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Old 04-08-2011, 04:17 AM
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Question on shutting off and restarting

Maybe a stupid question here...

I always hear diesel motors running at idle verses shutting them off. If you are not driving anywhere for lets say, 5 to 10 minutes - should I shut the motor off or let it run at idle?

I know that starting a motor is tough on them with the first few rotations not having proper oiling in the rotating assembly and all. What is a good rule of thumb with our motors to just leave them running?

Thanks in advance,
Mike
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Old 04-08-2011, 06:25 AM
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IMHO just shut it off. also makes it harder to steal.
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Old 04-08-2011, 06:28 AM
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Depends on what time of year it is for me, also what I have been doing. If it is winter and I am stopping somewhere I will let it run, if it is summer time and I know I will be there longer than 5 minutes I will shut it off, that is unless I have the air on and am going to be getting back in and driving a ways and want to keep it cool. This does however depend on if I have been towing one of the big trailers, b/c if I have then I will let it run regardless of time of year. I guess it really all boils down to the situation and what your personal preference is. Some guys will say with fuel getting so expensive shut it off and save money, however letting it idle for 5-10 minutes is only going to use a few cents worth.
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Old 04-08-2011, 06:36 AM
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motor considerations only not your comfort i would say if it is cold and its gonna be 5min, let it run. any more shut it off. if its warm outside as long as the turbo isnt hot go ahead and shut it off. but if you have been doing some heavy towing or hard driving you need to let the turbo cool before you shut it off anyway in that case you might as well let it run.
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Old 04-08-2011, 11:16 AM
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If you have gauges, I let my EGTs get down to 300 before I shut it down. Which doesn't really take that long. I can get it down to 200 but it will take a few minutes.
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Old 04-08-2011, 11:30 AM
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Quote:
Originally Posted by AgentAustin View Post
If you have gauges, I let my EGTs get down to 300 before I shut it down. Which doesn't really take that long. I can get it down to 200 but it will take a few minutes.
i cant stand waiting that long but below 400* is acceptable so i usually shut down at 350, and my turbo still lives, so i guess that says somethin.
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Old 04-08-2011, 12:20 PM
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Thanks all for your inputs !

I will let it idle for 5 minutes or so... But look at EGTs for the temps and not shut it down early if they are up there.

It is funny to watch the EGT numbers as they fluctuate so much with acceleration and letting off the pedal. It is kind of fun to do so, lol.


Mike
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