Excessive crank case pressure

[Nerfgit]

Hi,

I currently have oil blowing out of my dipstick hole (and I believe some other gaskets have been blown) and am struggling to find where the excessive pressure is coming from, any opinions would be greatly appreciated

[SVOeric]

yeah, that's not great news... blow-by typically comes from air getting past the rings, and pressurizing the crank-case. Not really a lot of other places it can come from.

The short-term fix will be to do some work on the PCV system to handle/dump the extra pressure. There are a few different methods,probably best to search and see which you like most (or hate least). you shouldn't just 'open' the PCV system (well you can, it's just not recommended), as it will create a vacuum leak, and can open a path for debris to enter the oil. That is measured air that's pushing things out. -- so if you DO open the PCV system, you're going to see stalling after throttle, due to the extra fuel you're dumping in. that fuel winds up in the oil, and makes things even worse, as the oil loses it's lubrication properties when it gets diluted with fuel.

[GAboySVO]

Here are a couple of things I would check first before doing major surgery.

- With the engine running, open the oil filler cap and see if there is excessive air flow. You could pull the valve cover breather cap as an alternative, which ever is easier.

- Perform a compression and leak down test to determine if the crankcase pressure is coming from the rings or the valve train.

How is the car running? What boost pressure are you running? Does it only do this after hard driving or will it happen during granny trips to the store?

[scenario]

At the very least I would immediately do a compression test. Leakdown test as well but like I said start with the basics.

[svono50]

As noted above, basics first before diving off the deep end. Check the PVC valve if it can hold back pressure from the intake (i.e.- boost pressure). Even new EV-127's are known for not properly sealing out of the box. That is typically your #1 source for excessive crankcase pressure.

[BillS]

Hi. I am new to this, so bear with me. I am the orginal owner of a 1986 SVO with the same problem. I bought the car brand new and this problem started right away. I brought it back to the dealer several times with no luck. I finally filed Lemon Law paperwork and that’s when the dealer contacted me. Ford flew an engineer in from Detroit to look at the car. After a couple weeks they told me to drop the car off, and after 2 days the problem was fixed. There was a clogged vacuum line (don’t know which) that was causing the back pressure. Ford fixed it and it hasn’t been a problem since.
PS. Before it was fixed, the first time after the car would sit when I would get on it and let off the gas I would get a huge plume of smoke out of the back of the car.

[SVOeric]

would have to be one of a couple lines --
one -- the 'big' one that runs between crank breather (under the intake) and into the PCV
or
the line that runs OUT of the PCV and into the intake.
the other thing it could possible be, is the crankcase breather itself.

[gbeaird]

Hi. I am new to this, so bear with me. I am the orginal owner of a 1986 SVO with the same problem. I bought the car brand new and this problem started right away. I brought it back to the dealer several times with no luck. I finally filed Lemon Law paperwork and that’s when the dealer contacted me. Ford flew an engineer in from Detroit to look at the car. After a couple weeks they told me to drop the car off, and after 2 days the problem was fixed. There was a clogged vacuum line (don’t know which) that was causing the back pressure. Ford fixed it and it hasn’t been a problem since.
PS. Before it was fixed, the first time after the car would sit when I would get on it and let off the gas I would get a huge plume of smoke out of the back of the car.

And welcome, BTW! Cool way to introduce yourself. :-)

[scenario]

Hi. I am new to this, so bear with me. I am the orginal owner of a 1986 SVO with the same problem. I bought the car brand new and this problem started right away. I brought it back to the dealer several times with no luck. I finally filed Lemon Law paperwork and that’s when the dealer contacted me. Ford flew an engineer in from Detroit to look at the car. After a couple weeks they told me to drop the car off, and after 2 days the problem was fixed. There was a clogged vacuum line (don’t know which) that was causing the back pressure. Ford fixed it and it hasn’t been a problem since.
PS. Before it was fixed, the first time after the car would sit when I would get on it and let off the gas I would get a huge plume of smoke out of the back of the car.

Hi Bill,

welcome...we like pics. Plz show us your SVO