Do you leave your diesel running ...?

My two cents, if I'm just fueling up and will be at the truck/pump it stays running. If I'm going the check the oil or go inside the truck gets shut down.

As Hannibal said, there is no need to let the turbo cool down if you drove at surface street speeds for a few blocks. Unless you just pulled a hard grade and rolled right in to a fuel stop, outlook or whatever.

Don

Turtle n Peeps wrote:
I must be one lucky SOB.


I wonder what the Eboost soccer moms are doing? LMAO Do they wait the required 5 minutes before shutting their twin turbo trucks down? LOL.

:S

Ford makes no recommendation on shutting down their gas engine trucks. The diesel engines are as stated in my previous post. I guess the manufacturer is the one to give the correct advice.

I must be one lucky SOB.

I've had and ran turbo's since the 70's and have only waited a handful of times to shut my engine down. Never had a turbo problem.

I was always been warned by the "Tommy trucker" types to never drive my diesel or gas turbo engine like a gas engine. What ever that means? :R

The turbo's are going to coke, the turbo's are going to fail, your engine is going to last about a thousand miles if you don't do this or don't do that.

And this is back in the sleeve bearing oil cooled era not the fancy ball bearing coolant cooled era like we have now. Oh and heaven forbid, all of these turbo's have had dino oil run through them. OMG, you're not running synthetic oil???!!!

I wonder what the Eboost soccer moms are doing? LMAO Do they wait the required 5 minutes before shutting their twin turbo trucks down? LOL.

How many of you pull over and check your lug nuts every 50 miles like the sticker says? :S

Anyone else notice the Cummins exhaust smells better than the others?

Not nearly as obnoxious when idling, which is obviously overdone.

Just a little more detail on my previous post. A turbo charger can spin at over 100,000 rpm and get pretty hot - well over 1000 degrees F. Engine oil carries the heat away from the turbo and lubricates it. If you shut the engine off after a long, hard pull, the turbo is still spinning and it's still very hot. The oil in the turbo can break down and shorten the life of the bearings.

There's also an EGR cooler on some trucks. Exhaust gas is cooled and then injected back into the combustion chambers to reduce emissions when the engine is pulling hard. The cooling is done by circulating engine coolant through a cooler similar to a radiator. The EGR can get well over 1000 degrees. When you abruptly shut off the engine, the coolant stops flowing and boils off. It can cause the cooler to melt and allow coolant to enter the combustion chamber. At best you'll loose coolant and blow white smoke. At worst, the engine will hydro-lock and seize up. Either way, it's expensive to repair and easy to avoid.

dodge guy wrote:


Correct! I have a V-10, used to have a Dodge conv van but traded it in on the X. I am a certified diesel tech. and yes by the time you pull up to a fuel pump the truck is safe to shut down, unless your spooling up the turbo waiting in line!

Many people are not aware of how a diesel operates, so I can understand some of the misinformation I read here. this is usually why they post their "reasons" for allowing it to idle. the fact is it is not necessary, unless the gas station is at the top of a mountain on the side of the hwy with no vehicles in line and you pull right up, then yes, you need to let it idle for a few minutes.

I rarely wait in line, so that's not an issue.... Spooling a turbo isn't what creates the shutdown requirement, it's heat. A turbo will slow down by the time you pull up, which is the only thing your spooling comment refers to, but that doesn't mean it's cool.

If the exhaust is still 400-600° coming out of the turbo then it's too hot, and surely you should understand that. It takes a lot longer when towing for a turbo/exhaust to cool down than pulling over and stopping at the pump.

Engine oil wile coke if it sits in those temperatures, and without air or oil flow it wont take too long to heat up a bearing inside a turbo.

Most people don't watch EGT's after shutdown, and have no clue how much, and fast, they rise when a proper cool-down wasn't applied.

transamz9 wrote:

Most truck stops I stop at while traveling are right off the interstate and 90% of the time I can drive right up to a pump. I also run a pretty hot tune on a stock turbo so there are times I feel I need to let'er idle while pumping. You would be surprised at the people that tows with hot tunes so your assessment that it don't hurt to shut them down don't apply to all diesel trucks on the road.

Tuning not need apply :-)

My truck ran higher EGT's and took longer to cool-down with the stock tuning than it does now at over 130rwhp more than stock. Emissions have really driven the EGT's up, which has increased cool-down time.

Some turbo's are water cooled, but even then they still need a cool down.

dodge guy wrote:

AH64ID wrote:

rhagfo wrote:

dodge guy wrote:
The turbo is cool enough to shut down by the time you are at a pump or in the campground!

You don't have a pryo do you!
A lot of the time yes, but too often the temp is still up. When my EGT hits 300 degrees, then I shut down.

My thought as well. Campgrounds generally are enough to cool, but fuel stations rarely are IME.

Based on his sig he doesn't even have a diesel....or a dodge.

Correct! I have a V-10, used to have a Dodge conv van but traded it in on the X. I am a certified diesel tech. and yes by the time you pull up to a fuel pump the truck is safe to shut down, unless your spooling up the turbo waiting in line!

Many people are not aware of how a diesel operates, so I can understand some of the misinformation I read here. this is usually why they post their "reasons" for allowing it to idle. the fact is it is not necessary, unless the gas station is at the top of a mountain on the side of the hwy with no vehicles in line and you pull right up, then yes, you need to let it idle for a few minutes.

Most truck stops I stop at while traveling are right off the interstate and 90% of the time I can drive right up to a pump. I also run a pretty hot tune on a stock turbo so there are times I feel I need to let'er idle while pumping. You would be surprised at the people that tows with hot tunes so your assessment that it don't hurt to shut them down don't apply to all diesel trucks on the road.

The Mad Norsky wrote:
OK, here is my info right from the owners manual which came with my truck; 2014 Ram Cummins 6.7L diesel.

NO LOAD

Stop/Go around town - idle less than 1 minute to shutdown

LOADED

Depending on turbo temperature, anywhere from 3 to 5 minutes idle time.

And there you go. I knew someone that owned a Dodge would have the correct info. and this applies to just about any turbo car/truck.

AH64ID wrote:

rhagfo wrote:

dodge guy wrote:
The turbo is cool enough to shut down by the time you are at a pump or in the campground!

You don't have a pryo do you!
A lot of the time yes, but too often the temp is still up. When my EGT hits 300 degrees, then I shut down.

My thought as well. Campgrounds generally are enough to cool, but fuel stations rarely are IME.

Based on his sig he doesn't even have a diesel....or a dodge.

Correct! I have a V-10, used to have a Dodge conv van but traded it in on the X. I am a certified diesel tech. and yes by the time you pull up to a fuel pump the truck is safe to shut down, unless your spooling up the turbo waiting in line!

Many people are not aware of how a diesel operates, so I can understand some of the misinformation I read here. this is usually why they post their "reasons" for allowing it to idle. the fact is it is not necessary, unless the gas station is at the top of a mountain on the side of the hwy with no vehicles in line and you pull right up, then yes, you need to let it idle for a few minutes.

OK, here is my info right from the owners manual which came with my truck; 2014 Ram Cummins 6.7L diesel.

NO LOAD

Stop/Go around town - idle less than 1 minute to shutdown

LOADED

Depending on turbo temperature, anywhere from 3 to 5 minutes idle time.