covering exhaust or stack on equipment ?

I use a stack over no matter what. I hauled that dozer out of Dubuque, and when I delivered it, I asked the guy unloading it about covering exhaust on JD equipment. He said yes, and saw I had the stack cover on it. All was well.
We have had guys that got nailed with a turbo clause on the BOL after delivering. Not worth it for the 30 seconds it takes to cover it, old wife's tale or not.

Martin

 

They allow it, they just don't require it.

 

I always use duck tape to cover the exhaust. Keeps the turbo from spooling when going down the road. With out engine oil to lube it the bearings can potentially seize the turbine,.. or at the very least cause premature wear and end shaft play.

Hurst

 

I recently hauled 2 brand new JD farm tractors from one store to another and was asked to cover the exhaust. Same with 3 JD skid loaders I hauled a while back.

Hurst

 

The only time I didn't cover the exhaust is if I picked one up from a farmer bringing it into the shop when it was really cold and I'd actually leave it running, idled up to about 1500 rpm on the trailer.

 

You're kidding, right? If this is your actual line of thinking, no one is going to be able to explain well enough how an engine works to get you to understand how an engine and turbo interact. They aren't separate entities that just happen to be located near each other under the hood. The compressor side of the turbo forces air into the cylinder on the intake stroke, which then forces air back out through the exhaust valves and manifold through the exhaust side of the turbo, when running.

Considering valve overlap, and how little it takes to damage some of these newer diesels, probably a good idea to cover the stack. Maybe even on a truck if you're pulling it backwards, and the exhaust tips are oriented towards the back of said truck.

 

MF BOL's state that "ALL FORWARD FACING EXHAUSTS MUST BE DUCT TAPED".....turbo or no turbo LOL.

 

I agree with cpape it's a bit of an old wives tale. Sure there is not lubrication and in theory could cause trouble.

HOWEVER, a functioning turbo on a running engine spins at over 100,000 rpm's ! A little air blowing in the exhaust ain't gonna spin 100 rpm's, I don't care how fast you think you are.

FURTHERMORE, in order for that thing to keep spinning the air would have to keep moving. Once past the turbo it's gonna find closed exhaust valves or possibly a cylinder, the air has no place to go so how does the turbo keep spinning ?

ALSO, the fins aren't particularly well designed to collect air in reverse like that, they're scooped on the wrong side.

I would be curious if anyone has ever personally damaged one by not socking the exhaust ? Not "I heard of a guy" either.

 

Interesting thread. When I hauled new Caterpillar equipment in Europe they only required the exhaust of their 960 or larger loaders to be covered when transporting them with the exhaust facing into the wind.
It is very unlightly that any Tier 4 engine will have Turbo damage from transportation due to the DPF filter. Any of the dealers here in CA we haul for have yet to ask. However if someone asks or it's on a BOL I'd have no issue covering or taping the exhaust stack opening.

 

Yeah, I am thinking this is one of those "...because we've always done it that way," deals. And no one really knows for sure.