White smoke coming from engine oil cap and the dipstick?
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Senior User
Joined: Feb 2016
Posts: 493
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From: Royersford Pennsylvania
White smoke coming from engine oil cap and the dipstick?
Hey yall, white smoke is coming from my engine oil cap or my engine dipstick. If the cap is off it comes from the engine fill spot, but if its on smoke comes from the engine oil dipstick. Is this normal for driving for a bit over an hour? Are my piston rings wornout?
Post Fiend
Joined: Dec 2009
Posts: 15,505
Likes: 18
From: Livoina,La
It's called blow by and is normal. If it's not pushing the dipstick up or blows the oil fill cap off when turned upside down over the hole then it's fine. Every seen that little stream off smoke blowing out under the engine of a big rig ? Same thing
Lead Driver
Joined: Apr 2016
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From: Bahstun
Should the oil fill cap test be done with vent port to turbo blocked?
Lead Driver
Joined: Apr 2016
Posts: 7,202
Likes: 1,340
From: Bahstun
Oh thanks, sorry to hijack the thread a lil. I checked mine the other night and no blow by when cold or warm. Wisps of vapor was coming out I knew was normal, since my Yanmar diesel does it too on the vent hose
Hotshot
Joined: Dec 2005
Posts: 14,376
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From: evansville in
A very smart psd tech I respect once advised.
Engine warm
Engine revs at 2000
If the blow by wafts out it's ok,if it's a straight cylinder shooting up toward the hood then it's done.
That method has never failed me so far.
Engine warm
Engine revs at 2000
If the blow by wafts out it's ok,if it's a straight cylinder shooting up toward the hood then it's done.
That method has never failed me so far.
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