Whatsup HT. Back with another question. I have a BEP S362 with t3 .70a/r turbine housing which I newly rebuilt. Bought a brand new kit from Borg Warner for the S300 series turbos (360, 362, 366). Assembled it myself with all the new goodies. Took it to a local shop to get the housings cleaned up and get her balance. When we put her back together it still had a little shaft play. So we took it apart to check the shaft and nothing was wrong. No excessive wear, marks or grooves. So we checked the bearing in the housing and it had some slight play to it. When its all assembled and oiled the wheel does not contact the compressor housing and spins freely as it should. Im just curious as to if this can cause issues down the road. I plan on boosting 20+ and don't know if those pressures will cause the shaft any excess movement or harm the bearing at all. Should I go ahead and replace the bearing section? Please chime in with suggestions.

Second question. I was wondering if swapping the 62mm comp wheel and cover for the larger 66mm wheel and matching cover would cause adverse affects on how the turbo functions. It being a Bullseye Power it has a 76.3ind and 67.6exd turbine wheel. Theres a version of the s366 which is "quick response" that has a 76ind and 68exd turbine. I just want to avoid mix-matching turbine and compressor sizes and have crap spool characteristics. Any insight would be appreciated

 

Sounds to me, it just needs some oil to lubricate the shaft and bearings. That initial "play" gets eliminated when a capful of oil is used. Simply tape the bottom of the oil return flange (Duck tape is fine) then pour a capful of non-synth oil in the oil feed and slowly rotate the wheel by hand to make sure the shaft is lubricated.... Keep the turbo horizontal.

Try it again, the radial "play" should lessen..

 

Ya that's what we did at the shop and the guy there said it still had a little excess play for being a fresh rebuild. I just don't know if it will hurt anything being run like that

 

The film of oil that lubricates the journal bearings centers the shaft as it rotates. you're fine.

 

Legit. Good to hear. Now how about my larger wheel question?

 

Hmm. depending upon the S362 package you have, you may have to switch cartridges. Not sure if the wheel can be "brought over" and machined to fit that bearing housing. It's been a while since messing with those. Give Dave a call at BEP. He'll set you straight.

 

Alright will do. Thanks

 

only way to accurately measure shaft play is to measure wheel play with a dial indicator... only then will you know if it truly is within spec.

The shop that cleaned the housings could have damaged/warped something. The wheel should not hit the housing, even without oil. Is the compressor housing evenly seated on the compressor backplate? if it's even the slightest bit crooked the wheel will rub the housing in only a few places

 

It doesn't touch the housing even without oil. The housing is straight as well. But the wheel never scrapes the housing. It spins freely and smooth