compressor wheel install ?'s - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 06-25-2007, 02:53 AM Thread Starter
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compressor wheel install ?'s

I am familiar with how to install the wheel and why, but I've been told that when you install a new wheel that the turbo needs to be balanced, and if you don't then it will fail prematurely due to vibrations from the new wheel. Has anyone else heard this or was I being fed a line? I am installing another one and need to know. Thanks,

Doug
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post #2 of 9 (permalink) Old 06-25-2007, 03:03 AM
 
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You can get away without balancing the new wheel, but it's a gamble as it might last but it might not. I rebalance a turbo any time I have one apart. It's easy enough to do, or inexpensive enough if you have to have it done somewhere.

If the turbo is not balanced you are taking a chance. If the new wheel is close enough to the old one then it won't cause much of a problem. However if the new wheel isn't weighted the same as the old then it will cause the turbo to fail sooner than it would normally. At 125,000+ RPM a little out of balance adds up to a lot of stress.

That being said, instead of getting 200K miles out of the turbo you might get 150K. On the other hand most turbo shops charge about 100 bucks to balance, less in some cases.
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post #3 of 9 (permalink) Old 06-25-2007, 04:20 AM
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THere is no need to rebalance a turbo after a wheel install... The turbo was ballanced before the wheel, the wheel is ballanced, there for there is no reason to ballance again. Look at the wheel when you get it, you will see little ground off spots. This is where the wheel was ballanced in manufacturing. Some people feel the need to spend more money for nothing... I have install 8 WW for people and never ballanced one of the turbos... None have come back...

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post #4 of 9 (permalink) Old 06-25-2007, 04:48 AM
 
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The wheel is balanced, but when you install that wheel onto an assembly the assembly is not balanced. Every one I have had on the machine has needed some balancing. If the wheel is a cast one, then it usually needs more work. If the wheel was machine from a billet they are usually much better out of the box.

Just because the turbo was balanced does not mean once you disturbed it that it will automatically be in balance when the new wheel is installed. When you install the new wheel onto the shaft you run it on the balance machine and then, depending on what the machine tells you, you make rotational changes using the notch machined into the wheel at the factory.

Garett says that any time the turbo is disassembled the following components need to be checked for balance (the compressor and turbine wheels are checked individually at the MFG): 1) Turbine wheel and shaft 2)thrust collar, 3) oil slinger, 4) Compressor wheel, 5) nut. Holset and BG also have similar requirements when working on their turbo's.
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post #5 of 9 (permalink) Old 06-25-2007, 05:03 AM
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Quote:
Originally Posted by 1040 WreckerMan
(the compressor and turbine wheels are checked individually at the MFG
YOU said it right there... the parts are balanced individually at the factory... at no time are they balanced together as a unit...

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post #6 of 9 (permalink) Old 06-25-2007, 05:24 AM
 
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Yes I said it right there, I also said that only applies the wheels not the assembly. It is possible that the wheels are balanced, but when installed the TURBO is out of balance, which is why I said turbo's should be balanced. Those parts are checked as an assembly normally any time the turbo is disassembled.

That is why Garrett says the turbo should be balanced any time it is disassembled (even if no parts are replaced).
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post #7 of 9 (permalink) Old 06-27-2007, 10:12 PM
 
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Does the wicked wheel take any of that chopping sound out of the turbo??
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post #8 of 9 (permalink) Old 06-28-2007, 01:46 AM
 
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what dose the wicked wheel do for you
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post #9 of 9 (permalink) Old 06-28-2007, 02:26 AM Thread Starter
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Yes, it will help to get rid of surge and flutter. It also makes the whistle louder. It will not make more power, just makes more constant boost and makes the turbo last longer, if you install it correctly.
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