Kinda like this:
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| Turbo shaft movement tolerance-is there any? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=58865 |
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| Author: | FormerlyBankNote4x4 [ Sat Feb 12, 2011 10:03 am ] |
| Post subject: | Turbo shaft movement tolerance-is there any? |
I took off the intake hose (Pain in the arse when the engine is cold) and got a little movement in the turbo shaft when I tried to move it back and forth- maybe 1/16". I decided to check when I started hearing a rattling type noise from that area at low rpm's occasionally. Could the rattling be the fans hitting the enclosure from a degraded bearing not keeping them centered? Is this the beginning of the end for turbo? |
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| Author: | racertracer [ Sat Feb 12, 2011 5:30 pm ] |
| Post subject: | Re: Turbo shaft movement tolerance-is there any? |
Sounds like it could be and if the turbo is on its way out, then your lucky to have caught it before your engine took a dive with it. How many miles on the CRD? |
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| Author: | truckbouy2 [ Sat Feb 12, 2011 5:51 pm ] |
| Post subject: | Re: Turbo shaft movement tolerance-is there any? |
From Garrett What is/causes Shaft Play? Shaft play is caused by the bearings in the center section of the turbo wearing out over time. When a bearing is worn, shaft play, a side to side wiggling motion of the shaft occurs. This in turn causes the shaft to scrape against the inside of the turbo and often produces a high-pitched whine or whizzing noise. This is a potentially serious condition that can lead to internal damage or complete failure of the turbine wheel or the turbo itself. How much shaft play should my dual ball bearing turbo have? The Garrett full ball-bearing turbo is designed to have clearance between the bearing cartridge and center housing for hydrodynamic damping in addition to the internal clearances of the bearing cartridge itself. Hydrodynamic damping uses the incompressible properties of a liquid (oil in this case) and the space around the bearing cartridge to dampen the shaft motion of the rotating assembly. When the turbo is new, or has not operated for a long period of time allowing most of the oil to drain out, the rotating assembly will move more in the radial direction than a typical journal-bearing turbo because there is no oil in the center housing. This condition is normal. As long as the shaft wheel spins freely and the wheels don't contact their respective housings, the assembly will function properly. |
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| Author: | MrMopar64 [ Sun Feb 13, 2011 11:26 pm ] |
| Post subject: | Re: Turbo shaft movement tolerance-is there any? |
The turbo on the KJ engine has a "standard" journal bearing - the new Touareg/Q7 are the first to be in production with a ball-bearing VGT. Some slight movement is normal with these turbos. If the compressor wheel is contacting the housing you will see the witness marks on the inner bore of the compressor inlet, and also some slight chipping of the blade edges. |
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| Author: | Sir Sam [ Mon Feb 14, 2011 1:20 am ] |
| Post subject: | Re: Turbo shaft movement tolerance-is there any? |
Kinda like this:
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