Cooling it Down
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Laughing Gas
Joined: Jun 2005
Posts: 939
Likes: 1
Cooling it Down
Still learning about diesels and trying to make the V10 vs Diesel decision!
So at what point do you decide to let it cool down before turning the key off? and how long do you wait?
Im pretty much the guys who is putting up the steering column, cranking the key off and locking the door in almost pit stop fashion, heck half the time im almost in the store when the little lady is still unharnessing the seat belt and just exiting the vehicle.
Is this something you need to do every time or just when you get to a certain temp.
If one makes alot of small trips from one location to another (say walmart to the grocery Store then maybe back home again.) Must I wait to cool down each stop?
So at what point do you decide to let it cool down before turning the key off? and how long do you wait?
Im pretty much the guys who is putting up the steering column, cranking the key off and locking the door in almost pit stop fashion, heck half the time im almost in the store when the little lady is still unharnessing the seat belt and just exiting the vehicle.
Is this something you need to do every time or just when you get to a certain temp.
If one makes alot of small trips from one location to another (say walmart to the grocery Store then maybe back home again.) Must I wait to cool down each stop?
Senior User
Joined: Sep 2005
Posts: 157
Likes: 0
From: New Orleans
For short stops (run in and grab a coke or whatever), I just leave it running.
The only time I really give the engine an extended cool down time is when I have been on the highway, or the engine has been under a load for a while. Even then, it's not longer than a minute or so. I use it as a time to get all my crap back in my pockets.
The point of the cool down (as I understand it) on turbo diesel engines is to let the turbo slow down to idle speed. The bearings need a bath of oil, and letting the engine run keeps them supplied with an oil supply. When the engine is under a load for a while, the turbo gets going pretty fast, so it takes a while for it to slow down to idle speed.
I don't find it to be cumbersome at all. Most of the time, just driving around town I can let the truck idle for 30 sec. or so while coasting into a parking spot. Ready to go, then.
The only time I really give the engine an extended cool down time is when I have been on the highway, or the engine has been under a load for a while. Even then, it's not longer than a minute or so. I use it as a time to get all my crap back in my pockets.
The point of the cool down (as I understand it) on turbo diesel engines is to let the turbo slow down to idle speed. The bearings need a bath of oil, and letting the engine run keeps them supplied with an oil supply. When the engine is under a load for a while, the turbo gets going pretty fast, so it takes a while for it to slow down to idle speed.
I don't find it to be cumbersome at all. Most of the time, just driving around town I can let the truck idle for 30 sec. or so while coasting into a parking spot. Ready to go, then.
Senior User
Joined: Nov 2005
Posts: 199
Likes: 0
cool down as it was origanily said to do was to let the turbo cool after working hard this was on the old trucks and if it didn't cool down the oil in the turbo would coke and ruin it on startup today this is not a big deal most do it out of habit the oil in todays engines are far better then they where when this was a problem
when u pull into say home and as soon as it hits idle the turbo is also idleing i doesn't need to slow down
the only time i would say it needs a cool down is when its had a hard run and especilly after its been chiped then the extra heat generated will need to be disapated from the turbo and pistons too but it should only take about 30 sec to a min depending on how hot the run was
when u pull into say home and as soon as it hits idle the turbo is also idleing i doesn't need to slow down
the only time i would say it needs a cool down is when its had a hard run and especilly after its been chiped then the extra heat generated will need to be disapated from the turbo and pistons too but it should only take about 30 sec to a min depending on how hot the run was
Postmaster
Joined: Jun 2004
Posts: 2,646
Likes: 1
From: Milky Way Galaxy
The Diesel Supplement (one of the manuals that came with our trucks) for the '04 6.0 recommends that "to prolong engine life," you allow the truck to idle for 7-10 minutes "after prolonged high speed or maximum GVW operation". I usually only let it idle to cool down after I've been driving at freeway speeds (70+ mph) for at least 50 miles and then only if I'm going from freeway to pulled-over without moving through surface streets at 30 mph. When I do have to let it idle to cool down I use a remote start and can press a button to keep the truck running for 8 minutes without having to be in it. I know some use their EGT's (I don't have a pyrometer so it's not an option) to determine how long to let the truck idle before they shut it off.
