Cylinder Washing?
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Freshman User
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From: Coeur d' Alene, ID
Cylinder Washing?
I just bought a 2001 F-250 PS 6 spd, and I have been told that you should not downshift to slow down because it can cause a cylinder to wash? Is this correct, or is it okay to downshift and use the engine to brake. I don't see that this could happen as if that was the case, you would have to either put it in nuetral or push in the clutchto go down a hill. Please give me more info. Thanks!
Hotshot
Joined: Dec 2003
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From: iowa
Well, let me put this in, I drive Semi tractor trailer and you downshift to slow down in them all the time, infact it's almost required expecially when loaded heavy or you will over heat brakes in a hurry. Now with all that downshifting, if cylinder washing due to down shifting was a problem then it would show up in these trucks but the engines in a semi regularly make it a million miles or more (not always of coarse but there is more to an engine than cylinders and pistons) so I don't see it hurting a thing. Granted a semi is not a PSD but I believe the principles of operation are the same.
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Post Fiend
Joined: Jul 2005
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From: 21791
i think i will have to raise the 
on that. monsterbaby is right, downshifting will only save your brakes maybe at the expense of a clutch or two for the life of the truck if you do not rev the engine perfectly to the speed of the transmission after you downshift (you shift and the transmission brings the engine speed up to match clutch speed if you dont rev it perfectly.
a chipped powerstroke will wash out the rings before downshifting one will wash out the rings.
on that. monsterbaby is right, downshifting will only save your brakes maybe at the expense of a clutch or two for the life of the truck if you do not rev the engine perfectly to the speed of the transmission after you downshift (you shift and the transmission brings the engine speed up to match clutch speed if you dont rev it perfectly. a chipped powerstroke will wash out the rings before downshifting one will wash out the rings.
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Originally Posted by 01PowerStrokeF250
I just bought a 2001 F-250 PS 6 spd, and I have been told that you should not downshift to slow down because it can cause a cylinder to wash? Is this correct, or is it okay to downshift and use the engine to brake. I don't see that this could happen as if that was the case, you would have to either put it in nuetral or push in the clutchto go down a hill. Please give me more info. Thanks!
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Freshman User
Joined: Jul 2006
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From: Coeur d' Alene, ID
Thanks for the help. That is what I thought, and I have always downshifted to slow down, without any problems. However, when my brother-in-law bought his PowerStroke, the mechanic at Ford that he knows told him about the cylinder washing. As I had not heard of this before, I figured that I would ask you all as if it was true, someone here would have hear of it. Thanks again!
Lead Driver
Joined: Jul 2005
Posts: 5,967
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From: Eccles, WV
I think that the mechanic that said that needs to go back to diesel school or put up his wrenches. The only time I know that a cylinder wash will occur is when it is sitting at idle for a long time. That is why all the chip makers have a setting for high idle (1,200 rpm). There is also a mod list here on the site if you don't have a chip that just uses a switch and a few small radio shack parts. Either one prevents the cylinders from washing down.
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