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Jared D
Jared D, ASE Certified Technician
Category: Classic Car
Satisfied Customers: 1334
Experience:  Shop Supervisor at County Fleet
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I HAVE ATOP OIL FILLER ATTACHED TO A PVC VALVE, BUT A LOT OF

Customer Question

I HAVE ATOP OIL FILLER ATTACHED TO A PVC VALVE, BUT A LOT OF SMOKE VAPOR IS COMING OUT OF THE LOWER CRANKCASE VENT PIPE?
JA: What model and year is your Ford?
Customer: 1956 FAIRLANE TOWN SEDAN
JA: Nice car. The Ford Mechanic can help you with your '56 Sedan. Tell me a bit more about what's going on so he can help you best.
Customer: I HAVE SOLID STATE IGNITION, AC, ALTERNATER.. I HAVE NOTICED AT NIGHT WHEN I SIT AT A STOP LIGHT, SMOKE ABOUT COVERS THE CAR?
JA: Are you hoping to fix this yourself?
Customer: NOT NECESSARILY
JA: Are you ready to speak with the Ford Mechanic now?
Customer: YES
JA: I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Ford Mechanic about your situation and then connect you two.
Submitted: 9 months ago.
Category: Classic Car
Expert:  Jared D replied 9 months ago.

What you are describing sounds like blow-by.

As the engine wears the compression rings loosen and allow combustion gasses to blow-by the compression rings and down into the crankcase. The gases then make their way up to the top of the valve cover through the oil passages and then vent out the PVC or breather system. These gases are hot and will burn some oil on the way up and out, thereby creating the smoke you are seeing.

The only real solution is to rebuild or replace the engine.

You could confirm this with a compression test, but really, the only way to get gasses in the crankcase is from blow-by.

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