New T04z Shaft Play

[saliya]

Hey folks,

I am the proud owner of a new T04Z, got it out of its box to have a look and there seems to be a _lot_ of shaft play just with

the old finger-wiggle.

Not having had a large BB turbo in my face before, I am happy to demonstrate my ignorance and ask: how much

should it have? If this were a bush-bearing turbo I'd be sending it in for a rebuild - but BB turbos apparently have

more shaft play (edit: with no oil in them).

The question is: how much more? It seems to have around 1mm or so at the end of the shaft. Is that excessive?

edit: answer is 'no, that's not excessive'

Regards,

Saliya

Edited April 20, 2006 by saliya

[CruiseLiner]

Hey folks,

I am the proud owner of a new T04Z, got it out of its box to have a look and there seems to be a _lot_ of shaft play just with

the old finger-wiggle.

Not having had a large BB turbo in my face before, I am happy to demonstrate my ignorance and ask: how much

should it have? If this were a bush-bearing turbo I'd be sending it in for a rebuild - but BB turbos apparently have

more shaft play.

The question is: how much more? It seems to have around 1mm or so at the end of the shaft. Is that excessive?

Regards,

Saliya

my brand new hks to4z feels exactly the same i got worrried bigtime but it runs fine and spools and spins about 1 min after i turn the car off so its fine.

feels abit wobbly even compared to a mates garret gt3040r, but i reckon the more loose the less friction i suppose. and the oil takes up the slack.

Edited April 20, 2006 by CruiseLiner

[R31Nismoid]

Ball Bearing turbos have less shaft play than Bush Bearing

If your worried, push a bit of oil through it via a squiter or something.

It will reduce the play a little.

Remember when the turbo is operating it has a masive volume of oil running through it.

At the moment, yours has nothing around the bearings but air.

1mm is spot on IMO

[Guilt-Toy]

yeah the oil with help with it. my gt3540 felt a little sloppy but now when is switch car off it spins down for over 30 seconds and it feels much better

[Busky2k]

But its the same with a bush bearing. Fill it up with oil and it'll have less play. I didnt think a ball bearing race would have been the same, and moreover they dont use much oil ie restrictors.

[darkstar]

Turbo shaft play is NORMAL.

Try telling that to the Magazine Mechanics who would tell you otherwise!

Unless the shaftplay is causing the turbine blades to rub against the housing, ie: excessive shaft play causing obstruction, it is 100% Normal.

Free shaft play, with no oil can be reduced to minimal or no shaft play once oil is filled into the turbo.

Also remember to prime the turbo with oil before you install it.