Engine cool down time ?
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Elder User
Joined: Sep 2006
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From: Middleton, Idaho
Engine cool down time ?
I have a question about engine cool down time. in my owner's manual it says to wait 7-10 minutes before shuting her down after extended high speed or maximum GVW operation.
I haul trailers in my line of work and even when I am not hauling trailers I spend alot of time on the hi-way.
My friend just had his turbo replaced and the mechanic says it was because he didn't allow for proper cool down time. He is now installing a device that will shut down the engine only after it reaches the proper temp for shutting down.
I have a 99 7.3
Thanks
Jeff
I haul trailers in my line of work and even when I am not hauling trailers I spend alot of time on the hi-way.
My friend just had his turbo replaced and the mechanic says it was because he didn't allow for proper cool down time. He is now installing a device that will shut down the engine only after it reaches the proper temp for shutting down.
I have a 99 7.3
Thanks
Jeff
Elder User
Joined: Aug 2005
Posts: 763
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From: Dallas, Texas
If you have an EGT monitor, wait till' you see 270 then kill it.
Rule of thumb is:
If driven for more than 15 minutes and see 10-15 psi - cool down for 2 minutes (or 270)
If driven long distance load or no load (over 15 minutes) - 270 degrees.
If you have a good air filtration system and bigger exhaust, cool down will happen quickly - unless your AC is on, then it may take several more minutes.
Rule of thumb is:
If driven for more than 15 minutes and see 10-15 psi - cool down for 2 minutes (or 270)
If driven long distance load or no load (over 15 minutes) - 270 degrees.
If you have a good air filtration system and bigger exhaust, cool down will happen quickly - unless your AC is on, then it may take several more minutes.
Senior User
Joined: Sep 2006
Posts: 351
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From: In the Georgia Pines
i've heard of similar issues. i always let mine idle for a minute or 2 after driving it. i dont tow anything. i think that you may want to let the turbo cool down for a few minutes after hard driving or towing so the oil doesnt coke on the turbo bearings.
One rule of thumb is to watch the EGT gauge and when the temp's go down near regular idle temps then i'd shut it off.
hope this helps.
One rule of thumb is to watch the EGT gauge and when the temp's go down near regular idle temps then i'd shut it off.
hope this helps.
Post Fiend
Joined: Jun 2004
Posts: 9,293
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From: Parker, CO
The reason for the cooldown is the "coking" effect that oil has on hot turbo internals. After shutting the engine off, the flow of fresh oil to the turbo has stopped. Hot oil in the turbo will actually cook and leave deposits. Over time this damages a turbo and shortens the lifespan.
You have to look at other factors though, since not everyone allows their truck to idle down and not every turbo is lost due to coking. Frequency and type of oil changes can make a difference. Fresh oil will leave less deposits, as well as synthetics which cook at a higher temperature.
You have to look at other factors though, since not everyone allows their truck to idle down and not every turbo is lost due to coking. Frequency and type of oil changes can make a difference. Fresh oil will leave less deposits, as well as synthetics which cook at a higher temperature.
Senior User
Joined: Sep 2006
Posts: 351
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From: In the Georgia Pines
http://www.xtremediesel.com/index.as...ROD&ProdID=266
Turbo lifesaver. good product from what i hear.
Turbo lifesaver. good product from what i hear.
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From: Middleton, Idaho
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FTE Leadership Emeritus
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From: Cabot, Arkansas
Without gauges a 1-2 minute wait will get you down around 300-350 which is cool enough to prevent coking. The exception is towing or running it exceptionally hard, then give it 4-5 minutes.
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Post Fiend
Joined: Feb 2006
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From: Middle Tennessee
Yeah, I would invest in the gauges before the t-lifesaver if I didn't have any. You can then watch and decide when to shut off the truck. Of course if you just don't want to be bothered with it for a minute or 2, then the lifesaver is for you.
If you don't want to bother with any of the above and know you've been working the rig hard on a warm day, just let it idle for 3 minutes and shut it down. Mine has never taken even that long under the worst conditions (watching EGTs), so even with stock intake and exhaust, that should be safe.
Edit: man did it take that long to type that? I guess that's what happens when you multitask, AKA try to watch TV and type.
If you don't want to bother with any of the above and know you've been working the rig hard on a warm day, just let it idle for 3 minutes and shut it down. Mine has never taken even that long under the worst conditions (watching EGTs), so even with stock intake and exhaust, that should be safe.
Edit: man did it take that long to type that? I guess that's what happens when you multitask, AKA try to watch TV and type.