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Old 02-11-2015, 02:32 PM   #113
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Originally Posted by Gordon Dewald View Post
Just spoke with a fellow who owned a Peterbuilt dealership.

Said he had a tour of the Cummins plant in Columbus.

Said they had a section whose job was to routinely pull an engine from the line and test it to failure using all kinds of extreme measures. Hot temps then immediately cold. Starting cold with heavy oil, different oil grades, etc, etc.

If Cummins says to cool it off then shut down that is what I will be doing.
One of my friends and fellow rescue divers is a supervisor in a section like you described in a plant in Ohio. His job is to take new engines off the line, and run them through different scenarios and try to make them fail. Then they slice them into pieces with some big hydraulic shears and throw them in a salvage bins. I consulted with him a lot when we were making our purchase. BTW, he gave a big two thumbs up for the ISM. I will get his opinion on this matter next time I talk to him.
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Old 02-11-2015, 04:32 PM   #114
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Originally Posted by frankdamp View Post
If you're in Washington State, it's illegal under state law not to shut down.
So is running 67 mph in a 65 mph zone Do you ever "Exceed" the posted speed limits
's...............
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Old 02-11-2015, 06:20 PM   #115
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OK I started this thread and I think I get the picture, Everybody do whatever you want, its your engine. I was just asking out of curiosity because one day while filling I saw that some folk idled and others did not. Thanks for all the help and opinions. I'm still lost as ever HA and will read my manual to see what Cummins suggests..
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Old 02-11-2015, 06:28 PM   #116
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OK I started this thread and I think I get the picture, Everybody do whatever you want, its your engine. I was just asking out of curiosity because one day while filling I saw that some folk idled and others did not. Thanks for all the help and opinions. I'm still lost as ever HA and will read my manual to see what Cummins suggests..
There was a ton of "What Cummins suggests" in the last 115 posts...........
They also sell a ton of replacement parts$$$$
Good luck in your decision
A "Bible" is read form an Alter, what people do after leaving the Church?
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Old 02-11-2015, 07:42 PM   #117
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OK I started this thread and I think I get the picture, Everybody do whatever you want, its your engine. I was just asking out of curiosity because one day while filling I saw that some folk idled and others did not. Thanks for all the help and opinions. I'm still lost as ever HA and will read my manual to see what Cummins suggests..
I guess in the end the engine run up around 200 degrees give or take, so the oil is easily able to handles those temperature, the turbo and exhaust is a different story, the are literally glowing hot if under a reasonable load never mind a severe 15 minute pull up one of Penn. fine hills on I81, so having welded, worked on my own cars, trucks skidoo and boats, the stuff does not cool down in a few minutes of idling, so if I burn 3,00 worth of fuel while I fill up before parking, that's what I feel is warranted base on my 40 years of experience and in this instance Cummins is not paying for my parts or repairs so I will do what my experience has taught me and let her cool down slowly with lots of oil running through her bearings and especially the turbocharger. for as long as I feel is needed, so shutting off is not wrong but running for 5-10 minutes doesn't hurt anything and likely helps. As far as pollution, in my instance my e test indicate an minimum of exhaust gases at temp, good enough to earn my unit a two year exemption because it runs that clean or exhausts less than 10 percent of the limit for exhaust which I expect is far less than most coaches and likely all trucks so not really a realistic concern.


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Old 02-11-2015, 08:00 PM   #118
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Paragraphs Moxy, paragraphs.

The vast majority of rv owners grew up on cars. Cars that rarely had turbochargers. They grew accustomed to being able to shut them off on a whim and restart them with ease. Repeatedly.

RV's, specifically diesel pushers simply can not be treated like that. You either have to educate yourself on what "oil coking" means, or take the word of those that do understand.

To replace a a car engine might cost $5,000, the diesel in your rv could easily run you into the $20K to $30K range. Remember, if "oil coking" wasn't possible, there wouldnt be a phrase for it.
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Old 02-13-2015, 10:37 AM   #119
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Paragraphs Moxy, paragraphs.

The vast majority of rv owners grew up on cars. Cars that rarely had turbochargers. They grew accustomed to being able to shut them off on a whim and restart them with ease. Repeatedly.

RV's, specifically diesel pushers simply can not be treated like that. You either have to educate yourself on what "oil coking" means, or take the word of those that do understand.

To replace a a car engine might cost $5,000, the diesel in your rv could easily run you into the $20K to $30K range. Remember, if "oil coking" wasn't possible, there wouldnt be a phrase for it.
One more voice of reason!
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Old 02-13-2015, 12:55 PM   #120
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So how many have noticed the absence of the "turn off engine while fueling" stickers on the truck side diesel pumps. I see them all the time on the multi fuel pumps, but I dont recall ever seeing one on the truck side diesel only pumps.
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Originally Posted by palehorse89 View Post
Big truck Islands.......I noticed........posted on all the gas islands
Federal and state "Idle" signs here and there
Not a word about shutting off vehicle or engine on the big boy islands.


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Old 02-13-2015, 04:03 PM   #121
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Not a word about shutting off vehicle or engine on the big boy islands.


So I am not allowed to drink it? oops...how about sniffing, is that ok?
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Old 02-13-2015, 04:05 PM   #122
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Back at post 64, I asked of any reports of turbo failures. Anybody?

Besides the guy whos turbo burst into flames, right after the shop put it on.
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Old 02-13-2015, 05:31 PM   #123
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Back at post 64, I asked of any reports of turbo failures. Anybody?

Besides the guy whos turbo burst into flames, right after the shop put it on.
Your sample set is too small to be a valid indicator.

Cummins puts it this way, obviously their sample set is much higher than ours. ("oil carbonisation" = oil coking)

Quote:
Carbon Build-up Failure from excessive exhaust temperatures or hot shutdown of engine results in carbon build-up. It is recommended that you idle the engine for two to three minutes to cool the bearing system before shutting down. Turbine end heat soak into the bearing housing results in oil carbonisation and corrosion of the bearing system.

The main damage occurs to the shaft seal ring and grooves, turbine end bearing and bearing housing oil drain cavity blockage.
Carbon build-up can be caused by:
  • Hot shutdown of engine
  • Degraded oil quality carbonising in service
  • Infrequent oil change intervals causing oil breakdown in service
  • Air and gas leaks
  • Faulty fuel injector pump/injectors.
Bearing damage due to hot shutdown
Carbon build-up on shaft
http://www.cumminsturbotechnologies....arbon_build_up
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Old 02-13-2015, 05:38 PM   #124
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So I am not allowed to drink it? oops...how about sniffing, is that ok?
Sniffing diesel, especially bio diesel can lead to strange side effects.

Dude...

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Old 02-13-2015, 06:30 PM   #125
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scep,
I worked for a city, for 35 years repairing every kind of diesel powered equipment, they had.
In all that time, I recall 1 turbo failure. It was on a Cat powered truck engine, back in the 70s.

I maintaned many 600+ hp, turbo charged, wood waste grinders that shut down, at full load, due to overheat, all the time. They all lasted well over 10,000 hours.

I idle my turbo charged, boat engine, before shutting down, but do believe turbo chargers are much tougher then some think.

Just my thought
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Old 02-13-2015, 07:09 PM   #126
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twin..

We all come from different experiences in life, and I know we all appreciate yours. I know I have turned a wrench or two...

The trick is to add to our own experiences from those that have relevant but possibly more extensive experiences. That's why I offered Cummins opinion on the subject. Surely you can appreciate that they have torn down far more turbos...

Peace.
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