engine blowby
Postmaster
Joined: Mar 2013
Posts: 3,066
Likes: 7
From: Over There
How many times can I tell you, its just a PCV issue.
Think about it, what's at the bottom of the dipstick tube? The crankcase, so why would oil blow out the dipstick tube? Cause pressure in the crankcase is higher then outside, so why would the pressure in the crankcase be too high? Cause the PCV system, (C=crankcase V=ventilation or vacuum) isn't working well enough.
Think about it, what's at the bottom of the dipstick tube? The crankcase, so why would oil blow out the dipstick tube? Cause pressure in the crankcase is higher then outside, so why would the pressure in the crankcase be too high? Cause the PCV system, (C=crankcase V=ventilation or vacuum) isn't working well enough.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,652
Likes: 79
From: Mooresville, NC
I have a 1987 f250 with a 351w motor, I am getting oil blowing out the dipstick tube. there is no smoke coming out the exhaust and the engine runs smooth. The pvc is new and the lines are not kinked or restricted. Does anyone have any idea what might be causing this besides the rings.
Postmaster
Joined: Mar 2013
Posts: 3,066
Likes: 7
From: Over There
Good discussion here about pressure build up (restricted PCV) and rings -- both are definitely players...........however, until you do a leak down test and inspect your plugs it's indeterminate ................my suspicion is both are contributing factors given the trucks age.............
Posting Guru
Joined: Sep 2013
Posts: 1,033
Likes: 0
Really its that guys call on that one, if he feels he should pull it and freshen it up some so the blow-by goes down a fair bit that's his call. But if he just wants to add a higher amount of flow to yee old pcv valve then that's his call to. Franky me being the cheapo I am I would just gut the valve and call it a job well done given I still had good power if it was blowing the dipstick out over and over again or I had oil coming out my breather cap.
Postmaster
Joined: Mar 2013
Posts: 3,066
Likes: 7
From: Over There
Really its that guys call on that one, if he feels he should pull it and freshen it up some so the blow-by goes down a fair bit that's his call. But if he just wants to add a higher amount of flow to yee old pcv valve then that's his call to. Franky me being the cheapo I am I would just gut the valve and call it a job well done given I still had good power if it was blowing the dipstick out over and over again or I had oil coming out my breather cap.
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