an idiots guide to journal turbo rebuilding

[rx213b]

I found it quite useful

[glenneaux]

While this video is relevant to my interests, this is a mitsubishi turbo, all the components are balanced at the factory so dynamic balancing isnt required, while most/all other turbos require balancing.

edit: i believe ?

[ls400x]

Is this confirmed? I want to pull mine apart

[rx213b]

I'm no turbo expert, but it is a plain journal bearing turbo.....I'm going to suggest that most things are similar. Those circlip pliers look rather specific

Some others may be able to say

[MRMOPARMAN]

nah, all mechanics should have a set of circlip pliers that will work on that.

[ls400x]

I meant the thing about Mitsubishi turbos

[glenneaux]

ALL Mitsu turbo wheels are balanced when you buy them. To determine if your turbo has been assembled with the wheels balanced separately or balanced further once the turbo has been assembled, you must look for balance grinds on the compressor locknut.

The locknut is ground because you cannot get to the backside of the wheels once the turbo is assembled. Any evidence of grinding signals the turbo has been balanced as a rotating assembly to an even finer balance tolerance than doing the wheels by themselves.

No grinds = component balanced; you can swap the compressor wheels without the need to have the turbo rebalanced.

Grinds = assembly balanced; you will need to have the rotating assembly rebalanced.

http://www.dsmtuners.com/forums/newb...o-evo316g.html

Doesnt really clarify but HTH

[hemiturbo]

It is really better to core balance anyway because the tiniest bending of the shaft after assembly will cause out of balance. It can be caused from the different compressor or even the nut. Even just pulling the bits apart and reassemble in the same rotation can throw off the rotor balance. Component balance is great but it doesn't account for assemble balance.
The circlip pliers to use are nothing special,the one in the video are just bent needle nose pliers which aren't the correct tool for the job. You can get the pliers from any tool shop that suits the size of the circlip.
Mitsubishi turbo's are generally good balance, unlike other types such as garrets, because of the stumpy design in the turbine shaft but I still wouldn't trust it.

[ls400x]

Thanks for the info guys. I'll leave it alone then unless it actually needs to come apart.