How important is it to seal the exhaust on a 4620 when having it hauled by truck? Several years back I was told that when hauling such tractors that the turbo can be damaged due to air movement spinning the turbo while the engine is not running and that sealing the exhaust would prevent this from happening. I just bought a 4620 and will be hiring it hauled 350 miles to its' new home.
- Thread starter telnorth
- Start date
I think the sealing the exhaust before you transport because the turbo will spin is an old wives tale. I can understand the theory that the air flowing across the stack could cause air to flow and spin the turbo, but where is the air going to come from? Even if the engine has stopped with an intake AND exhaust valve open on the same cylinder I think your air cleaner and the probably partially open valves will cause to much restriction to allow much flow. I work at a plant that makes motor homes, the exhaust pipes on the diesel units are not sealed in transit to us.
I would however consider sealing the exhaust pipe so "stuff" doesn't get in the system that might cause you grief. By stuff I'm referring to all manner of Flora and Fauna as well as any road FOD that might find it's way into the stack. Currently there is a pretty good post on what was your strangest mechanical malady you encountered. A lot of them are about things that found there way into places those things should't be and the resulting mayhem that was created.
I would however consider sealing the exhaust pipe so "stuff" doesn't get in the system that might cause you grief. By stuff I'm referring to all manner of Flora and Fauna as well as any road FOD that might find it's way into the stack. Currently there is a pretty good post on what was your strangest mechanical malady you encountered. A lot of them are about things that found there way into places those things should't be and the resulting mayhem that was created.
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
JD Waterloo factory employees back in the 80's didn't think it was a "wives tale" as tractor must have a furnished red plastic plug installed in muffler on a turbo'ed tractor before the 18 wheeler I was driving hauling new JD tractors from JD Waterloo factory parking lot was allowed to leave!!!!!!!!!!
I agree, the chances of a turbo spin from hauling is nearly impossible if not totally impossible. An engine would have to stop at top dead center so ONE set of valves would be on overlap (.010 - .015). I have yet to see a diesel stop at TDC on any cylinder. If by chance (nearly impossible) an engine stops at TDC the airflow through the overlap valve is not enough to spin a turbo. Having worked on many turbo diesels, and have the air inlet pipe off, I have never seen a turbo spin with cranking speed air through it, only when it fires up does the turbo even think about spinning. Now I know I will flamed here, but these are my observations in 40 plus years of diesel engine repair. Now I do like to see the exhaust taped off if the diesel engine machine is being hauled long distances to keep rain and other highway chunks and dirt from entering the exhaust.
larryanderson
Well-known Member
I always cover the stack just in case as if something goes wrong it not my fault.I don't like furnace tape that is commonly used as it leaves residue when removed that is difficult to remove.
Thanks to all for the advice. This tractor has a exhaust rain cap with the hinge towards the front of the tractor. I'll request that the tractor be placed facing forward on the trailer and that they make a reasonable and safe effort to tape up the rain cap.
I agree that if anything is is just a good move to tape up exhaust. I've hauled and taped up a few non-turbo'd 4020's and on those it was a bit of a spider man act to climb the side of the tractor to reach the top of the exhaust. More so I suspect with the taller exhaust of the 4620.
I agree that if anything is is just a good move to tape up exhaust. I've hauled and taped up a few non-turbo'd 4020's and on those it was a bit of a spider man act to climb the side of the tractor to reach the top of the exhaust. More so I suspect with the taller exhaust of the 4620.
fixerupper
Well-known Member
We hauled 8 2388 CIH combines many thousands of miles without taping the exhaust and never lost a turbo. They had short straight pipes right out of the turbo. Most of them had 6000 hours on them when they went away to a new owner. Sometimes they were hauled facing backwards which put the exhaust pipe right into the wind blast.
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