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

[Zoobeef]

Some decent metal locking nuts like Philidas turret nuts.

I normally whip the intercooler box off for more access for the rear turbo.

[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?

[Zoobeef]

They should be M8!

[Hairsy16]

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

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

Thank you

[andygtt]

If it's not a metal gasket they will come loose regardless... Proper nuts and studs are a must however.

[kenloen]

aerotight lock nuts (ebay?) will do the job.

[simon 3 R]

Hi Dave dont use lock tight or spring washers use K nuts and it will never come lose again trust me Iam a doctor had this problem my self 12 months ago put the manifolds on with K nuts as well job done.

[Blu3R]

Philidas do a double bent beam turret nut which are ace for this sort of application. If you can use an EZP or BZP bolt too that helps in the higher tensile (12.8) variety. I use a 1.5mm copper gasket which personally I think is better than the steel ones because you can get a good bite and a decent seal around the whole circumference of the port.

[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.