Pcv Question...

hi, on my Fhead the pcv valve is bolt to the intake manifold instead on the exhausts valve cover, and it have this bulge on the top cover and i hooked it to the pcv valve..
now my question is do i need to connect the exhausts valve cover breather to the pcv also? currently its plugged.

 

Check this out.
http://www.earlycj5.com/xf_cj5/index.php?threads/112840/
Seems like there were a couple ways they'd have been configured.

I can't see the last 2 images you posted but does your dipstick tube have a nipple on it? If so, there would have been a hose running from that to the original Oil Bath air cleaner. This would have also served as part of the "emissions" system by recapturing some gasses.

 

Yes the dipstick have a vent hole on top, i installed a small air filter there.
Is that enough for the crank ventilation? Or should i connect the exhaust cover to the pcv? My oil pressure is around 80psi btw.

 

Read this: https://oldjeepcarbs.com/thread/76/pcv-134

 

well i dont have use for a vacuum, i have electric fuel pump... so my question is still do i need to hook the plugged hole to the pcv or can i leave it plugged and the crank vent will be from the dipstick breather?

 

My friend. These motors were designed to work correctly with a specific set of equipment. Bypassing the PCV system is going to cost you a lot of money sooner than you think.

 

I dont want to bypass it, i want to make sure its set currently...

 

Then let me ask you a question. Why do you have an electric fuel pump?

 

The PCV on your F134 appears correctly setup. It connects to the intake manifold just above the distributor. It just screws in and then connects via a rubber hose to the top of the rocker arm cover as you've done. You can order a new PCV from NAPA or Rock Auto or a number of different auto supply stores. The original part number for the PCV is 941311. Standard Motor Products makes a fine one. Mine has the same setup as yours and I spent about a two hours last Saturday pouring through the Factory Service Manual and the Master Parts List to find the correct illustrations to confirm what I was seeing on the F134. As the F134 evolved over time, it appears the design engineers enjoyed messing with the PCV location and setup to adjust for other changes in the engine design.

 

Where does the hose on rocker cover go?

Normally that tube is where fresh filtered air enters the engine when used. The dipstick tube is also an entry point for fresh air for other applications. All systems had a pcv valve that metered airflow inversely to vacuum pressure.

The pcv valve allows a lot of air through at full throttle (little engine vacuum) and less air passes when at idle (high engine vacuum) otherwise you idle on mostly oily crankcase air that will foul the spark plugs.
The pcv valve is what connects to the exhaust side lifter cover and has a vacuum line to the intake manifold or lower carburetor.

 

Based on the illustrations in the Factory Service Manual and the Master Parts List, the line from the rocker arm cover goes to the engine block through a PCV valve screwed into an elbow that is connected into the intake manifold. See illustrations below. Note on the exhaust side there is no breather as is seen on other F134's.


And here is the other side.



If there is more to it than this, please let me know. It's an important component to a properly working engine.

Thanks!

 

I'm afraid you have the PCV airflow pattern backward. The crankcase vents to the valve train at the top and the oil filler tube at the bottom. At idle the vacuum created in the manifold is at its highest. The air in the crankcase is drawn out by this vacuum through the dipstick tube through the PCV valve and into the intake manifold to be dispersed to the cylinders for consumption. I cringe whenever I see someone has placed a tiny air filter on the outflow tube. This defeats the purpose of a PCV system and shortens the life of the motor.