PCV on both sides?
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PCV on both sides?
On my '73 F100 302, there is a PCV in the oil filler cap that may or may not be factory, but it is an old Motorcraft part. I have a brand new PCV in the passenger side, which didn't have anything in it when I got the truck. My plan is to do as factory as I can and run the passenger side to the filtered connection on the air cleaner and then figure out a place for the oil filler. Should I just run one side as a breather and forget factory? Run two PCV's?
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Blackjack33, that bottom diagram is exactly what I've been looking for, thanks! Looks like the PCV is in the oil filler as I saw and it's just an elbow out of the passenger side that goes to the filtered part of the air cleaner. Also, now I know that that metal line that was connected to the oil filler line actually goes into the port in the carb in the front that the PO had plugged. I think that port only draws vacuum when revving? Could be wrong. At any rate, that's a huge help!
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From: The Shenandoah Valley
PCV is a controlled vacuum leak.
The system uses intake manifold vacuum to pull fresh air in through a filtered opening on (or connected to) one valve cover .... through the crankcase grabbing all those fumes (blowby & condensation) .... and out the other valve cover and into the intake to be burned off in the combustion chamber.
You need just one PCV valve opposite side from the filtered vent. In the old days, they vented crankcases with a road draft tube ..... lots of dirt went in them engines..
The system uses intake manifold vacuum to pull fresh air in through a filtered opening on (or connected to) one valve cover .... through the crankcase grabbing all those fumes (blowby & condensation) .... and out the other valve cover and into the intake to be burned off in the combustion chamber.
You need just one PCV valve opposite side from the filtered vent. In the old days, they vented crankcases with a road draft tube ..... lots of dirt went in them engines..
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Thanks tbear853! I actually found that the top diagram in the above comment was the one I needed. The carb intake in the back was plugged so I was able to tap in there. I figured I could go straight to the tee on the intake if that didn't work but it seems to be working fine right now. I'm trying to hone in the carb, which I will probably rebuild anyway because it seeps a bit from the bowl after driving. The PO had one adjustment screw way out and the other near normal, I'm assuming to get it running the way it was with all the horrible vacuum leaks it had. So I've been fiddling with it trying to adjust it properly so it doesn't hesitate under throttle and run like a shaky mess at start up. It's a lot better now and I'm getting close, just a little more tweaking.
I've got a '60 Falcon that has the road draft tube and you're right about them being dirty. The seals were junk when I first got it so at startup it smoked pretty bad.
I've got a '60 Falcon that has the road draft tube and you're right about them being dirty. The seals were junk when I first got it so at startup it smoked pretty bad.
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