Reply
 
Thread Tools Display Modes
Old 04-16-2013, 06:01 PM   #1
Senior Member
 
OL Creeker's Avatar
 
Join Date: Oct 2012
Location: In our CC.
Posts: 646
Exclamation Diesel cool down

I found a forum, <www.diesleplaceforum.com>. It it, the "expert" says idling a Diesel engine for more than just a few minutes can be detrimental. When I have to go to the dealership next week to have the Rhino bed liner sprayed in, I'm gonna talk with the service advisor about this. I'll come back with a full report!
__________________

__________________
Alan, Kathy & Cooper the camping cat
2014 Cedar Creek, 36CKTS
2013 GMC 2500 Denali
Duramax/Allison
Full timers since 5/30/2013
OL Creeker is offline   Reply With Quote
Old 04-16-2013, 06:05 PM   #2
Senior Member
 
lindy's Avatar
 
Join Date: Jun 2011
Location: Jamestown NY
Posts: 588
The practice of letting a diesel idle to cool down before shut down is and "OLD SCHOOL" practice from when the turbos did not have a waste gate system they have today and the exhaust turned the turbo at full speed all the time, thus the need to let the engine idle down for the turbo to slow down before engine shut down and cutting off the oil supply to the turbo.
__________________

__________________

2012 Winnebago "Journey To Insanity" 40U
2008 Dakota Sport 4x4
2004 Subaru Baja - DW's
2006 Honda Shadow Aero - TOAD for now.
F.R.O.G. member
lindy is offline   Reply With Quote
Old 04-16-2013, 06:47 PM   #3
Senior Member
 
OL Creeker's Avatar
 
Join Date: Oct 2012
Location: In our CC.
Posts: 646
I really do feel as though so many of YOU have a lot of knowledge. It's nice that you share it with others! Both DW and I have picked up lots of tid bits.
__________________
Alan, Kathy & Cooper the camping cat
2014 Cedar Creek, 36CKTS
2013 GMC 2500 Denali
Duramax/Allison
Full timers since 5/30/2013
OL Creeker is offline   Reply With Quote
Old 04-16-2013, 06:59 PM   #4
Senior Member
 
Oakman's Avatar
 
Join Date: Jul 2007
Location: Jefferson County, MO
Posts: 5,201
When towing with the 6.4 diesel, Ford recommends allowing the engine to idle 3 to 5 minutes to let the turbos cool down.
__________________


Bob and Joyce
2013 CC Silverback 29RL
2010 Ford F250 XL Crew Cab 6.4 liter diesel
ATU Local 788
Oakman is offline   Reply With Quote
Old 04-16-2013, 07:10 PM   #5
Engineer of Crazy Train
 
ChooChooMan74's Avatar
 
Join Date: Sep 2012
Location: Tiverton, RI
Posts: 1,559
My diesel mechanic strongly recommends to allow the turbo to cool. He advises me 2 minutes for normal driving. I go 2 minutes or 250 on the pyro. This is to prevent the oil from coking in the turbo and having a premature bearing failure. My book even says to allow for cool down.

__________________
TV - 2015 Ram Truck EcoDiesel
TV - 2006 Jeep Liberty Turbo Diesel (Retired to Daily Driver)
TT - 2015 Rockwood Roo 183
Locomotive Engineer
Nights Camping --- 2015 - 19 Camped | Winterized -- 2014 -18
Come read my Camping Blogs
ChooChooMan74 is offline   Reply With Quote
Old 04-16-2013, 07:11 PM   #6
Trailer Trash
 
Join Date: Aug 2012
Location: MN
Posts: 608
It is old school and it can still apply to engines today. But only if you have been hauling a heavy load, working the engine, and the turbo is VERY HOT! Shutting it down right away while turbo is hot tends to cook the oil into goo. I would not let it idle, just drive around soft for a few miles at moderate speeds to keep coolant and oil flowing. Then shut it down as normal after the engine and turbo have had a chance too cool back down to normal operating temps. If that isn't practical for your driving area, then an idle cool down works.
__________________
joelek is offline   Reply With Quote
Old 04-16-2013, 09:42 PM   #7
PPST OGCDG
 
Frank-VA's Avatar
 
Join Date: Sep 2011
Location: Between I-95 & The Great Dismal Swamp
Posts: 2,163
Shutting down hot and the oil flow stops will cause the oil to cook on the turbo shaft. The when over time of starting and shutting down causes the turbo shaft and bushing to wear out. The over time the turbo fins start hitting the turbo housing and then it flies apart and it is sucked it the engine. I have seen this happen on heavy equipment engines. Then to repair the engine the Heads will have to be removed and clean the shredded pieces out of the engine. It this is not done it can cause a busted piston.
__________________
Frank- VA {:-{)
2004 4x4 Ford 6.0 PS, SCC, SB
2005 Wildcat 29 RLBS
Frank-VA is offline   Reply With Quote
Old 04-16-2013, 10:07 PM   #8
Senior Member
 
kz08h5's Avatar
 
Join Date: Apr 2009
Location: Carmel, Indiana
Posts: 308
The main reason for not idling a newer diesel is the DPF, or Diesel Particulate Filter. Under normal circumstances if a regeneration is needed it happens when driving down the highway. To do the regeneration the ECM dumps raw fuel into the cylinders during the exhaust stroke so it can burn the particles in the DPF. This process generates higher exhaust temperatures than normal. I know Duramax engines will throw a code if ECM determines the engine is idling it will halt the process. It will sometimes go into a low (no) power mode until you cycle the ignition, then take it out for a proper drive.

Take a look at the exhaust tip of a newer diesel truck, it is larger than the exhaust pipe and is not sealed to it. That is done so air can be drawn in and mixed with the exhaust to cool the exhaust gas down. The manufacturers don't want people or things getting burned by the exhaust gas when a regeneration is taking place. Inside the DPF the temperature is around 650 C or 1200 F. That will leave a mark.
__________________
kz08h5

2008 Chevy Silverado 2500 Duramax Crewcab
Jeep Commander - sold
Flagstaff V-Lite WRB26
kz08h5 is offline   Reply With Quote
Old 04-16-2013, 10:21 PM   #9
Member
 
Join Date: Feb 2013
Location: Newport, RI
Posts: 54
The DPF can handle a few minutes worth of idling, especially considering the risk of shutting down with a hot turbo.

At work we have two huge Caterpiller engines for propulsion, two medium sized Cats for generators, and a big rig sized Cat for a backup generator. All of them get an idle cool down before shutdown, and EGT must be at 350 or below. Large turbos are very expensive to replace.

Wastegate or not, turbos do need to cool prior to shutdown. I have an EGT guage on my truck, and even unloaded, can take up to a minute to reach 350.
__________________
Wildwood 26TBSS
Dodge Ram 2500 / Cummins Diesel
jrs_diesel is online now   Reply With Quote
Old 04-16-2013, 10:49 PM   #10
Senior Member
 
PapaSmurf's Avatar
 
Join Date: Jan 2012
Location: Mount Juliet, TN
Posts: 242
I do not worry if I am not towing, but if I have been running at 70 MPH for 3 hours towing the camper, when I stop to make the bladder gladder, I leave the engine running and lock the doors. I figure the risk of someone stealing it is less than the risk of ruining the turbo.
__________________

__________________
2011 Ram Truck 2500, Crew Cab, 6.7L CTD, 4X4, 3.73 Rear
PapaSmurf is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 11:46 PM.