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Transporting tubo equipped machines

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buckfever

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Aug 12, 2010
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southwest pa
My dad has use cover the exaust only in the cold weather because he was affraid that cold air could hit the hot exaust valve and bend it. Don't know if its true but I don't ge a choise.
 
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vtcntrctr

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Sep 14, 2010
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vt
way to drege up an old thread. although - I was going to do it anyways.

I've been thinking about this, particularly the "no air flow" argument. I'm wondering if perhaps this all got started with the turbocharged 2 stroke detroits. on those engines I believe it would be possible for air to flow backwards through the turbo, into a cylinder with open exhaust valves, out the open intake opening and out of the engine, its possible that the turbo could spin freely and burn itself up.
 
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Shimmy1

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Aug 14, 2014
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4,350
Location
North Dakota
vtcntrctr said:
way to drege up an old thread. although - I was going to do it anyways.

I've been thinking about this, particularly the "no air flow" argument. I'm wondering if perhaps this all got started with the turbocharged 2 stroke detroits. on those engines I believe it would be possible for air to flow backwards through the turbo, into a cylinder with open exhaust valves, out the open intake opening and out of the engine, its possible that the turbo could spin freely and burn itself up.
Click to expand...

Since the other one was revised, figured they both deserved some love. Especially since this reasoning is the best I've heard yet. Both ways. :naughty
 
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Scrub Puller

Senior Member
Joined
Mar 29, 2009
Messages
3,481
Location
Gladstone Queensland Australia
Yair . . .

As I mentioned on the other thread on this subject I have good reason to believe turbo damage can occur from transporting turboed equipment but it has little to do with the shaft spinning from the air pressure . . . I am satisfied that's a myth.

Extract from a post by Iron Horse in 2008

The shaft is susspended by the pressurised oil
Click to expand...

That is exactly right and, what I believe can happen is, with no oil pressure (particularly on rough or washboard roads metal to metal contact can occur.

Probably more so with a worn turbo . . ."brinelling" or "fretting" are the terms used for this phenomenon.

As I mentioned this would explain the regular turbo failures of equipment floated to a remote mine site over atrocious roads.

So to sum up it is good practice and there are good reasons to cover the stacks during transport but wind milling turbos are not one of them.

As I mentioned in that post this problem has been known for many years and, when transporting large turbos there was a procedure and hardware to centralise the rotating shaft assembly in the oil gap.

Cheers.
 
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