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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #1  
Old 11-29-2009
davidmbrady
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Default Series 60 Turbo

Does this look like a healthy turbo? While doing the CAC/Rad I thought I might as well take a look at the turbo. The radial end play is noticeable but I understand that these turbos are supported on oil pressure, and if the engine hasn't been run for a while the radial play is pronounced. As long as the compressor doesn't hit the housing apparently it's okay. Any one wish to comment? The vanes on the compressor are sooted and there's a black ring on the compressor housing adjacent to the vanes. The play in the thrust direction is virtually zero. This is a Garrett GTA42 turbo, Detroit Diesel part number 23528064. It has a built in waste gate.

After doing more research, my turbo GTA4202BNS is more likely a journal bearing, not a ball bearing. So I may have quite a bit of bearing wear.


Last edited by davidmbrady; 11-30-2009 at 02:13 AM.
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  #2  
Old 11-29-2009
diesel bill diesel bill is offline
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What is the milage on your coach ? The bearings in your turbo are full floating type and your inspection method is good. Was there any signs of oil on the the pressure side of the turbo ?
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  #3  
Old 11-29-2009
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looks like you have a couple cracked compessor fins, on the bright side, they are still in the turbo and not in the engine.
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  #4  
Old 11-29-2009
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where did the dust come from?
This side should be clean.
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  #5  
Old 11-29-2009
davidmbrady
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Quote:
Originally Posted by Mike Hohnstein View Post
looks like you have a couple cracked compessor fins, on the bright side, they are still in the turbo and not in the engine.
Folks,

Thanks for your input. I think my question is answered. The coach has 102000 miles, but the CAC has probably been leaking for some time. I've always kept an eye on my EGT and never let it get above 1000 deg F, but the gauge may be off, I'm the second owner, and the sensor is well downstream of the turbo. I believe I have journal bearings and there's a bunch of axial run-out. Needless to say, the turbo is being replaced. Now I gotta figure out what to put in. The latest generation are ball bearing and some are dual ball bearing. Some of these require water cooling. Then there's always the possibility of a power upgrade. I wander how the DDEC IV would react to more boost.

Mike, your eyes are amazing!
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  #6  
Old 11-29-2009
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That thing is all done, right?
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  #7  
Old 11-29-2009
davidmbrady
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Originally Posted by Crit Bliss View Post
That thing is all done, right?
It passes the fork test.
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  #8  
Old 11-29-2009
davidmbrady
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Quote:
Originally Posted by diesel bill View Post
What is the milage on your coach ? The bearings in your turbo are full floating type and your inspection method is good. Was there any signs of oil on the the pressure side of the turbo ?
Bill,

Thanks for your input. The mileage is 102000. I have to inspect again for oil in the pressure side.
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  #9  
Old 11-30-2009
diesel bill diesel bill is offline
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The black discoloration on the inlet side is normal. I think it is from the rubber air inlet connections. I dont see any damage to the compressor wheel from fod or abrasives. The correct way to check axial play is with a dial indicator. The measurement is made from the center of the turbo. You must remove the exhaust side and move the shaft up and down equally from both sides. With the exhaust removed, look at fins on the inside of the hot section for damage. If all checks out and there is no oil on the pressure side, from what I see your turbo is OK.
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  #10  
Old 11-30-2009
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i am with diesel bill but sounds like a BB turbo is what you want/need???
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