The manual says to replace the four nuts on the studs holding the turbo to the exhaust manifold. Is this really necessary? They're not cheap and manuals often tell you to replace parts for no reason.

Thanks,
Alex

 

I would replace them. The nuts are oval shaped and the deform as they go on to prevent them from loosening up.

 

you "should", but you can use them again.

 

I have used them before, but I have also seized a few, so I will be replacing mine from now on.

 

Metal fasteners exposed to extreme heat cycling fatique over time, lose strength and will not hold a torque setting accurately after they have been removed. The professional way would be to replace them.

Spending a few extra dollars to protect such an expensive part with the correct clamping force would be a wise investment.

 

Amen brother. Something like that, from a mechanical standpoint is not worth the risk. Replace them. How much does Mazda want for them? Tom

 

They are very expensive. The studs/bolts are around $11 each. The nuts are about $5 each.

 

If I remember correctly, I paid around $8 each for studs and around $3 each for nuts from Mazdaformance.

 

Again, I would replace them. Don't take the chance Alex.

 

Oh hell, they're definitely getting replaced at $10 a piece. Someone told me it was like $200 for just the nuts, I raised the B.S. flag but he seemed confident. Thanks for the info.

Alex