dozerduded6r
Member
Recently purchased a d6r and a 315c. When transporting between farms 30 miles apart, do I need to cover exhaust to keep turbo from spinning and if so why?
-
Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!
Covering Exhaust During transtit
- Thread starter dozerduded6r
- Start date
Lee-online
Senior Member
Yes.
Air flow will enter the exhaust, go through at least 1 open valve and out the intake. The spinning turbo normally rides on a film of oil. this centers the impeller and stops the bearing from wearing. Without the oil pressure of a running engine the impeller can rub on the housing and the bearing could wear some. Sure is safer to tape of bungee a bucket on the pipe.
Air flow will enter the exhaust, go through at least 1 open valve and out the intake. The spinning turbo normally rides on a film of oil. this centers the impeller and stops the bearing from wearing. Without the oil pressure of a running engine the impeller can rub on the housing and the bearing could wear some. Sure is safer to tape of bungee a bucket on the pipe.
masterwelder
Well-Known Member
A coffee cup fits right in our 312 bl exhaust...
motrack
Charter Member
I am going to watch this thread. The need to cover exhaust when trucking causes a lot of debate.
While air may enter a cyl thru a open exhaust valve that cylinder will NOT have a open intake valve to allow air flow out of the cylinder.
I have seen equipment trucked for years both with and with out the exhaust covered and have yet to see a turbo wasted by trucking uncovered. The turbos I did see the were claimed to have failed from windmilling were high hour engines and from the looks of the intakes were spiting oil for some time.
While air may enter a cyl thru a open exhaust valve that cylinder will NOT have a open intake valve to allow air flow out of the cylinder.
I have seen equipment trucked for years both with and with out the exhaust covered and have yet to see a turbo wasted by trucking uncovered. The turbos I did see the were claimed to have failed from windmilling were high hour engines and from the looks of the intakes were spiting oil for some time.
GOINGBROKE
Well-Known Member
- Joined
- Apr 28, 2007
- Messages
- 85
- Location
- WYOMING
- Occupation
- Diesel shop owner - truck, farm and heavy equipmen
As motrack said this will be interesting to watch. Whats the difference between hauling uncovered and a 40 mph wind, of which we have plenty of? Don't start very well if you dont uncover the exhaust first, seen that a time or two lol
tpitt
Well-Known Member
You both are right. I've hauled tons of equipment and it is an old wives tale.:Banghead Both valves in the same cylinder.would have to be open. If they are you already have major problems.
Both my brother and nephew are heavy haulers and they are in agreement.
DirtHauler
Senior Member
We did this debate once before, here is the thread. I still am not convinced that there is enough valve overlap to make the turbo spin backwords.
https://www.heavyequipmentforums.com/showthread.php?t=1498
https://www.heavyequipmentforums.com/showthread.php?t=1498
mitch504
Senior Member
One things for sure, if this really worked, I'd never have to buy an air filter. Every time one of my machines left the jobsite, there'd be a cloud of dust out the pre-cleaners.
Well the last place I worked... I was told to go move some equipment... Where's bobby...
the boss seen him hauling a loader without a sock over the exhaust... he's gone...
OK... so if the boss wants a sock on the exhaust then the boss get socks on the exhaust..
He signs the check... he gets socks.... whether it works or doesn't work...
all bobby could say was damm cell phone...the boss took a pic of the truck when he was leaving a job site..
the boss seen him hauling a loader without a sock over the exhaust... he's gone...
OK... so if the boss wants a sock on the exhaust then the boss get socks on the exhaust..
He signs the check... he gets socks.... whether it works or doesn't work...
all bobby could say was damm cell phone...the boss took a pic of the truck when he was leaving a job site..
mitch504
Senior Member
Excellent point heavylift; whenever I or one of my employees transport someone else's machine the exhaust IS taped. The operators manual for one of my CATs actually says that it is not neccessary except to keep debris from entering exhaust, but, if it's not mine, it is taped.
DPete
Senior Member
We always cover ours if facing the wind, the argument of wind not circulating thru the engine is valid but it wouldn't take much air movement to turn the impellar either. Doesn't cost much to cover it, I've had several truckers say it's not necessary, all I know is if it's covered it's not going to turn, most of our stacks are turned sideways so we haul uncovered.
Tiny
Senior Member
Hauling for hire I cover nearly all of them....Customer is always right lol and it removes the chance of someone saying "I lost a turbo and Dave is at fault
dozerduded6r
Member
My boss" son is the one moving the eqiupment around without covering the exhaust, but when something happens they blame the operator. ME! As much as these machines cost whats an extra 5 minutes and 2$ worth of duct tape.
mitch504
Senior Member
If so, the underside of your hoods must be black.
Exhaust leaving the cylinders is under much more pressure than air coming in.
2stickbill
Senior Member
I have hauled the Company Equipment uncovered.Never lost a Tubo.I did see one that was said to have been caused by no cover.But the Turbo was Blue on the inside.Running to hot and not letting it cool down before engine is shut off will get them.
Deerehauler
Well-Known Member
Most ag equipment (and I suspect construction equipment) has some sort of precleaner aspirator hose, which runs from the exhaust stack or muffler to the intake stack, ahead of the air cleaner. This hose is at least an inch in diameter. If the exhaust stack is pointed into the wind and the stack is acting as a wind scoop, the incoming air will take the path of least resistance. How much air would it take to fill the 1"+ hose, working its way through the turbocharger and out through either bad exhaust manifold gaskets or (grossly misadjusted) valves?
If your boss wants the exhaust stack covered, he signs the checks, and he gets his way. Is it necessary--NO. Is it hurting anything (other than wasting time and duct tape)--NO. For the record, I have been wrenching, hauling, and operating a fairly wide variety of brands and types of equipment and have NEVER had a turbo fail due to being hauled with an open exhaust stack. This has been my experience--yours may vary.
If your boss wants the exhaust stack covered, he signs the checks, and he gets his way. Is it necessary--NO. Is it hurting anything (other than wasting time and duct tape)--NO. For the record, I have been wrenching, hauling, and operating a fairly wide variety of brands and types of equipment and have NEVER had a turbo fail due to being hauled with an open exhaust stack. This has been my experience--yours may vary.
Will Musser
Well-Known Member
I'll cover them if I know I'm gonna get in rain on the trip. I just don't like the soot residue blowing everywhere. Otherwise i would rather leave them opem as I usually forget to take the tape off before trying to start the engine. Like Deere said, I't ismainly if the customer asks forme though. Technically it DOES NOT spin the turbo, that is a myth. The open pipe doesn't let enought air in to spin the turbo. If you dont believe me, the next time you have a down pipe off a turbo on a engine, blow on the exhaust fins. It will just sit there. Those fins a designed for the air to go the other direction across them. That is one (of many) reasons that hotside and coldside wheels look different in a turbo.
2stickbill
Senior Member
I had a retired diesel mechanic tell me that in diesel training school the instructor used a blow gun and 150 lbs of air pressure.Turbo would not spin.Besides that now you have mufflers that will slow wind speed down.Most or not straight threw.
masterwelder
Well-Known Member
Where are the Mythbusters when you need them?