engine cool down vs. wet stacking?
Thread Starter
|
Senior User
Joined: Nov 2003
Posts: 331
Likes: 0
From: Abilene TX
engine cool down vs. wet stacking?
I'm a bit confused, I've been told that it is bad to let my truck idle for more than 5-10 minutes due to running the risk of wet stacking and the introduction of fuel into the crank case.....
Now having said that i've been told its equally important to idle my engine down after running her hard or after a prolonged drive, and i've seen idle down timers talking about 20 minute idle down. Whats the correct answer???
Now having said that i've been told its equally important to idle my engine down after running her hard or after a prolonged drive, and i've seen idle down timers talking about 20 minute idle down. Whats the correct answer???
Senior User
Joined: Sep 2000
Posts: 194
Likes: 0
From: Needham US of A
Going to pick my 02 psd (first diesel I've owned) up this afternoon....I'm bad about going into a parts house or other places and doing some bench racing and forgetting the truck's running....is wet-stacking a viable issue?
Later Whit
Later Whit
Senior User
Joined: Apr 2003
Posts: 199
Likes: 0
Trending Topics
Senior User
Joined: Jan 2003
Posts: 359
Likes: 0
From: Maryland
WEWELD,
Do you have the turbo monitor wired to your pyro or some other way? If hooked to your pyro, how did you do it? Thinking of getting on of those myself.
Do you have the turbo monitor wired to your pyro or some other way? If hooked to your pyro, how did you do it? Thinking of getting on of those myself.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Senior User
Joined: Nov 2003
Posts: 435
Likes: 0
From: NW
I guess that all depends on your driving immediately prior to wanting to shut it dow. If you have been driving a long distance, such as on an interstate, and pull right off to a service station, or restuarant, you might benefit from a one or 2 minute "idle down" before shutting down, but if you are like me, either stopping when I get to work, or home, I have already been driving in a very reduced throttle condition because of the neighborhood, and traffic conditions, so the EGT's are already down. Still, when I get to work, or home, I generally let it idle another 15 to 30 seconds to be safe before shutting down.
Cargo Master
Joined: Oct 2003
Posts: 2,833
Likes: 4
From: Jefferson, Iowa
wetsacking is when the engine cools down, due to a diesel not making enough heat when idling, and then garbage builds up on the exhaust valve, and then does not seat as quickly, and then the piston will hit the valve, and the pushes the pushrod, then the lifters expand to compensate, and then the piston hits it again, and the pushrods do not bund anymore and something major goes kaboom. Usually if you use powerservice or something simular greatly reduces the risk, because it keeps everything clean on the inside. Also that is why on newer diesels the pcm will raise the idle to about 1000 rpm to either warm the motor up or the keep it warm. I usually let my truck sit for about a minute idling after a long trip.
Junior User
Joined: Feb 2004
Posts: 64
Likes: 0
You don't have to worry about wetstacking......idle your truck for hours and you won't have any real problems....I work in the arctic circle on large mining equipment and have only seen wetstacking once.... on a cat 3516.....fast idle program malfunctioned...truck idled at 700rpm for approx 40 hours straight at -50 degrees before there was enough build up on a valve stem to cause it to stick and smack the piston... people that worry about this in their pickup have way too much time on there hands...better to idle too long than not enough
Laughing Gas
Joined: May 2003
Posts: 1,148
Likes: 1
From: Richmond, VA
The main culprit in wet stacking is not getting the engine hot enough to burn efficiently enough to remove the valve (stem) deposits.
When (idling) cold the fuel does not burn completely. The unburned products deposit on the engine components - mainly the exhaust valves. If these deposits are not removed the result can be a sticking or stuck valve. Because of the tight clearances between the piston and valve due to the high compression ratio of a diesel engine a stuck or sluggish valve can make contact with the piston. The results? A weekend doing a rebuild or $$$$ to your favorite mechanic.
The cure? Drive the truck before shutting down the engine. This will get the internals hot enough to burn the deposits off the valves.
Newer engines designs try to help out by boosting the idle to warm the engine faster.
No engine should or needs to idle excessively. Driving will always warm the engine faster and is the desired method.
Also, never race the engine prior to shutdown. You will spin up the turbine and then starve it of oil when the engine stops.
Reg
When (idling) cold the fuel does not burn completely. The unburned products deposit on the engine components - mainly the exhaust valves. If these deposits are not removed the result can be a sticking or stuck valve. Because of the tight clearances between the piston and valve due to the high compression ratio of a diesel engine a stuck or sluggish valve can make contact with the piston. The results? A weekend doing a rebuild or $$$$ to your favorite mechanic.
The cure? Drive the truck before shutting down the engine. This will get the internals hot enough to burn the deposits off the valves.
Newer engines designs try to help out by boosting the idle to warm the engine faster.
No engine should or needs to idle excessively. Driving will always warm the engine faster and is the desired method.
Also, never race the engine prior to shutdown. You will spin up the turbine and then starve it of oil when the engine stops.
Reg
Posting Guru
Joined: May 2001
Posts: 1,702
Likes: 0
Junior User
Joined: Jun 2002
Posts: 54
Likes: 0
From: Covington,TN
If I remember correctly, in 2000-2001 ford incorporated an extended idle program that if the oil temps fall below a certain point and/or ambiant temp is low it raises the idle and turns on an intake heater located after the intercooler and before the heads. It goes back to base idle when the brake or clutch is depressed. My 2001 work truck did that.