Hey all, Just wondering if there should be any shaft play in a GT 35/40 roller bearing turbo. ? Thanks

no! Some original photos have not been recovered yet.

Hmm, I just got one second hand and there id definately slight movement... I am just not sure due to the roller bearing setup if this was normal.

Yeah there is some play. Can't tell you how much as I haven't measured it. Find someone down there and have a look at theirs. If your definition of slight movement is the same as mine, then you're fine

mine has the slightest of slight movements. Tho it hasnt been used yet. *side question* on an RB30 how much psi would it take to get ~450hp@wheels?

Thanks guys, The movement is only slight. I am guessing this is due to the roller bearing. Anyway this makes me feel a whole lot better. Thanks

Yes slight movement is acceptable. Mine had it and ran 32psi no dramas without a hitch!

every turbo be it thrust raced or ball raced will have slight movement , it cannot have none

yes it can, but it wouldnt spin haha Some original photos have not been recovered yet.

a little movement side to side is fine, but movement in the shaft back and front is no good at all.

bump this thread up what causes shaft play in these turbos? stardard t3 with 20 psi through it and after a while the shaft would be all over the place... but what about in the gt35?

Quote: Originally Posted by busted a little movement side to side is fine, but movement in the shaft back and front is no good at all. That's when you start bending exhaust fans(blades). Going back some time now I notice some loss in boost and power. I thought I had a boost leak or something. Anyway I kept on driving saying to myself I must fix that boost leak. I couldn't find the boost leak and was wondering what was going on. Anyway about 3 weeks later I was driving down to Mulgrave and notice a grinding noise, especially when boosting and back off the accelerator. What had happened was the exhaust fan was hitting the housing which damaged the exhaust wheel, bearings and center housing. So don't leave it to late because you might end up digging into your pocket more the longer you leave it. To check bearing clearances, there's usually no need to remove or disassemble the turbo. A dial indicator can be positioned against the shaft hub to check for bearing free play. Up and down shaft movement should be no more than 0.003 to 0.006 inches. End play should be 0.001 to 0.003 inches. This test may not reveal excessive clearances, however, if the turbocharger has varnished or coked bearings. Some original photos have not been recovered yet.

Quote: Originally Posted by vlthunter bump this thread up what causes shaft play in these turbos? stardard t3 with 20 psi through it and after a while the shaft would be all over the place... but what about in the gt35? Wrecked bearings.