srsu99
Bronze Member
I trry to always cover it. Now remebering to uncover before I unload is another story!
Warnings...
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mahlers
Gold Member
It's true that they don't want to warranty the turbo - especially since we all have a 5-year Emissions Warranty on that, and everything else that affects the engine emissions. That's a long time to cover something that is real expensive to fix.
RickB
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mahlers said:
There is no complete path unless the intake and exhaust are open simultaneously on the same cylinder. There is a better chance of debris falling down the stack and causing damage to the exhaust turbine than bearing damage from a turbo spinning dry when trailering.
OP
jimg
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How would 'pieces' get past the muffler? Since Ive never pried one open maybe the answer is obvious.
NoMo
Gold Member
Deere also states in their owner's manual to cover the exhaust when trailering the tractor.
RickB
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This topic has been beat to death on a leading ag discussion forum with about the same result:
Viewing a thread - Turbo bearings?
Viewing a thread - Turbo bearings?
srsu99
Bronze Member
Posted 3/11/2007 23:35 (#118537 - in reply to #118526)
Subject: Re: Turbo bearings?
Hagen Brothers farms,Goodrich ND Once before when the wind down the pipe and spinning the turbo thing came up,I researched a half dozen or more turbo builder/re builder sites to see what their failure analysis page had to say. Not one listed wind magically blowing down the pipe and spinning the turbo as a cause of failure. Almost all of them listed keeping the pipe covered to prevent the entry of road trash,dirt and rain out of the turbo and engine, as the only reason to cap the pipe.
When you think about it, there is no way for air to blow through an engine that is not running . there is no direct path through an open exhaust valve into a cylinder and out the intake because there is no time that both intake and exhaust valve of a given cylinder are both open at the same time. The overlap between the exhaust valve closing and intake valve starting to open does not count, as neither valve is open more than a tiny fraction of an inch. not enough to blow a feather through the engine,never mind the flow needed to windmill a turbocharger
This was on that site makes sense, hope they dont mind me moving it over here.
Subject: Re: Turbo bearings?
Hagen Brothers farms,Goodrich ND Once before when the wind down the pipe and spinning the turbo thing came up,I researched a half dozen or more turbo builder/re builder sites to see what their failure analysis page had to say. Not one listed wind magically blowing down the pipe and spinning the turbo as a cause of failure. Almost all of them listed keeping the pipe covered to prevent the entry of road trash,dirt and rain out of the turbo and engine, as the only reason to cap the pipe.
When you think about it, there is no way for air to blow through an engine that is not running . there is no direct path through an open exhaust valve into a cylinder and out the intake because there is no time that both intake and exhaust valve of a given cylinder are both open at the same time. The overlap between the exhaust valve closing and intake valve starting to open does not count, as neither valve is open more than a tiny fraction of an inch. not enough to blow a feather through the engine,never mind the flow needed to windmill a turbocharger
This was on that site makes sense, hope they dont mind me moving it over here.
If wind could cause damage, it seems like they would also have warnings to park your tractor indoors. 20 years of sitting out during wind storms would surely cause more damage if it really was an issue.
daTeacha
Veteran Member
You've never seen a piece of equipment parked with a can over the exhaust? It's pretty common around here, but mostly to keep things like chimney swifts and water out of the pipe. 
I, too, don't buy the wind down the pipe spinning the turbo story. Water splashing up or simple road spray and flying debris is another matter. It may not make it all the way to the turbo, but it theoretically could block the exhaust some and cause excess back-pressure.
I, too, don't buy the wind down the pipe spinning the turbo story. Water splashing up or simple road spray and flying debris is another matter. It may not make it all the way to the turbo, but it theoretically could block the exhaust some and cause excess back-pressure.
