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Old 04-29-2016, 02:37 AM   #1
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Idling

I've heard from some Sprinter owners that prolong idling is bad for the diesel.

If anyone have a technical experience - is it okay to idle for two-three hours?

Thank you!
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Old 04-29-2016, 04:18 AM   #2
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There used to be a high idle option for the earlier sprinters, don't know if the newer ones have that. Extended idling is generally bad for the newer diesels.
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Old 04-29-2016, 04:20 AM   #3
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Can you briefly explain why?
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Old 04-29-2016, 04:38 AM   #4
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Go to the sprinter forums and use the search function.
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Old 04-29-2016, 05:49 AM   #5
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The owners manual says it can harm the emissions system. I've also read,but find hard to understand, that it can result in insufficient lubrication for the top side
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Old 04-29-2016, 06:44 AM   #6
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The owners manual says it can harm the emissions system. I've also read,but find hard to understand, that it can result in insufficient lubrication for the top side
Several things in play there. First, after lengthy idle time, the lube oil can thin to the point it no longer be pushed through the system in sufficient pressure to get to everything at the furthest point from the pump. Also, some things are "splash lubed", and may not get sufficient coverage at low speed. "splash lube" parts would be valves that only get the oil that flows across the valve train, and onto the top of the valves, to run down them and lube the stems.
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Old 04-29-2016, 07:11 AM   #7
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Avionstrem, go there yourself.

Overlander, thank you for the detailed explanation!
I've also heard the Particulate Filter may clog once at prolong idling?
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Old 04-29-2016, 07:17 AM   #8
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The reason why the emissions system can be damaged is a phenomenon known as "wet-stacking." You don't see it much on vehicular diesels, except semis that idle overnight while the driver sleeps. Normally you see it on diesel generators that are under-loaded. You get incomplete combustion— and lower exhaust temperatures— leading to a buildup of carbon compounds in the exhaust system, including on the exhaust side of the turbocharger as well as in the exhaust treatment system.

It's called wet-stacking because semis and many generators have a vertical exhaust stack.
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Old 04-29-2016, 07:46 AM   #9
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The reason why the emissions system can be damaged is a phenomenon known as "wet-stacking." You don't see it much on vehicular diesels, except semis that idle overnight while the driver sleeps. Normally you see it on diesel generators that are under-loaded. You get incomplete combustion— and lower exhaust temperatures— leading to a buildup of carbon compounds in the exhaushut system, including on the exhaust side of the turbocharger as well as in the exhaust treatment system.

It's called wet-stacking because semis and many generators have a vertical exhaust stack.
I don't have to go there because I've already read it. You need to do some of your own research, you'll find it illuminating.referring to post 7
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Old 04-29-2016, 08:08 AM   #10
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I don't have to go there because I've already read it. You need to do some of your own research, you'll find it illuminating.referring to post 7
Did you mean to quote me in that reply?
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Old 04-29-2016, 08:08 AM   #11
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Idling

The reason they used to say prolonged idling was bad is because when combustion temperatures drop in prolonged idling, the fuel does not burn completely and it washes the oil off of the cylinder walls causing rapid piston, ring, and cylinder wall wear, and even scuffing in extreme cases.

Additionally, common sense says Incomplete combustion is going to cause issues with particulate filters etc.

That said, back in the day when I spent a lot of time in trucks, I idled them overnight anyway, but I would bring the engine up to about 1,000 rpm.


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Old 04-29-2016, 08:12 AM   #12
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Lower exhaust temperatures associated with idling have more particulate in the gas stream due to incomplete combustion. Over time that causes problems for the emissions controls items. The "high idle" generated higher temperatures to burn this off, just like normal driving.


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Old 04-29-2016, 08:13 AM   #13
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Sorry for redundant answer.....my screen did not show all of the responses given.


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Old 04-29-2016, 08:15 AM   #14
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Sorry for redundant answer.....my screen did not show all of the responses given.
Don't apologize. Multiple people independently providing the same answer just means the answer is more likely to be correct.
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