69 383 pcv valve

[polarnj]

69 dodge 383, The pcv is in the passenger valve cover, correct? It has a vac line going to the front of the carb (Edelbrock carb on mine)
Looks like there is some kind of nut holding it in, do I have to loosen that nut to remove it?

Also, the oil cap on the drivers side has a rubber hose that I guess used to go to the air cleaner, it's just out in the open right now. It has one of those chrome aftermarket air cleaners so there's nothing to attach it to. Do I have to cap that off?

 

[1970FuryConv]

69 dodge 383, The pcv is in the passenger valve cover, correct? It has a vac line going to the front of the carb (Edelbrock carb on mine)
Looks like there is some kind of nut holding it in, do I have to loosen that nut to remove it?

Also, the oil cap on the drivers side has a rubber hose that I guess used to go to the air cleaner, it's just out in the open right now. It has one of those chrome aftermarket air cleaners so there's nothing to attach it to. Do I have to cap that off?

PCV on pasenger side is correct for 1969.
If you cap it off, does the breather have vents that allow it to still work as a breather?

 

[MrMoparCHP]

Your 69 should have a PCV like this. It is just a press in, sometimes the grommet has hardened making it difficult to remove.

Alan

 

[polarnj]

Your 69 should have a PCV like this. It is just a press in, sometimes the grommet has hardened making it difficult to remove.

View attachment 695201



Alan

Yep same as mine, I wish my engine looked thst nice though!

It's stuck in there pretty good, I don't want to break anything by forcing it though

 

[CBODY67]

The crankcase vent intake on the lh side needs to get air from somewhere. Initially, they were just open with "hogs hair" for the "filter", but evolved into the one like you have, which has a tube that is supposed to attach to a rubber hose that goes/went to somewhere on the air filter assy. Many times to a snorkel, if there was one.

So, do not cap that tube on the breather. If anything, aim the tube to the cowl area.

Happy Holidays,
CBODY67

 

[68PK21 440.6bbl]

which has a tube that is supposed to attach to a rubber hose that goes/went to somewhere on the air filter assy. Many times to a snorkel, if there was one.

So, do not cap that tube on the breather. If anything, aim the tube to the cowl area.

I take it that the rubber hose from the breather cap to the air cleaner snorkel or cover/base was part of pollution control so if the breather back flowed the fumes would be ingested into the engine to be <ahem> recycled again(?).
On engines of this era many would not do any maintenance till practically the engine stopped running, thus clogged pcv valves (+ air filter) and crankcase fumes back flowing out the breather. I've come across many mainly GM Quadabog carbs where the PVC port on the base of the carb was totally carboned up/clogged due to lack of oil changes making the PVC useless (back in the day).


.

 

[volksworld]

earlier cars used a push on cap the diameter of the breather tube and the pcv valve bolted through it...later on it just pushed into a rubber grommet...they both used the same valve, the nut on top is just leftover from how they used to attach

 

[CBODY67]

The initial orientation was to re-cycle crankcase vapors, whether they went in through the pcv valve (normal operation) or through the backflow from the crankcase at WOT. End result, not a lot of impact on the air cleaner element.

On engines where the pcv baffling was not very effective, then more oil would be ingested by the pcv valve and result in coked-up passages in the carb base, clogging it, by observation.

A somewhat unusual situation happened consistently on my '80 Newport 360 2bbl. The pcv hose ran behind the 2bbl carb, sagging a bit as it made the bend to the lh valve cover. Although I was driving at least 10 miles one way, in the colder times, condensate would collect in the low spot of the hose and clog it. The hose would be physically heavier, causing more sag and such. Had to replace a few hoses once I saw what was happening! No issues in the warmer times of the year, but it was a maintenance item in the colder times of the year, back then.

CBODY67

 

[Big_John]

So, do not cap that tube on the breather. If anything, aim the tube to the cowl area.

^This^

Better yet, buy a '64-67 breather without the nipple.

It's stuck in there pretty good, I don't want to break anything by forcing it though

While you wiggle the PCV valve a little, spray some silicone spray around the base of the valve. That should help loosen it up enough to pull out.

That grommet is reproduced, so even if you rip it, you can get another. You may want to anyway if the rubber is in bad shape.

 

[polarnj]

earlier cars used a push on cap the diameter of the breather tube and the pcv valve bolted through it...later on it just pushed into a rubber grommet...they both used the same valve, the nut on top is just leftover from how they used to attach

Hmm interesting, I'm sure I'm not the first person to try unscrewing that nut on the end

 

[polarnj]

I noticed as well that the vac hose from pcv to carb has some oil in it, does that indicate a clogged pcv?

 

[CBODY67]

What goes into the pcv system can be an "oil fog" of sorts, which is why the baffling in the valve covers is needed. Especially if aftermarket valve covers (normally unbaffled) are installed.

 

[polarnj]

What goes into the pcv system can be an "oil fog" of sorts, which is why the baffling in the valve covers is needed. Especially if aftermarket valve covers (normally unbaffled) are installed.

So that oil in the vac hose is normal?

 

[CBODY67]

So that oil in the vac hose is normal?

It CAN be. How much is the KEY.

When you consider how much whirring machinery is in the crankcase, with excess oil dripping from spinning crankshaft journals, with that oil being slung off of the crankshaft counterweights at the same time, lots of collisions and oil droplets in the spinning vortex that is in the crankcase. So, yes, an "oil fog".

It IS the function of the pcv valve to recycle crankcase atmosphere (which can include any blow-by from the piston rings) into the intake tract of the engine. IF the pcv valve is not effectively baffled to prevent oil from getting into the valve, some oil will undoubtedly get into the hose between the carb and pcv valve. Of course, it should be minimized for best results.

CBODY67