wet sacking or wet stackin
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From: Colorado
wet sacking or wet stackin
I've seen the term wetsacking (or wetstacking) used in context with diesel engine's. Can anyone tell me what this means - why and how it happens, or how to prevent it? My guru at FMC isn't familliar with the term.
J
J
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From: Lyndonville, Vermont
As far as I know its wet stacking it happens with excessive idling and fuel builds up as engine temps go down....oil and soot create a problem that can actually get pretty bad a gooy mess used to happen to trains alot.
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From: Colorado
I think we are on the right track - as I recall the term is used in context with idling in osme way. Seems I recall something about mining operations or agricultural use whre the truck had to idle all day in very brutal weather???
Posting Guru
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From: Roseburg OR.
I've read that the powerstroke has this problem with excessive idling. It is unburnt and partially burnt diesel being pumped out the exhaust and collecting on the exhaust valve where it hardens and builds up over time on the valve stem causing the exhaust valve to not close properly.
This was the basic defenition given to me in the 7.3 forum. Hope it helps.
Oh yeah and it was wetstacking when it was explained to me. If you want to double check you should post in the 7.3 or 6.0 forum (whichever you have). Motor specific questions (especially the diesels) are best answered in the forums specifically dedicated to them. You will get more responses.
This was the basic defenition given to me in the 7.3 forum. Hope it helps.
Oh yeah and it was wetstacking when it was explained to me. If you want to double check you should post in the 7.3 or 6.0 forum (whichever you have). Motor specific questions (especially the diesels) are best answered in the forums specifically dedicated to them. You will get more responses.
Last edited by RRMike; Jan 8, 2004 at 10:46 AM.
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From: Calgary Canada
WET STACKING
Wet stacking is when the combustion temps aren't high enough to burn all the fuel completely. When this happens the fuel gets by the piston rings and into the oil. The fuel also "resinates" and hardens on the exhaust valves causing valve, rocker arm and/or piston damage due to the valve not being able to close anymore. Keeping EGT above 275*F pre turbo no matter how much rpm it takes, is the only solution.
No diesel engine is exempt from wet stacking. The best cure is to install an aftermarket auxillary idle controller that will allow you increase and maintain idle rpm. I believe some of the high end units these days are even automatic - ie they control idle rpm based on engine temperature sensors.
Idling to warm up (and cool down) is a must, excessive idling is very harmful though.
Waxy
Wet stacking is when the combustion temps aren't high enough to burn all the fuel completely. When this happens the fuel gets by the piston rings and into the oil. The fuel also "resinates" and hardens on the exhaust valves causing valve, rocker arm and/or piston damage due to the valve not being able to close anymore. Keeping EGT above 275*F pre turbo no matter how much rpm it takes, is the only solution.
No diesel engine is exempt from wet stacking. The best cure is to install an aftermarket auxillary idle controller that will allow you increase and maintain idle rpm. I believe some of the high end units these days are even automatic - ie they control idle rpm based on engine temperature sensors.
Idling to warm up (and cool down) is a must, excessive idling is very harmful though.
Waxy
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From: Lyndonville, Vermont
I copied this off the web.... Do they all have it?
Ford Only
1999 F350 4X4, Crw Cab, Pickup, Engine: 7.3L Diesel, 8 Cyls, Calib: Trans: ZF M6HD-6, Axle: 6830F3.73C, Symp: 6 19 4 91 Drvabl fast idle, Temp: Cold Engine
Idle Kicker active after 130 seconds
The 1999 Super Duty F-Series Trucks equipped with the 7.3L DIT have a strategy that includes a cold weather idle kicker feature which, under certain conditions will automatically elevate the idle speed after 130 seconds of idling at cold temperatures. This feature raises the idle speed up to a maximum of 1200 RPM, Based on air cleaner inlet temperature and the engine oil temperature. For this feature to be activated, the truck must be in park, (for the 4R100 Auto Trans), or in neutral with parking brake applied (for M6OD Manual Trans) and engine oil temp below 70 degrees Celsius. If any pedal or control is moved, the engine returns to base idle speed and the timer starts over.
This strategy raises the RPM level to the point where the EBP (exhaust back pressure) works and warms up the engine. The intent is to alleviate the tendency (common to all diesels) to produce "Coking or Wet Stacking" when idled for prolonged periods at cold temperatures. Note: These higher idle speeds will have a direct impact on fuel mileage.
Ford Only
1999 F350 4X4, Crw Cab, Pickup, Engine: 7.3L Diesel, 8 Cyls, Calib: Trans: ZF M6HD-6, Axle: 6830F3.73C, Symp: 6 19 4 91 Drvabl fast idle, Temp: Cold Engine
Idle Kicker active after 130 seconds
The 1999 Super Duty F-Series Trucks equipped with the 7.3L DIT have a strategy that includes a cold weather idle kicker feature which, under certain conditions will automatically elevate the idle speed after 130 seconds of idling at cold temperatures. This feature raises the idle speed up to a maximum of 1200 RPM, Based on air cleaner inlet temperature and the engine oil temperature. For this feature to be activated, the truck must be in park, (for the 4R100 Auto Trans), or in neutral with parking brake applied (for M6OD Manual Trans) and engine oil temp below 70 degrees Celsius. If any pedal or control is moved, the engine returns to base idle speed and the timer starts over.
This strategy raises the RPM level to the point where the EBP (exhaust back pressure) works and warms up the engine. The intent is to alleviate the tendency (common to all diesels) to produce "Coking or Wet Stacking" when idled for prolonged periods at cold temperatures. Note: These higher idle speeds will have a direct impact on fuel mileage.
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Posting Guru
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From: Roseburg OR.
My 99 does that. It freaked me out the first time I was outside of it talking and it revved up! As soon as I touched the brake it returned to normal idle.
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From: Here in No. Calif
mine also revs to about 1200 rpm, however if I`m not mistaken I use powerkleen for my rig and thats supposed to alleviate wet stacking, to some degree. I wouldn`t idle for more than 15-20mins,,my .02
Hanklin
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