Turbo to manifold nuts loose

[Hairsy16]

For the second time recently, the nuts holding my rear turbo to the manifold have come loose. Last time, the turbo had been fairly recently replaced and so I assumed it was just a case of needing a tweak after new gasket had bedded in etc.

I have some questions:

1) Is there a likely reason why they may have come loose a second time (apart from them just not having been tightened enough - it was done trackside by a friendly mechanic)?

2) Is there any point in loctite or similar, given the heat that's generated there?

3) Any tips for getting the best access to the nuts so that I can ensure that they are tightened properly this time - what direction do you go in from. Is it best with clam off?

Thanks very much

Dave

[Hairsy16]

Zoobeef said:

Some decent metal locking nuts like Philidas turret nuts.

I've never come across these before but they look like just the ticket. Do you happen to know the size?

[Hairsy16]

Would this do the trick - M8 x 1.25mm ????

http://www.demon-tweeks.co.uk/motorsport/nuts-bolt...

Thank you

[Hairsy16]

Thank you all - lock nuts ordered.

Any further advice on getting access to the nuts? They don't seem terribly easy to get to.