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What Does Wet Stacking (Diesel Engine)Mean.

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Howard Yoshida

04-29-2003 18:43:06




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Aloha, I have heard the term wet stacking (diesel engine)and was wondering what it meant. TIA

Mahalo,
Howard




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OC Joe

05-01-2003 10:52:38




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 Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Howard Yoshida, 04-29-2003 18:43:06  
Wet stacking has a lot to do with new diesel
engine break in also,a new engine should be warmed
up and then put under load a least one hour to seat the rings and prevent WET STACKING.Low rpm
light loads is the worst thing you can do to a new
diesel engine.

Joe



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Jim N

04-30-2003 19:55:01




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 Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Howard Yoshida, 04-29-2003 18:43:06  
I read somewhere once that slobber is just water and soot. I don't know if what I read was true or not. I've never tasted the stuff to find out nor do I ever want to.



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thurlow

04-30-2003 08:29:09




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 Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Howard Yoshida, 04-29-2003 18:43:06  
Have always had a problem with our loader tractors; extended hours at low RPM and light load. Would often "slobber" at exhaust manifold gaskets, 'though there was not a problem at other times; maybe the high temperature expansion when under load led to better seal at other times. Always tried to 'vary' which tractor we pulled feed grinder with; high RPM at full load for a couple of hours; get the operating temperature up..... .

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G Taylor

04-30-2003 05:21:41




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 Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Howard Yoshida, 04-29-2003 18:43:06  
Raw fuel or condensation from combustion mixing with soot. This mess then accumualates and runs back down the stack. Or begins to blow out the stack getting black stains over everything. Caused by over fueling, too low operating temp, worn injectors/pump, worn rings/bores and light loading. So replace the injectors,test the pump, get the coolant up to 195F and run the engine at full rated rpm and 85% of max rated HP. End of problem 99% of the time.

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Joe (Wa)

04-29-2003 22:21:19




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 Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Howard Yoshida, 04-29-2003 18:43:06  
Hi Howard, wet stacking is the result of running a high compression engine with a low load. The marine term is "slobbering". The problem is insufficient firing pressure to seat the rings and pumping oil up into the exhaust manifold and stack. Talk about the temptation to commit murder on the high sea. Been there, retired chief engineer, Joe



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Chip

04-30-2003 16:28:06




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 Re: Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Joe (Wa), 04-29-2003 22:21:19  
Especially with a Fairbanks. Soon to be retired SCPO.



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Howard

04-29-2003 22:27:55




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 Re: Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Joe (Wa), 04-29-2003 22:21:19  
Aloha Joe, thanks for the reply. Ok, now I get it.
Not enough load so oil bypasses the rings and shoots out of the exhaust. Yes, it could get very messy and I wouldn't want to clean up all that mess. Thanks.

Mahalo,
Howard



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Howard Yoshida

04-30-2003 11:15:23




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 Re: Re: Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Howard, 04-29-2003 22:27:55  
Aloha, after reading all the postings about what wet stacking does, now I know what to look out for when I run my small diesel 43hp generator engine. Right now it doesn't have a generator head so I will get something in the 25kw range and make sure it has a full load.

Mahalo,
Howard



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Howard Yoshida

04-30-2003 02:49:02




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 Re: Re: Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Howard, 04-29-2003 22:27:55  
Aloha Joe, I know what you mean, I wouldn't want to be on a burning ship. TIA

Mahalo,
Howard



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Joe (Wa)

04-29-2003 23:10:43




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 Re: Re: Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Howard, 04-29-2003 22:27:55  
Howard, the mess that is not a problem. Stack fires sink many ships. Joe



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SHeiserman

04-29-2003 19:47:16




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 Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Howard Yoshida, 04-29-2003 18:43:06  
Howard, I don't remember the particulars, but I believe it has to do with running a diesel too long without putting a good load on it. We used to have to run diesel generators for a certain length of time. After a while you would get a build up of oil around the exhaust manifold gaskets. It could make quite a mess. Hooking it up to a load bank and letting it work would take care of it for awhile. That's how I remember it.

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Howard

04-29-2003 22:21:21




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 Re: Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to SHeiserman, 04-29-2003 19:47:16  
Aloha SHeiserman,and thanks for the reply. Where does the oil come from? Is it leaking from the gasket? TIA

Mahalo,
Howard



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Bob M

04-30-2003 06:50:52




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 Re: Re: Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Howard, 04-29-2003 22:21:21  
Howard - G Taylor's post above summarizes the sources wet stacking very well. I see it along a nearby railyard in cold weather. Locomotives are left idling in cold weather to prevent freezing - often for a day or longer. When the locomotives are subsequently loaded up they'll spew this sticky black "stuff" that then rains down on everything nearby. It's especially noticable with snow on the ground. It's accompanied by large volumes of smoke and (occasionally) by exhaust stack flames as the accumulated fuel/oil/soot burns off. Quite impressive after dark!

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Hal/WA

04-30-2003 12:11:04




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 Re: Re: Re: Re: What Does Wet Stacking (Diesel Engine)Mean. in reply to Bob M, 04-30-2003 06:50:52  
I used to be a fireman. We had trouble with the railroad that runs through the fire district idling engines for long periods in the switchyards and then pulling a train up the long grade through a forested area. I have seen series of fires 5 miles long following those tracks, with 25 or more separate places where fire started from red hot coke being shot from the diesel engine's exhaust. The railroad was supposed to clean some screens that are there to catch the coke, but sometimes they did not. It really cost the railroad lots of money a few times, since the fire district charged them for the costs of fighting the fires. Luckily, we never lost a house or very much acreage, but it was very scary for residents that lived close to those tracks.

Farm tractors also can spit out chunks of red hot coke or other materials from exhaust pipes. My Dad had it happen once when he started plowing after not using the tractor very hard for some time. He did not notice it right away and it got going real good and burned about 10 acres of somewhat dry grass before the fire department controlled it. I was aware of this possible problem and have had several small fires start over the years, but have never had to get help to put them out. I do not run my diesel tractor much when it is extremely dry.

I still think diesel tractors are safer, fire-wise than gas tractors. Gas tractors can and will burn down if gas leaks occur and the spilled gas ignites. Diesel will just about not ignite at all unless it is very hot.

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