Air pushback - Team Camaro Tech
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post #1 of 10 (permalink) Old Apr 25th, 15, 02:22 PM Thread Starter
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jerry
 
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Air pushback

Pcv valve has 1/8" hole thru it,so PVC tube from v. Cover to carb is clear.
Problem is, when I blow thru pass side v cover tube, which should go thru
To crankcase, then to pcv valve, and I quit blowing , it pushes air back into my face. Is there a blockage somewhere?
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post #2 of 10 (permalink) Old Apr 25th, 15, 05:45 PM
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Re: Air pushback

The PCV valve is essentially a checkvalve so air only goes through one way. Could it be you are blowing from the wrong direction of air flow?

This diagram shows air flow direction.

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post #3 of 10 (permalink) Old Apr 25th, 15, 06:31 PM Thread Starter
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Re: Air pushback

I mentioned the PVC had no valve, only a 1/8" hole. This PVC is hollow,
That's why I could blow thru it. Seems like somewhere, something is
Plugged. I'm getting oil blow- by, it looks like, from the rear main seal.
The engine only has about 4 k miles. Appreciate all thoughts.
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post #4 of 10 (permalink) Old Apr 25th, 15, 07:59 PM
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Re: Air pushback

Quote:
Originally Posted by JERRYS 69 Z View Post
I mentioned the PVC had no valve, only a 1/8" hole. This PVC is hollow,
That's why I could blow thru it. Seems like somewhere, something is
Plugged. I'm getting oil blow- by, it looks like, from the rear main seal.
The engine only has about 4 k miles. Appreciate all thoughts.
If you remove the PCV valve from the opposite side valve cover, then blow air into the vent tube, does the air pressure continue to back flow? If it does, you've got a problem. The oil drain holes in the one head/valve cover should create the air passage thru the crankcase and back to the opposite head/valve cover.

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post #5 of 10 (permalink) Old Apr 25th, 15, 08:30 PM
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Re: Air pushback

Quote:
Originally Posted by JERRYS 69 Z View Post
I mentioned the PVC had no valve, only a 1/8" hole. This PVC is hollow,
That's why I could blow thru it. Seems like somewhere, something is
Plugged. I'm getting oil blow- by, it looks like, from the rear main seal.
The engine only has about 4 k miles. Appreciate all thoughts.
You said when you blow thru the passenger side vent tube it blows back ?

That should be an open hole allowing air to enter the engine. There should be no obstructions on the passenger side. That's where you probably have a problem if I understand what you are saying.

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post #6 of 10 (permalink) Old Apr 26th, 15, 07:08 AM Thread Starter
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Re: Air pushback

I think you folks have hit the nail on the head. There has to be an
Obstruction under the valve covers. I agree, the air should pass thru
The crankcase to the opposite valve cover. First, I will try blowing
Thru with the pcv removed. If this don't work, I will pull both valve
Covers to determine problem. I will get back when I find answer.
First, car goes in tomorrow for a little paint work. Should have it
Back in a few weeks. Thanks for info.
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post #7 of 10 (permalink) Old Apr 26th, 15, 07:49 AM Thread Starter
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Re: Air pushback

It's been awhile since I put an engine together, but question is:
Does oil go directly to pan from return holes in heads? Need to know
If I have to drill thru head gasket for drainage, where pieces would
Go? Or is there a better way without pulling heads?
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post #8 of 10 (permalink) Old Apr 26th, 15, 08:50 PM
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Anne
 
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Re: Air pushback

Quote:
Originally Posted by JERRYS 69 Z View Post
It's been awhile since I put an engine together, but question is:
Does oil go directly to pan from return holes in heads? Need to know
If I have to drill thru head gasket for drainage, where pieces would
Go? Or is there a better way without pulling heads?
Oil drainage isn't your problem. I suspect there is something blocking your passenger-side elbow that goes into your valve cover and connects to your air filter.

Government's first duty is to protect the people, not run their lives.
Ronald Reagan

Last edited by Lawrence454; Apr 26th, 15 at 09:56 PM.
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post #9 of 10 (permalink) Old Apr 27th, 15, 10:49 AM Thread Starter
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Re: Air pushback

Thanks Anne,
I will ck. that out when I get car back from paint shop. That has
To be answer as I can blow air to crankcase from drivers valve cover.
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post #10 of 10 (permalink) Old Apr 27th, 15, 07:07 PM Thread Starter
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Re: Air pushback

Anne,
I will look into your sugg. As soon as the car comes back from paint jail.
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