Turbo charger Torques
 

Anyone got the specs to torque the shaft nuts and flange bolts for my T3? SAE would be nice..nm torque wrenches are somewhat a rarity around here..

thanks!

I wonder if Haynes of the FSM lists it. Have you "googled" it?

The FSM provides no details for a turbo rebuild. And if the FSM doesn't, you can bet Haynes doesn't, either.

My reliable source (the guy who cleaned and rebalanced my T3 shaft, and who rebuilds turbos for a living) tells me the shaft nut torque is 18 in-lb, plus 90 degrees. If you don't have a torque wrench that measures in-lbs, just go "snug" plus 90 degrees.

As for the flange bolts (I assume you mean the housing bolts), I don't see how you can get a torque wrench on them. I'd recommend "very tight" in light of the fact that the turbo is subject to a lot of vibration, but not to the point where the bolt or housing is close to breaking. The compressor housing, of course, is aluminum, so you can't go beyond about 20 Nm (15 ft-lbs).

Good luck.

Paul

Ok, thanks Pjc! I guess that'll be my weekend project, shouldn't take vary long...I have to take the thing off the tap my pyro probe hole anyway :)

When there isn't a value listed, I've used my torque wrench to see when the nuts budge and use the approximate value to tighten them. I think I've used crow foot type ends attached to an extension rod to torque the turbo flange to the manifold.

But that doesn't really account for expansion and contraction and corrosion over the years, a bolt torqued to 20lbs now, in 15 years could release at 80.

I suppose the CRITICAL torque spec is going to be for the rotating assembly, other than that, I trust "rather tight" and some loctite

I've only used the values that made sense from clean non corroded nuts or bolts.