Thread: Specs on Defender Puma turbo studs needed asap.

Is it the same stud breaking each time?
Is the manifold warped?
Are you running factory tune/turbo/IC?

My understanding of Inconel studs is less for breakage and more for stud loosening or creep. As in when turbo gets hot, stud lengthens then as it cools it shortens at a different rate reducing clamping pressure leading to leaks (and breakage if left loose)

A factory tuned tdci shouldnt really be getting into the ricerboy "my hairdryer is glowing red" territory????

Interested to see whether the issue you have is similar to td5 manifold issue or something different?

Steve

I've got an Allisport intercooler, decat removed and a mild Alive remap.
I've had the manifold ground flat and a straight edge held on the turbo face which showed no warping. I've used the standard turbo gasket twice and the 3mm anealled copper gasket three times.

I don't drive like it's stolen, so I'm absolutely lost as to why this keeps happening.

As best as I can see the studs in question are LR009704 M8x1.25 x 38mm overall
like this
ERR551L | LR009704 | STUD | Land Rover | | Britcar (UK) Ltd

The part is used all over Landy engines from way back when.

An appropriate match in Inconel could be sourced here:
Studs & Nuts : M8x1.25 Inconel Stud & Nut Kit (4 Pieces) | GCG Turbochargers

Im still thinking you must be getting some pretty high heat cycling (high EGT) to stretch and loosen OEM studs.

Maybe the failing studs are telling you something about your EGTs????

However unlikely - I considered his Decat pipe is out of alignment and stressing the turbo housing angle...

Add some heat and it may be sufficient.


It does seem very odd though - a turbo stud shouldn't be suffering such thermal damage.

I've been on the road since posting my last comment, thanks to a local mechanic who was able to fit an exhaust bolt to the turbo flange. Not ideal I know but I'm on the road at least.

Thanks people.

I'll get smarter people than me to look at the alignment of the Decat.
Out of interest, is it possible to install a flexible join between the flange and the decat?