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2012 MKZ 2.5 hybrid. Engine has excessive blow by. When the…

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2012 MKZ 2.5 hybrid. Engine...
2012 MKZ 2.5 hybrid. Engine has excessive blow by. When the engine is running and the oil cap is removed it has an extreme amount of pressure coming out.
Submitted: 2 years ago.Category: Lincoln
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Answered in 5 minutes by:
1/20/2016
Lincoln Mechanic: EricFromCT, Technician replied 2 years ago
EricFromCT
EricFromCT, Technician
Category: Lincoln
Satisfied Customers: 4,783
Experience: ASE, Ford Lincoln Mercury Senior Master, Diesel, Kia Professional Elite
Verified

Hi. Does the vehicle have any other concerns like excessive oil consumption or blue smoke out the exhaust?

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Customer reply replied 2 years ago
No oil consumption and no smoke. It does however push oil through the sensor in the valve cover. By the way it only has 38,000 miles on it
Lincoln Mechanic: EricFromCT, Technician replied 2 years ago

It is more common to have the valve cover leak and cause oil to be where the sensor is.

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Customer reply replied 2 years ago
The valve cover gasket is not leaking. The pressure is forcing it out at the sensor at the top of the cover and it sprays all over the engine.
Lincoln Mechanic: EricFromCT, Technician replied 2 years ago

Have you checked the oil level?

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Customer reply replied 2 years ago
initially it was about a quart and a half over full. I then changed the oil and filter. I also removed the intake manifold and there was oil standing in it and the throttle body was saturated also. Cleaned them both and restarted and got the same results. When the intake was off I also removed, inspected, and cleaned the crankcase vent assembly.
Lincoln Mechanic: EricFromCT, Technician replied 2 years ago

How did it get overfilled? Perhaps the piston rings became saturated with oil and now the compression ring(s) are stuck getting you a lot of pressure in crankcase. Dont see how else pressure would be there. Sounds like you have excessive blow by.

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Customer reply replied 2 years ago
I think the cars owner may have overfilled it. I did a compression check and all the cylinders are approximately 100 psi. I looked in Alldata and Mitchell but couldn't find specs for compression. If the compression rings are stuck, what could have caused it, and how do I unstick them?
Customer reply replied 2 years ago
Are you still helping me?
Lincoln Mechanic: EricFromCT, Technician replied 2 years ago

Yes I am. I have checked the shop manual and they do not say that you can do a compression check on the 2.5L hybrid because it has a different cycle called atkinson cycle engine which allows for low compression so the engine can start easier when switching to hybrid and gas.

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Lincoln Mechanic: EricFromCT, Technician replied 2 years ago

So I doubt the rings are stuck. I wonder if taking the plugs out and pulling the injector connectors and cranking it for a while may dry out the cylinders. Perhaps the walls are just really washed with oil.

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Lincoln Mechanic: EricFromCT, Technician replied 2 years ago

I am just checking in and will be back online after 8pm.

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Customer reply replied 2 years ago
I'll try pulling the plugs and disconnecting the injectors and cranking it over as you suggested today and get back to you.
Lincoln Mechanic: EricFromCT, Technician replied 2 years ago

Ok.

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