Crancase Ventilation Puzzle?!???!?

[Anonymous]

I've spent the past few months piecing my Maverick's body back together after the wreck and now I'm switiching focus to the mechanicals.

Ever since I bought it 6 monhs ago, the vacuum and PCV lines have been a mess--we're talking a tangled mess of heather hose clamped around fuel hose clamped on to vacuum line, etc...you get the idea. The vacuum lines I've figured out, but the PCV flow I haven't figured out.

I have a 72 Mav with a 250 L6 w/ carter carb, btw. I'm beginning to think that some components of the engine may NOT be original--I say this becasue my engine doesn't seem to match any pic s or diagrams I find that show the location of the PCV valve/oil filler cap/orientation of the air cleaner are different/reversed. I know the valve cover is aftermarket (chrome, JC Whitney, more than likely) and I think the Air cleaner is from some other ford vehicle.

What I need to know is this: what goes where?

right now, the oil filler cap has a hose that clips to the air cleaner, into a filter. and the pcv valve has a hose that leads to a port at the base of the carb (what is this port? it's larger than a vacuum line and emits vapor when open)...is this right? or is this all reversed?

tell me your 250 is configured, so I can figure it all out

thanks in advance

AP out

 

[simon]

your setup is correct for a '72 250 (and any other '68-up ford six cylinder closed emissions system, for that matter): breather on valve cover hooked to air cleaner, PCV hooked to carb base or spacer.

If you want to use an aftermarket air cleaner; you don´t necessarily need to hook the closed-style breather to the air cleaner; any open style breather will do the job as well.

 

[pedal2themetal45]

right now, the oil filler cap has a hose that clips to the air cleaner, into a filter. and the pcv valve has a hose that leads to a port at the base of the carb (what is this port? it's larger than a vacuum line and emits vapor when open)...is this right? or is this all reversed?

This is corect..
the hose going to the air filter is the inlet for the air for the PCV and the hose going to the base of the carb is the out of the PCV.
So it goes
sucked throu the air filter housing and thou the little filter of its own then through the filler cap and out throu the PCV valve into the intake and throu the motor to burn the vapor and out the exhaust...
Tim

 

[Anonymous]

thank you both for the quick response.

and now a question: what type of hose/fitting is used to connect the PCV valve to the carb base. right now, I have fuel hose over the tip of the PCV, with a piece of heather hose linking the smaller hose to the carb base...what type of fitting was used originally for this? pics? part name?

it works the way it is now...but it's um....unsightly

thanks again

-AP

 

[jamyers]

"Brass Pipe-Threaded Hose Barb" - Head to Lowe's, Home Depot, or any decent hardware store and pick up one with pipe threads sized to fit the tap in the manifold (I think 3/8"???) and big enough for the PCV hose (1/2"???). Oughta cost maybe 2 bucks.

Here's a pic of mine - large PCV on the left of the elbow, small distributor vacuum to the right (front). If you've got a SCV carb and dizzy, you won't need the elbow, just put the PCV straight into the manifold.

 

[pedal2themetal45]

HI
There should be some PCV hose Or fuel line hose of 3/8 inside. heater hose isn't going to be strong enough I beleve and well colapse under the vacuum. The hose needs to be reinforced hose like fuel hose.
Tim