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Old 09-26-2013, 03:11 PM
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Whining or moaning noise

I just recently noticed about 2 minutes after I shut my truck down a moan noise starts to develope and goes on for about 3 minutes. The sound seems to come from the rear of the valley near the turbo. I'm guessing its electrical because the truck is off. anybody experience this and get a diagnosis.
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Old 10-04-2013, 12:46 PM
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I wonder if these 6.7L trucks have a auxiliary electric coolant pump that runs after the truck is shut off if the turbo is too hot. I had a 1987 Porsche 944 Turbo that did, and it was to cool off the turbo after shutdown to prevent the bearings from burning the oil and coking up. I haven't paid that close attention on my 6.7L, have only had it a week but it doesn't make any obvious noises after shutdown from inside the cab.

Greg
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Old 10-11-2013, 08:05 AM
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On my truck after shutting it down I hear the DEF purge pump running for about 30 seconds but it is under the cab near the DFCM.
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Old 10-19-2013, 11:37 AM
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A guy I know just had his at the dealership for a a noise after the truck was shut down. I told him about the def pump and he said it was under the hood. They told him it was a harness or something and it was as a result of to much idling. Can't believe u can't idle these trucks like diesels are known for


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Old 10-19-2013, 12:03 PM
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Extended idling has never been good for diesels, even back in the olden days (pre-EPA mandates) extended idling would cause diesel to wash down into the oil. The only reason to idle a truck now would be to keep the cab warmed up when it's -30 degrees outside or if you have a PTO and need to use it while the truck is stationary.

I shut mine down any time I expect to be sitting more than 3-4 minutes.

Greg
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