How long to let a 5.9 cummins warm up? - Dodge Cummins Diesel Forum
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post #1 of 25 (permalink) Old 01-04-2011, 11:13 PM Thread Starter
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How long to let a 5.9 cummins warm up?

I have a 01 3500 cummins. I live in central texas so temps arent all that cold, question is, if i leave the block heater pluged in all night, how long should i let the truck idle in the morrning before i drive it? what are the warm up times depending on temperatures? can leaving the block heater pluged in for extended amounts of time harm anything? Also any other cold weather tips would be appreciated. Im mainly concerned about the longevity of my engine so any suggestions or comments would be appreciated.


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post #2 of 25 (permalink) Old 01-04-2011, 11:19 PM
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Originally Posted by The Dirty Dodge Dually View Post
I have a 01 3500 cummins. I live in central texas so temps arent all that cold, question is, if i leave the block heater pluged in all night, how long should i let the truck idle in the morrning before i drive it? what are the warm up times depending on temperatures? can leaving the block heater pluged in for extended amounts of time harm anything? Any other cold weather tips?
I leave my block heater plugged in all night if i know its gonna be cold the next morning, even if its not gonna be below freezing cause it helps that heater warm up faster lol. I drive about 7 miles to work and my truck is just getting warmed up when i get to work on a say 30's or so degree morning.

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post #3 of 25 (permalink) Old 01-04-2011, 11:22 PM
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I just let it build oil pressure, and let the grid heater finish cycling and drive easy. Truck is up to temperature under 10 miles. FWIW "cold" here is below 40*

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post #4 of 25 (permalink) Old 01-04-2011, 11:29 PM
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I let it warm up enough so the ps pump quits complaining unless I'm in a hurry. I'll replace it if it breaks.

2000 LWB, Quad Cab, 4x4, NV4500, AirDog, Gauges, Thuren Track Bar, Lost crappy AGR and A1-Cardone steering boxes. RedHead is the best so far but truck has stopped returning to center. Hopefully, I'll get to it soon.
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post #5 of 25 (permalink) Old 01-04-2011, 11:36 PM
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Drive it like a gas engine. Every owner is different. Ive seen guys jump on dozers and backhoes and instantly go to full rpm's and push dirt, for years. I think todays engines are built for buisy working people.

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post #6 of 25 (permalink) Old 01-04-2011, 11:44 PM
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I let mine idle as long as I can before all the lights are on at the neighbors on both sides of my house

I hate being "that guy" with the obnoxious vehicle so I find myself driving driving it much colder than I'd really like to. I just take it really easy and don't coax it into 4th at low speeds like I do when it's warm

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post #7 of 25 (permalink) Old 01-04-2011, 11:46 PM
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Originally Posted by wontgoslo View Post
Drive it like a gas engine. Every owner is different. Ive seen guys jump on dozers and backhoes and instantly go to full rpm's and push dirt, for years. I think todays engines are built for buisy working people.
I've seen that too. I highly reccommend letting anything warm up to operating temp before getting on it.

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post #8 of 25 (permalink) Old 01-04-2011, 11:52 PM
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i had the same question about thanksgivin when it got cold here cause my fuel heater went out until i got it fixed and the dealership said it would be fine to plug it in every nite all nite if you want to, but not much over 50 degrees tho
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post #9 of 25 (permalink) Old 01-04-2011, 11:53 PM
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Well if your going for longevity, and taking care of your rig. I would suggest letting it warm up to 160. Also a high idle feature is nice because it puts the motor in a smoother rhythm. Your water temp is always higher then your oil temp. at first start up. So letting your water temp get up to running temp for several minutes before working the motor hard. Essentially your oil pressure is always higher when you first start your truck for the day be cause its cold. You'll notice where it is when its warm and where it is when its cold. I think by letting everything get to ideal temp it will increase your truck life significantly.

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post #10 of 25 (permalink) Old 01-05-2011, 01:04 AM
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I let the clutch out as soon as the oil pressure is up but speed limit/easy driving until it hits 190F.

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post #11 of 25 (permalink) Old 01-05-2011, 01:20 AM
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I let it idle for 2 minutes, the keep the rpm's under 1500 until it hits about 170.

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post #12 of 25 (permalink) Old 01-05-2011, 01:24 AM
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idling one of these things to 160* every time you drive it is a good way to accelerate wear on the rings...

these engines are meant to be worked, not idled... idling a cold diesel is NOT good for it
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