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2G Bent Compressor Wheel EVO III 16G

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TrizzyRogers

Probationary Member
5
0
Jan 16, 2019
Richmond, Virginia
I’m in the process of rebuilding my EVO 3 16G turbo and noticed the smaller blades (not sure if inducer or exducer) are bent over pretty far. I ended up purchasing the bearing and seals rebuild kit from trader Greg. I purchased a new shaft, exhaust housing side for the turbo, and a new compressor wheel since I noticed the stock one was bent. After reassembling the turbo and putting the compressor housing back on, I noted the shaft wouldn’t spin at all. I tore it apart and can obviously indicate the two compressor wheels are not the same. I’m assuming the new compressor wheel is right and that my old one is just bent to hell. Is my compressor housing inlet not large enough for the new wheel?

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Does the turbo spin freely before you put the compressor housing on? If so, you should be able to see where the compressor wheel is touching the housing at causing it to jam up.

Also, that rotating assembly needs to be balanced before you run that turbo.
 
It appears it is catching on those smaller fins located under the larger ones on the compressor wheel. The shaft will move with your hand but it isn’t super smooth and I assume it’s because it hasn’t had hot oil run through it yet to free it up. I’ve also read that the components on these Mitsubishi turbos are balanced separately at the factory and there wasn’t a need for a rebalance. I know half of the community will say get it balanced the other half say just run it. My first problem is getting the compressor housing back on and over the wheel without it dragging LOL. Thanks for the reply!
 
You should have oiled the journal bearings when you installed them. The turbo should spin very freely once it's put together. Take it back out the exhaust housing and check that it's smooth. If it doesn't spin easily something is wrong.

Where did the compressor wheel come from? Is it a mhi wheel?
Check the inside of the compressor housing and make sure you don't have a burr or something sticking up and touching the
wheel.
The wheels are balanced from the factory but you still need to check the balance once you assemble the rotor group.
 
The journal bearings and thrust bearing were all greased with automotive white lithium grease before reassembly. With just the CHRA out of the housings, it will spin, but like I said it’s nothing like a turbo that has had some miles put on it. The wheel was purchased from a member on here that sells a lot of turbo parts on eBay. The listing states:

“Brand new Evo 3 16g wheel

Narrowed hub and light weight design

Component balanced

Works with big 16g and Evo 3 16g turbos ( serial number "45", "46", "47")

Doesn't work with a small 16g (serial number "52" small 16g)”

The inside of the compressor housing is clean and free of any burrs or imperfections. It’s almost as if the compressor wheel is too tall on the smaller fins and causing it to rub.
 
I got a complete kit and shaft and comp wheel from greg and it is perfect.your comp wheel might be a little different shape but should still fit fine if its for the E3 16G, the narrow shaft i dont know anything about but is that causing the comp wheel to not sit central?
 
I put the old compressor wheel on with the new turbine shaft and all and it works great. I just knew the old wheel had a small chip taken out of it (which occurred during disassembly) and noticed all those fins are bent on the lower level. All of the compressor wheels I’ve researched do not look like mine. They are both superbacks as well. I compared all the parts before reassembling and only noticed the difference in the compressor wheel fins.
 
Thank you fellow members for the input. The seller and I have been in contact and he advised that I sand down the housing a bit to fit the new wheel. After some sanding with 80 grit, the wheel fits perfectly. I’ll gradually increase the grit and eventually polish the compressor housing. Thanks for the quick responses!
 
I would have returned the wheel before I sanded down a machined surface. You don't just need the wheel to fit, you need the proper clearance that allows the wheel to work correctly and not hit the housing.

Whether you risk running it or not, it still needs to be balanced.
 
I’m in the process of rebuilding my EVO 3 16G turbo and noticed the smaller blades (not sure if inducer or exducer) are bent over pretty far. I ended up purchasing the bearing and seals rebuild kit from trader Greg. I purchased a new shaft, exhaust housing side for the turbo, and a new compressor wheel since I noticed the stock one was bent. After reassembling the turbo and putting the compressor housing back on, I noted the shaft wouldn’t spin at all. I tore it apart and can obviously indicate the two compressor wheels are not the same. I’m assuming the new compressor wheel is right and that my old one is just bent to hell. Is my compressor housing inlet not large enough for the new wheel?
Did you get the compressor wheel from Greg also? I've had customers send Greg's wheels along with their turbos to be serviced in the past and they looked identical to the MHI Evo III wheels....yours looks like a Chinese replica, the blades are twice as thick as the MHI wheel. At that point it's tough to say if the wheel itself will even fit a MHI cover or not.

Also, just because the parts you're buying are balanced doesn't necessarily mean they will be once the rotor group is assembled and torqued...especially if the thrust parts are not OEM. The OEM thrust parts are held to a much tighter machining tolerance which gives Mitsubishi the ability throw the unit together with no regard to how the wheels or thrust parts are clocked and let the VSR handle the rest. I've had aftermarket thrust parts go from pegging the meter on my balance machine to being 100% in-tolerance just by moving the spacers or the compressor wheel a little on the shaft. It's always a good idea to get your rotor group balanced, especially when using as many new parts as you are, just to be sure your investment is protected for years to come. Here's a great video on the topic:

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