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Old 04-18-2013, 11:32 AM   #11
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I'm on the diesel place forum. Lot of knowlege there, but a few misguided guys as well. Dont call anyone an "expert".

The purpose of cooling down a turbo is to make sure any trapped oil in the bearing dont cook. This can be detrimental to turbo life. I have a pre-turbo exhaust gas temp gauge on my Excursion. I will not shut off my engine with EGT's above 350 degrees. Even after the hardest pull, it only takes about a minute for the heat to decay. Usually, the creep thru my subdivision is enough to do it, and I dont have to wait at all.

the one thing you don't Don't DON'T want to do is rev the engine before shutting off the key. That will spool up up your turbo and it will coast down with no oil pressure. A neighbor had his new (to him) dodge for just over a year. Its got less than 60K miles on it and he already replaced the turbo once. He revs the snot outta anything he drives and shut the key off. You can hear his turbo winding down for a good while after he shuts it off.

My Exy has 188K miles on it, on the original turbo. You don't have to go nutso and idle it for 10 minutes every time you shut it off, but a minute of cooldown/spooldown goes a long way.

BTW, Idling a diesel is not harmful to it at all. even for extended times.

Tim
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Old 04-18-2013, 11:46 AM   #12
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Since all of you seem to be mechaniclly superior to me I have a question. Does the Duramax engine need to be tuned up like the gasaline engines and what are some of the signs to look or listen for to let you know there is a problem?
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Old 04-18-2013, 11:51 AM   #13
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lindy My 7.3 diesel's wastegate does not open until I have 12.5 psi of boost on the system. You still need to only idle a diesel until the hot oil is pumped out of the turbo and it has spun down. Exit ramp and driving into parking is usually enough time for ours to spin down and EGT's cool down enough to shut down. Main thing is to check EGT's before shutdown or it can cook the oil in the turbo.
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Old 04-18-2013, 11:54 AM   #14
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Red face I am not a mechanic

What about a tune up on a Duramax? What should be done or should anything other than serviceing the engine?
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Old 04-18-2013, 12:10 PM   #15
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What about a tune up on a Duramax? What should be done or should anything other than serviceing the engine?
Follow your service manual. No tune up needed if not listed there.

I let my diesel cool down to 400 or less before shutting if off.
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Old 04-18-2013, 12:23 PM   #16
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What about a tune up on a Duramax? What should be done or should anything other than serviceing the engine?
Only "tune up" practice would be to keep a fresh fuel filter on it.
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Old 04-18-2013, 12:25 PM   #17
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What about a tune up on a Duramax? What should be done or should anything other than serviceing the engine?
Diesels don't need much. Filters. On mine, I clean my MAP and MAF sensors. Don't know if the Duramax have them.
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Old 04-18-2013, 02:12 PM   #18
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Thanks

Thanks for the information. My service guy usually changes filters when we change oil about every 5K.
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Old 04-18-2013, 04:04 PM   #19
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Rule 1. Always follow your manufacturers recommendation for your particular truck
Rule 2. Verify what you read on forums. I belong to the Ford Truck Enthusiast site and there are a great many experts on there. For every expert there are a few who are....not so much an expert.
Rule 3. See Rule 1.
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Old 04-18-2013, 04:23 PM   #20
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The manual for your truck is probably the best place to be looking.

The diesel supplement for my 2012 F350 DRW LB states : "to prolong engine life (especially after extended high speed, high ambient temperature, or high GVW/GCW operation, such as heavy loads and/or heavy trailers), it is recommended that a hot engine be idled for 3-5 minutes which will allow the turbocharged engine to cool down."

If you follow what your manuals say you won't run afoul of any warranty issues either.
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