Thread: Noise when accelerating

Originally Posted by Daniel

Just another thought, have you checked the manifold to turbo mount/gasket?

Yeah it was a one piece gasket, covering the the turbo inlets and exhaust outlets. All seems ok, the gasket was brand new, but as I said earlier after fitting the turbo, and some fool overtightening one of the studs, the new gasket blew near the oil dipstick. Patched it up with sealant, which as you pointed out probably won't like the temps involved, but the rest of the gasket seems AOK. I suspect one of the studs where the turbo faces up may be a bit loose due to overtightening as well, but can't feel any air escaping anywhere along the manifold
When I get round to replacing the studs, I am going to need to repair the thread on one or two of them - any suggestions as to what is best? Has anyone used the permatex thread repair stuff, and does it work ok, or should I just go with a helicoil and be done with it? Big fan of the cheaper options, but I also don't want the same problem a few months down the track, need to get the car in good shape so I can start going out bush again.

Originally Posted by Daniel

Every turbo diesel engine needs to have its exhaust manifold mounting face machined every 150k kms or thereabouts - that's just the way it is - .

Bollocks

I'm afraid I have to call bollocks on that too.

Originally Posted by JamesB71

I'm afraid I have to call bollocks on that too.

That's OK but just do a search on all the other turbo diesel exhaust manifold leaks/warping issues that are out there - this is not unique to LandRover engines.

So much so that LandCruisers and many other diesel engines have exhaust manifolds that come in pieces joined together by fancy expansion joints to attempt to limit warping. Inevitably they still warp and need refacing. You can however believe whatever you like.

Originally Posted by Brett1066

...........
When I get round to replacing the studs, I am going to need to repair the thread on one or two of them - any suggestions as to what is best? Has anyone used the permatex thread repair stuff, and does it work ok, or should I just go with a helicoil and be done with it? ..........

Nothing but a solid thread repair will work. Either get helicoils put in or get the threads repaired with custom thread repair inserts. Are you sure the threads in the head are stuffed and not just the stud threads?

No definitely the threads in the head are stuffed, the studs themselves look ok. Broken enough threads in my time to know the feeling when a internal thread goes as you are tightening . I figured I would have to use a helicoil or thread insert, but was hoping that maybe someone had used the permatex thread repair and had good reviews of it.

Look like I will be buying a new gasket, studs, thread inserts.....the list goes on.

Originally Posted by Daniel

That's OK but just do a search on all the other turbo diesel exhaust manifold leaks/warping issues that are out there - this is not unique to LandRover engines.

So much so that LandCruisers and many other diesel engines have exhaust manifolds that come in pieces joined together by fancy expansion joints to attempt to limit warping. Inevitably they still warp and need refacing. You can however believe whatever you like.

No need for hostility just because someone has a different opinion. Ive just had a different experience to you.

Ive owned a quite a few diesels, both turbo and normally aspirated over the years and done literally hundreds of thousands of kms in them without ever having this done, or suggested by any of the mechanics that I have used. True, Ive never owned a LR before, but Ive had a toyota with 500K kms on it and it was still going strong when I sold it. My gradfathers disco has >200K km on it and never had this suggested...

Im curious, is this a LR thing? What is the general opinion of the populace here?

No hostility from me at all - all the hostility appeared to be coming from you.

I have driven about 2 million km in turbo diesels during my driving life and have frequently come across this issue. In fact on my 80s LC we have had to do the manifold machining a couple of time snow during it's 550k km life.

Most mechanics don't deal with such issues - you need to speak to machinist shops who get called upon to fix these things once mechanics give up.