K04 Shaft Play

[TheHolyCobra]

Need to know if this shaft play is "normal". I have some experience with ball bearing turbos, and this is WAY too much shaft play if they were BB. But being journal bearing K04s this is a whole new ball game for me...

http://www.youtube.com/watch?v=tbB9iuUMdvQ
http://www.youtube.com/watch?v=rEAr0fQFuf4

Any opinions or comments would be greatly appreciated.

[bez101]

id say to much play
the 1 i just have rebuilt wasnt that bad

[hercfe]

Don't use those anymore. They need rebuilt. They are dangerously close to contacting the compressor housing. If they score the compressor housing wall, you will need more than just a rebuild. Rebuild kits cost around 50 bux, and if you mark the turbine shaft and compressor wheel for alignment, you can do it yourself without the need for balancing. Get a rebuild kit with a 360 degree thrust bearing, rather than a 270. That will prevent them from excessive shaft play in the future.

[julex]

IT is really a simple problem once you realize what's an allowed shaft play in journal turbos. While lateral (side to side) allowed shaft movement is something to the order of 1-2mm, there should be none or almost none axial (when you push/pull the rod) movement since this is indicative of worn seals.

Once the turbo gets its oil feed pressurized, the oil film flowing around the shaft serves as a bearing and centers shaft in its housing. The same pressure exerts longitudinal forces and pushes shaft end seals against housing... Once these seals fail, your turbos go bye-bye.

In your video it seems like ther is a lot of lateral movement which might be ok (but it is definitely on large side) but also a lot of axial movement which is not ok at all.

[Audi_S4]

How much is a simple rebuild in the US ?
So just the basics, bearings and seals when no damage is done to the blades and such.

[Pete_S4]

[QUOTE=Audi_S4;5961870]How much is a simple rebuild in the US ? QUOTE]

I just had mine rebuilt for about $500 each by a rebuilder that VAST performance works with.

[TweetsS4Estate]

How much is a simple rebuild in the US ?
So just the basics, bearings and seals when no damage is done to the blades and such.

just had a set fully cleaned, rebuilt, wheels were cleaned and sharpened and the whole assembly was ballanced for $830 with labor and parts.

[Tekron]

rebuild kits are 50-100 dollars for these turbos and you should do them yourself, i recommend not paying 830 dollars.

[DiscoPotato]

thats too much, your tubo is likely to blow when the fins will make contact with the houseing

[TheHolyCobra]

Any links to these $100 quality 360* thrust bearing rebuild kits? I was under the impression that the cheap Chinese rebuild kits were junk so don't get those.

Also, what about balancing the turbine shaft after rebuild? Can shops do that for fairly cheap?

[stefanruse]

I have the same dilemma. I both pair of K04 turbos. I was told that they had 6k on them and i thing that they had a shaft play little bit less then this on the video. I need to know from where to find this repair kit?

[zakario]

damn OP those are shot.
http://www.ecrater.com/p/4122516/bor...er-kkk-k03-k04

[TipTucker01]

Yeah, those are no bueno. Ideally, no shaft play.

[julex]

I have the same dilemma. I both pair of K04 turbos. I was told that they had 6k on them and i thing that they had a shaft play little bit less then this on the video. I need to know from where to find this repair kit?

To put this into perspective. I got a set of new BW K04s and while one of turbos was really tight and nice, the other one had at least 1mm lateral movement on the shaft. Both had NONE play axially (back and forth along shaft) which is what counts for the reason I explained in this thread above.

So if your shafts don't move back and forth and they don't bang around casing when you move the shafts laterlly, you're ok.

[MAS4K04]

To put this into perspective. I got a set of new BW K04s and while one of turbos was really tight and nice, the other one had at least 1mm lateral movement on the shaft. Both had NONE play axially (back and forth along shaft) which is what counts for the reason I explained in this thread above.

So if your shafts don't move back and forth and they don't bang around casing when you move the shafts laterlly, you're ok.

^
Agreed as i have the same new in box Borgs and have about the same as you

[stefanruse]

Mine turbos had 2/10 of mm axially (back and forth along shaft) play. what do you suggest to put them like that or rebuild them first?

[julex]

Mine turbos had 2/10 of mm axially (back and forth along shaft) play. what do you suggest to put them like that or rebuild them first?

You'd have pay for professional rebuild services or do it yourself but you'd need a balancing lathe. The turbos need to be balanced after taking apart, they spin at 150k+ RPMs and even slightest inbalance will quickly kill the turbo. With 0.2mm shaft play, almost undetectable, you will probably be ok.

[coreyj]

turboauto.biz $350-$425 rebuild each turbo with balance.

[Doug@FrankenTurbo]

To put this into perspective. I got a set of new BW K04s and while one of turbos was really tight and nice, the other one had at least 1mm lateral movement on the shaft. Both had NONE play axially (back and forth along shaft) which is what counts for the reason I explained in this thread above.

So if your shafts don't move back and forth and they don't bang around casing when you move the shafts laterlly, you're ok.

I don't see anything in those videos that shows them to be worn out. Where did you get them from? Were they working properly before being pulled?

[stefanruse]

I don't see anything in those videos that shows them to be worn out. Where did you get them from? Were they working properly before being pulled?

These videos are not mine. I was told that they worked properly.