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Old 02-16-2007, 09:52 PM   #1
bwco
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Default How To Check VF39 Turbo Shaft Play

Guys, I've a few questions about VF39 Shaft Play.

How do you check for VF 39 Shaft Play?
- I tried to wiggle (turbo off the car, was bone dry with no oil) the cold side shaft and bearing, it wiggles a lot. Like There's minimal force to hold it back.
- I tried to wiggle (turbo off the car, bone dry) the hot side shaft and bearing, same thing.

Is that shaft play?
- Should I hold on to BOTH the cold and hot side to wiggle it? Move it? Both in and out , left and right?

I've read threads that talked about "free floating" turbo, is there anything special about the VF39 that makes it wiggle freely?

I've read threads that talked about "oil pressure", does it matter if the turbo's been bone dry to attribute to the shaft play?

Is it normal to have shaft play on a 5000 mile VF39? No cracks yet, no oil residue on hot side, no scars or lines on the turbine wheel or housing.

Please fill me in. Thanks in advance
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Last edited by bwco; 02-16-2007 at 10:07 PM.
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Old 02-16-2007, 10:10 PM   #2
Uncle Scotty
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...some slight radial play is allowable....axial play is NOT
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Old 02-17-2007, 04:23 PM   #3
bwco
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Quote:
Originally Posted by Uncle Scotty View Post
...some slight radial play is allowable....axial play is NOT
how much do u mean is "slight"? Is there any OEM spec that I can find?

No information for the 06' STi VF 39 turbo yet?
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Old 02-17-2007, 04:52 PM   #4
ChristopherG
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The 06 VF39 should be the same as every other VF39 that was put on STi's from 04 and on...

If it "wiggles a lot" I'd assume that's NOT good...
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Old 02-18-2007, 12:13 AM   #5
jdbewl01
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i think you should look to see if there are score marks ringing the area around the turbine fins (in other words, marks in the housing); that means that the turbo has a lot of play while in function. if you can grasp the end of the turbine shaft and pump the whole turbine assembly in and out, then there is also axial play. these two symptoms mean the turbo needs to be rebuilt or replaced. hope this helps,

-jeremy
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Old 02-18-2007, 06:03 AM   #6
bwco
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The VF39 has no axial play. However, loads of radial play. It's weird that theres no score marks and no scratches on the fins or housing.

Is this turbo still good? It has loads of radial play due to zero oil pressure cause it's bone dry?

I'm so confused.
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Old 02-18-2007, 10:40 AM   #7
s42k1
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Typically, a compressor wheel should have less than 22 thousandth of an inch clearance, (0.0022) and more than seven thousandths to allow enough it to function properly. If you can't measure in such small increments, then see if you can make either wheel contact the housings. If you cant make the wheels rub, you should be alright. Then, try to push and pull both wheels laterally through the turbo and see if there is any movement. If the wheels can move in this direction then you probably have a thrust bearing that failed. This only applies to standard journal bearing turbos, as ball bearing units may require slightly more clearance and may have more shaft play than standard turbos. I think you will be fine.
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Old 02-18-2007, 06:48 PM   #8
ten94tuner
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i would say some play is tolerable but a lot can be very bad.
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