70 390 PCV issues
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4wd Low
Joined: Jun 2010
Posts: 12
Likes: 0
From: Virginia
70 390 PCV issues
Hey all, I have a strange issue with my 1970 390. I have an oil smoke/mist blowing out of both breathers. I have installed two new PCV's. I have removed the PCV and stuck the hose directly in to the valve cover and it does not blow mist/smoke out of the breathers. Does anyone have any thoughts on why the engine blowing smoke out of the valve cover breathers. This engine is a fresh build to stock specs and is bored .010 over. Vacuum is set at 21-inches. Distributor is set to the manual, rpm is at 750 (Manual trans).
Stumped.
Stumped.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Crowbar, Don't know your configuration, but it should go like this.
One (EDIT that should be Valve cover) *breather* has a vented filler cap, the other (usually the passenger side) gets the pcv with a hose connected to the base of the carb to suck by vacuum & burn the gases and smoke if there is any.
It appeared when I read your post that your's may not be like that.
The vac. sweeps the engine and gets rid of the undesirable.
John
One (EDIT that should be Valve cover) *breather* has a vented filler cap, the other (usually the passenger side) gets the pcv with a hose connected to the base of the carb to suck by vacuum & burn the gases and smoke if there is any.
It appeared when I read your post that your's may not be like that.
The vac. sweeps the engine and gets rid of the undesirable.
John
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4wd Low
Joined: Jun 2010
Posts: 12
Likes: 0
From: Virginia
I will check that out this weekend. It is just to darn hot out today and it is supposed to be 99 tomorrow. I hope my findings come out with no oil in any of the cylinders. If it does I will be shocked, but hey stuff happens. Thanks.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
"As original" FE engines as installed in 1968/72 F100/350's and 1968/71 Passenger Cars:
The left (drivers) side valve cover has an oil cap with a hole in its center. A rubber grommet fits into the hole. A 90 degree plastic elbow fits into the grommet.
A piece of neoprene smog hose routes from the elbow on the oil cap to a nipple on the air cleaner.
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The right (passenger) side valve cover has a hole in it for the rubber grommet the smog valve fits into. A piece of neoprene smog hose routes from the valve to a nipple that is part of the carburetor spacer plate.
The left (drivers) side valve cover has an oil cap with a hole in its center. A rubber grommet fits into the hole. A 90 degree plastic elbow fits into the grommet.
A piece of neoprene smog hose routes from the elbow on the oil cap to a nipple on the air cleaner.
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The right (passenger) side valve cover has a hole in it for the rubber grommet the smog valve fits into. A piece of neoprene smog hose routes from the valve to a nipple that is part of the carburetor spacer plate.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
It's just as hot in the Tarheel. 
Make sure the vac. is sucking at the pcv, when the grommets are tight, & it is sucking you should not see anything at all. The system will be sweeping the vapors from the engine.
John
Make sure the vac. is sucking at the pcv, when the grommets are tight, & it is sucking you should not see anything at all. The system will be sweeping the vapors from the engine.
John
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