had to come off for access, I would be doing all of the joints, as for that pic surely there should be an O ring on that pipe

Do all of them while it's apart. Otherwise you'll be doing the job next week when the back seal fails. Make sure you clean the mounting faces and use a suitable lube so everything assembles easily without damaging your new seals.

[terry paget]

I tried the square section ring from the thermostat end of the pipe on the tunnel end, see above pic; it fits a treat. Perhaps both end rings were the same, not 'O' rings at all.
Has anyone access to Vx parts lists?

[dave the builder]

the original  seal is STILL in the grove to the right of the extra seal you have now added on the pipe Terry
the black and rust section between 2 metal flares of the pipe