Compressor wheel rubs inside of housing
07-23-2012, 06:10 PM
#1
Compressor wheel rubs inside of housing I bought a used MP70 from a member on here and he claimed it has low mileage but it was pretty dirty and the compressor blades were slightly chipped like it was run without a filter. It showed up with the compressor housing bolts snugged but not tight. One of the three brackets was bent.
Anyways, I took it apart, coated the turbine housing, and painted the compressor housing. While it was apart all I did was put some oil down the oil feed hole to keep it lubed. It sat on a shelf for a couple weeks till today when I put it together. With the compressor housing bolts snug, it rotates fine. Then when I tighten them to no more than about ~8 ft-lbs, the compressor blades rub in the inside of the housing. Turbine is fine. The shaft has 0.01" radial play measured with a dial indicator.
Did I buy a crap turbo or am I somehow assembling this thing incorrectly? Thanks!
I marked the blades with black sharpie to see where they were rubbing. You can see they are rubbing on the very corners. 10 of the 12 blades show rubbing.
Anyways, I took it apart, coated the turbine housing, and painted the compressor housing. While it was apart all I did was put some oil down the oil feed hole to keep it lubed. It sat on a shelf for a couple weeks till today when I put it together. With the compressor housing bolts snug, it rotates fine. Then when I tighten them to no more than about ~8 ft-lbs, the compressor blades rub in the inside of the housing. Turbine is fine. The shaft has 0.01" radial play measured with a dial indicator.
Did I buy a crap turbo or am I somehow assembling this thing incorrectly? Thanks!
I marked the blades with black sharpie to see where they were rubbing. You can see they are rubbing on the very corners. 10 of the 12 blades show rubbing.
Last edited by Ferocity02; 07-23-2012 at 06:31 PM.
07-24-2012, 11:56 AM
#4
Axial play is more important to check. (movement in and out). With radial play, the wheel centers itself (assuming its balanced) due to centrifugal force. Clamp the turbo in a vice and put your dial indicator on the end of the compressor shaft, and grab the turbine side and push it in and out.
07-24-2012, 12:40 PM
#5
Axial play is more important to check. (movement in and out). With radial play, the wheel centers itself (assuming its balanced) due to centrifugal force. Clamp the turbo in a vice and put your dial indicator on the end of the compressor shaft, and grab the turbine side and push it in and out.
07-24-2012, 12:55 PM
#7
Would there be any issue with filing down the corners of the compressor a tiny amount so it doesn't rub?
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07-24-2012, 01:06 PM
#8
I wouldnt take it apart. Its like removing a tire from a rim, it needs to be balanced. you could mark it, but i wouldn't risk it with a wheel spinning 100,000 RPM
I see silicone on some of the bolt holes. Did you do that? There is a chance the housing could be warped from someone over torqueing it. I would clean off all the silicone, and use a straight edge & feeler guage to see if there is any warpage.
I see silicone on some of the bolt holes. Did you do that? There is a chance the housing could be warped from someone over torqueing it. I would clean off all the silicone, and use a straight edge & feeler guage to see if there is any warpage.
07-24-2012, 01:20 PM
#9
I wouldnt take it apart. Its like removing a tire from a rim, it needs to be balanced. you could mark it, but i wouldn't risk it with a wheel spinning 100,000 RPM
I see silicone on some of the bolt holes. Did you do that? There is a chance the housing could be warped from someone over torqueing it. I would clean off all the silicone, and use a straight edge & feeler guage to see if there is any warpage.
I see silicone on some of the bolt holes. Did you do that? There is a chance the housing could be warped from someone over torqueing it. I would clean off all the silicone, and use a straight edge & feeler guage to see if there is any warpage.
07-24-2012, 03:42 PM
#12
I think I figured it out. Took a straight edge to the compressor housing backplate and it's definitely warped. The first two pics are of one side that's flat, and the other three pics are of the other side that's warped. This makes sense, the way its warped it will bring the compressor housing closer to the wheel causing it to rub.
Flat side:
Warped side, see gap under right side of straight edge:
Flat side:
Warped side, see gap under right side of straight edge:
07-24-2012, 04:43 PM
#15
Is it a magnum or masterpower?
Yes the seller would be a stand up guy if he did that. But there arent alot of stand up guys anymore. Most spend the money they get from your purchase right away and dont have the extra cash to refund.
Yes the seller would be a stand up guy if he did that. But there arent alot of stand up guys anymore. Most spend the money they get from your purchase right away and dont have the extra cash to refund.
07-24-2012, 04:59 PM
#17
I believe master power is now magnum.
The box looked okay, there are no signs of physical impact. Only sign of damage was one one of the compressor housing brackets was bent. The guy said he never used it, so he could have bought it bad. He is still at fault for selling me a bad part.
Compressor housing brackets:
The box looked okay, there are no signs of physical impact. Only sign of damage was one one of the compressor housing brackets was bent. The guy said he never used it, so he could have bought it bad. He is still at fault for selling me a bad part.
Compressor housing brackets:
07-24-2012, 05:08 PM
#19
You also may want to check the runout of the compressor wheel as it may be bent. 75,000 rpm and if its bent it will be terribly out of balance. Thats a recipe for disaster and possibly injury to the bystanders at the dyno or dragstrip.