tzbfwt

iTrader: (1)

OK - I've searched and I've got the Robinette and the stock rebuild (arexseven?) from this site too.

Now - I'm in the middle of my stock twin rebuild and I can't seem to get it right.

The nut is either too tight (turbos don't spin freely like I think they should - the nut must be preloading the thrust bearing) or the nut is too loose - and I can spin the comp wheel in relation to the turbine - the comp wheel is spinning on the shaft. If I tighten the nut too much (beyond the point where all axial play is removed) - then the assembly seems to bind up and not spin freely - at least it as not as free spinning as the old set I have. Do they seem tight at first, but loosen up later on the car? AreXseven had to send his back to TC - they told him he had tighened the nut too much - and his turbo sounded like a fire engine with no boost - I suspect the rotating group just had too much drag and wasn't spinning fast enough?

So - I have one more thing to try before I ship the whole mess to turbo city - I'm going to red locktite the wheel to the shaft, tighten the nut just enough to take the axial play out of the turbo - and then locktite the nut (obviously).

Since I had to press the comp wheel off the shaft when I took it apart - I think the factory had some type of thread locking compound on there to start with - and I think this is the only way that the compressor wheel will stay on without over-torqueing the nut.

Anyone have any experience here? No one mentions locktiting the wheel in their rebuild articles - but I don't see any other way !!

tzbfwt

iTrader: (1)

well - i tried some red locktite (224?) and now I have a different problem - the locktite sets up too quickly and I can't get the nut tight (ie there's still axial free play) even after I tighen the nut.

So I suspect the locktite is locking the comp wheel on the shaft, the nut doesn't have enough force to overcome the locktite - and so the compressor wheel can't snug down and remove the axial slop.

So now I'm thinking that I need to assemble everything dry, torque the nut to take out the axial play, then remove the nut and squirt some locktite on top of the compressor wheel, hope that some of it gets down between the wheel/shaft, loctite the treads, install the nut.

any other ideas people?