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Old 12-23-2017, 08:27 PM   #15
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The trucks are at high idle to power their air conditioner and other electrical systems when they spend the night in their sleeper.
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Old 12-23-2017, 08:40 PM   #16
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Or, for heat!
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Old 12-24-2017, 01:00 AM   #17
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Even the truckers aren't idling anymore. As stated, they were doing it in the past to run A/C or heat. Most of your new long haul trucks have a power unit that does their heating and A/C. They no longer need to have the main engine running anymore.

Keep in mind there are some people responding that have been doing things a certain way for 30 years. That was fine for older engines. New modern engines don't require idling or long cool downs. These old school guys are actually doing harm to a modern coach by doing what they did years ago.

It's hard to keep up with technology, but some should read the manuals in their new coaches with MODERN diesel engines.....talking 2010 or so and on.
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Old 12-24-2017, 05:13 AM   #18
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If a diesel idles to long the fuel does not burn like it is supposed to, the unused fuel can and will leak past your pistons and dilute your oil, and possibly glaze your cylinders, the fuel that does burn does not burn efficiently and will soot you emissions and cause issues. But you also don't just want to shut it down either, if you have been doing heavy driving, you want to idle the engine for 5 minutes to cool down the Turbo. If you do need ot let it idle longer you can set the high idle, on the cummins it jumps the RPM up to 1100 to 1500.

You will also want to keep your air filter clean, they say every so many miles (I believe 20-25K or every 2 years), I change mine every year with the oil and fuel filters. I know I don't need to but I feel better. If you let your air filter get to dirty you can dust your cylinders.
cleaning air filters and changing them frequently will put you at greater risk of dusting your engine over time. The majority of dust that enters an engine via the air filter is in the first few weeks of the filters life until it builds it's protective dust cake. This is why they have the filter minder. Do some research and you may decide to leave that filter alone.
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Old 12-24-2017, 06:59 AM   #19
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The Big Trucks idle because the driver does not own the truck usually. They are company drivers and are not paying the fuel bill. I own my semi and try and not idle. I have a webasto bunk heater for cold nights that only burns about a pint in 10 hrs vs a gallon a hour for the big engine. If it is super cold outside I will idle truck to keep fuel from gelling or to use A/C if it is super hot. I sleep better with everything off. Nothing expensive can break when it is not in use. If it breaks tomorrow at least I got a good notes sleep before having to deal with it!
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Old 12-24-2017, 07:09 AM   #20
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I know nothing about newer Diesel engines. I do remember in the past pulling into a truck stop late at night where several tractors were idling with the drivers asleep inside. Heard stories about dump trucks left idling all night in very cold weather because they were afraid they would not start in the morning if they shut them off. Years ago diesel fuel was about half the cost of gasoline so that did not present much of a problem.

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Old 12-24-2017, 07:48 AM   #21
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This topic is always very opinionated and different views from all walks of life. I feel compelled to say I don't idle my rv in a campground more than five to ten minutes for warm up. Usually enough time to get cord and hose reels in, air up and bring in the slide. If coming off a highway I will idle ten minutes before any shut down.

I should try to find my other thread. In idling down a hot motor there is more to consider than just egt. Transmission fluid and hydraulic fluid, internal components etc. After a hard run other components are still cooling down even though the egt has cooled down and maybe water temp has stabilized. These are the things we don't see. Piston tops and rings, valves in the head, head etc. Also the transmission... The clutches get shifting as opposed to staying locked on the highway etc. Ten minutes should be adequate to cool all components but I will say this. I am not the guy who warms up or idles down more than 5 or 10 minutes in a campground nope. But when I am on the road if I stop for fuel or whatever she never shuts down. If I stop for the night at a truck stop yes she shuts down. I also know the newer engines with the dpf are not wanting to idle much at all.
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Old 12-24-2017, 08:24 AM   #22
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Even the truckers aren't idling anymore. As stated, they were doing it in the past to run A/C or heat. Most of your new long haul trucks have a power unit that does their heating and A/C. They no longer need to have the main engine running anymore.

Keep in mind there are some people responding that have been doing things a certain way for 30 years. That was fine for older engines. New modern engines don't require idling or long cool downs. These old school guys are actually doing harm to a modern coach by doing what they did years ago.

It's hard to keep up with technology, but some should read the manuals in their new coaches with MODERN diesel engines.....talking 2010 or so and on.
Even the manual for my 58 year old loader with a detroit diesel states not to idle for more than 5 minutes. I will let it idle for a couple of minutes to warm up and then take it easy till the temp gauge starts to move. I give it a minute or 2 to let it cool down after working it. Had no problems with that engine or any of my equipment.
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Old 12-24-2017, 08:24 AM   #23
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UPS drivers shut theirs down at every stop even if the package recipient is standing in the yard. That's a lot of restarts in a day.
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Old 12-24-2017, 11:42 AM   #24
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Good way to NOT make friends with those camped around you, since the fumes and noise will likely make their way into everyone else's coach.

Had a knucklehead parked next to us at Thanksgiving with a diesel Chevy truck that thought he needed a 15 minute idle warmup every day about 8am - not cool.
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Old 12-24-2017, 11:43 AM   #25
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Rented a Penske 26' Box and their tow dolly to move intrastate. When loading the car onto the dolly the truck shut off on its own. Not sure if this was the engine mfgr or Penske's design spec. Not sure if it matters but it had the DPF and DEF tank.
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Old 12-24-2017, 11:54 AM   #26
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No matter the logic and reasoning to shut down a diesel within 3-4 minutes of leaving the highway or starting to move as soon as the air pressure is up, there will be some who think their way of idling for ten minutes before and after is better. They probably are not going to change even though the engines have.
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Old 12-24-2017, 12:03 PM   #27
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I really don't care the why's and wherefore's of idling a diesel, I don't want to hear the noise. My Duramax isn't very loud but I try to minimize the noise for my neighbors.
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Old 12-24-2017, 12:12 PM   #28
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cleaning air filters and changing them frequently will put you at greater risk of dusting your engine over time. The majority of dust that enters an engine via the air filter is in the first few weeks of the filters life until it builds it's protective dust cake. This is why they have the filter minder. Do some research and you may decide to leave that filter alone.
What??????? Where exactly did you hear this?
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