Do you need to cool the turbo down at the end of a haul

[VHolloway]

I know a lady thats has a 6. 7 cummins and she thinks it's ok not to cool down the turbo after driving. I cool my 99 ram down every time we drive it it's a good habit to fall into. but this lady has a know it all friend we will call her BEV THATS HER NAME i try to help the lady with 07 ram but bev being the know it all that she is tells this lady i'm full of **** .

ok my take on these trucks are use a good syn oil and cool down that turbo

DOES THE OWNERS MANUAL ON A 07 TELL YOU ABOUT A COOL DOWN OF THE TURBO. PLEASE HELP ME PUT THIS KNOW IT ALL IN HER PLACE. THANKS

PS. IT'S CALLED TURBO COKING

 

[Wygate]

I cant say for sure on the truck (I have no proof), what i can say is all of the boats and ships I have driven in the last 20 years get a minium of a 10 min cool down before shut down. That said the same issues lie with our trucks so I say yes and do it (cool down) every time I work it even remotely hard i put it in high idle for a few before shut down.

Thats my 2 cents

 

[jgillott]

I cant say for sure on the truck (I have no proof), what i can say is all of the boats and ships I have driven in the last 20 years get a minium of a 10 min cool down before shut down. That said the same issues lie with our trucks so I say yes and do it (cool down) every time I work it even remotely hard i put it in high idle for a few before shut down.

Thats my 2 cents

Does you owner's book have a section on cool down times based on use like the 5. 9L trucks did?

 

[TLane]

From page 280 of the owners manual for my '08:

 

[Jim W]

In the 08, O and M guide the manual provides a time line for shutting down the engine. I believe that you should wait at least 5 Min's before shutting down the truck after towing a load. That is the maximum time required for shuting down.

I use a EGT gage and wait for the EGT's to cool until 400 F. The 6. 7L engine and turbo have been designed to operate at a higher temp's then the old 5. 9L engines. When I had my EGR and DPF hooked up, I would see at least 650F during shut down. The turbo is now water cooled and with the emission equipment installed you can shut down around 650F if a gage has been installed, or wait the 5 minutes to cool down.

Jim

 

[VHolloway]

Oil will still coke at 400 how much longer will it take to bring it down to 250 -300 range.

Better safe than sorry don't be in such a rush to get out of the truck

 

[Edgemann55]

Install a egt gauge and your days of guessing will be over. Cool down time depends on outside temps- how hard the run-what you are pullin. Best thing you can do for these rigs is install Egt,trans temp and boost gauges. A fuel pressure is nice to have too.

 

[sag2]

The chart is a good reference to follow if you don't have a brain. Unfortunately the manufacturer has to treat us all like we have no brain for the small percentage who really don't.

If you just pulled a six percent grade and stopped at the top of the hill with 25,000 combined weight, let it idle for five minutes. If you pulled the same six percent at the same load but the rest stop is one mile down the other side of the grade (off the throttle all the down) shut it down immediately unless it's 110 degrees out.

I almost never let mine idle because when I stopped (except for a rest stop, very heavy load, etc) I idled through the neighborhood, parking lot, etc. long enough that the exhaust temps were down by the time I shut it off.

So pay attention to what your doing, use common sense, use good oil, change it often, and your engine and turbo will last a very long time.

 

[MrLuckey]

Oil will still coke at 400 how much longer will it take to bring it down to 250 -300 range.

Yup but as he mentioned... its water cooled now, not oil.

 

[VHolloway]

IF you read page 280 of the owners manual

oil still lubricates the bearings yes it cooled by coolent as well but oil will coke at 400

there are people that don't give a dam and want to take the time to cool the turbo.

for those that do cool it down 250-300 to each his own

read your owners manual

i put in a call to a injection pump and turbo shop in west palm beach the guy told me yuppies are his bread and butter they drive these diesel trucks like a car. they jump in hit the starter with no fuel pressure before the light comes on that fires up the lift pump up he was telling me over time it takes out the injection pump and the not cooling down the turbo but he sees older trucks out of warranty he told me wait untill you hear a buzz then hit the starter

it does fire up much faster i tryed it. i guess it prusserizes the fuel line it makes it fires off faster

it makes this guy vary happy when people don't take care of there truck rite

it is what it is.

 

[mxaaron]

I had ISSPRO gauges on my 01. 5, and here is typically what I saw.



In normal driving, the pyrometer would be under 350 by the time I got in the driveway, stopped, set the parking brake, and went to shut it off. When pulling, it would cool itself much quicker than you would think it could. Not to mention the fact that it is quite surprising how fast and how much your EGT's can fluctuate based on the amount of fuel you are pouring to it, the amount of boost you are pushing into it, and how hard you are working it. Yet take your foot out of it, and it cools itself extremely quickly.



As you can see by the dummy chart in the book, 5 mins for the worst of the worst. I never had mine take that long to get to 300 for shut down, again, they are asking you to play it safe. Excessive Idling is not good either though. As far as your comment on letting fuel pressure "build," Here is what I would see on that guage.



I would turn the key on, the gauge would shoot to about 15psi, and then slowly drop UNTIL I started cranking. Then I would get 17 lbs. (I had a BD Flowmax lift pump. ) I don't think that your pressure will increase the longer you wait to crank. I never saw that.



I have found a lot of guys tell me a lot of stuff, and just because he is a mechanic doesn't mean he is infallible. This was my first hand experience. Just saying.



Maybe if you really want to prove that "know it all" wrong, you should go out and spend 800 bucks on some gauges, and then just take her for a ride.

 

[VHolloway]

IT'S her truck if she want's to listen to some old mean know it all woman let her.

It's a shame thats a real nice mega cab. I was just trying to help but what are you going to do? we baby our truck. but to each his own.

i think we all know a BEV a loud mouth know it all

all i can say is GOOD LUCK MARY AND THATS A REAL NICE LOOKING TRUCK.

AND MIND MY OWN DAM BUSINESS!!!!

 

[RVTRKN]

The chart is a good reference to follow if you don't have a brain. Unfortunately the manufacturer has to treat us all like we have no brain for the small percentage who really don't.

If you just pulled a six percent grade and stopped at the top of the hill with 25,000 combined weight, let it idle for five minutes. If you pulled the same six percent at the same load but the rest stop is one mile down the other side of the grade (off the throttle all the down) shut it down immediately unless it's 110 degrees out.

I almost never let mine idle because when I'm stopped, (except for a rest stop, very heavy load, etc) I idled through the neighborhood, parking lot, etc. long enough that the exhaust temps were down by the time I shut it off.

So pay attention to what your doing, use common sense, use good oil, change it often, and your engine and turbo will last a very long time.

That is how I judge when it is time for shut down, but I never shut my truck down during rest stops or a 5 min quick trip inside a store. When towing heavy, it is common for me to arrive at a camp ground which I Idle at registration and then very slowly drive to RV spot, so no cool down required. The oil cooled turbo's are more important than the 6. 7 water cooled turbo's for shut down time, especially after climbing a grade. The 5. 9 turbos can actually glow from the heat, when the water in the 6. 7 dissipates the heat more easily. BUT COOL DOWN IS ALWAYS REQUIRED