PCV and crankcase vacuum, oil blow-by - '81 F-100 I6

Huuummm,
Well it has suction........  It will pull on my finger but not enough to
feel like It's about to starting hurting, haha.  If I remove the PCV , it
rattles and if I put the palm of my hand on the hose it too has suction but
I'm just not sure if it is enough / normal.  Let's see, this hose appears
to connect in between the carb plate and the EGR housing, not sure which of
the 2 it is hooked to but isn't the purpose to feed into the intake
manifold as the source of vacuum so as to burn up the fumes it pulls
through the crankcase???

I tried a test by removing the dipstick and hooking a long clear tube to
the dipstick tube with the open end back against the firewall and point
down, clearing the engine / transmission.  On a cold start it would appear
I'm getting more exhaust (whitish smoke) thru the tube than through the
tailpipe!  I guess it surprised me because I was hoping this would suck air
in , not blow a very steady stream of smoke out  and with it oil  or at
least oil mist.  Any clues this gives to you guys as what i should look for
next?  I'm thinking I need to do a compression test to see if maybe I have
blow by on the rings, etc...  But this still doesn't help me to understand
why oil is pushing out the oil filler cap into the air cleaner housing or
the dipstick tube when it is plug with the oil stick.  This should complete
a closed loop right?

The PCV and after market oil fill cap are now saturated with oil as well as
the little air breather filter in the air cleaner housing coming from hose
on the top of the oil fill cap.

On Mon, Jul 30, 2018 at 6:33 PM Gary Lewis [via Bullnose Enthusiasts] <
ml+s12971n13158h62@n8.nabble.com> wrote:

> Good job!  That carb looks great, and with it running that well you must
> have nailed it.
>
> As for the vacuum port, not all installations used all of the ports.  I
> can't quite tell from its placement if that port is port vacuum, meaning
> that it doesn't have vacuum at idle, or is manifold vacuum, meaning it does
> have vacuum at idle.  And the only reason to ask that question is if you
> have vacuum connections you aren't sure of.  Otherwise, don't worry about
> it.
>
> Having said that, you shouldn't have oil fumes from the dip stick tube or
> the breather.  All of that should be pulled through the PCV valve unless
> you have a whole lot of blowby.  So check to see that the PCV valve is
> working properly, which you can do by pulling the PCV valve from the valve
> cover and see that it has a really strong vacuum on the bottom of it.
> *Dad's:* '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked
> 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar
> clutches
> *Blue:* 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a
> 3.5L EB & Max Tow
> *Big Blue:* 1985 F250HD 4x4: 460/soon-to-be ZF5/3.55's & EEC-V MAF/SEFI
>
>
> ------------------------------
> If you reply to this email, your message will be added to the discussion
> below:
>
> http://forum.garysgaragemahal.com/Vacuum-Control-Valve-VCV-and-harness-81-F-100-I6-tp12933p13158.html
> To unsubscribe from Vacuum Control Valve (VCV) and harness - '81 F-100 I6, click
> here
> <http://forum.garysgaragemahal.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=12933&code=cnRoZW5yeTE0NUBnbWFpbC5jb218MTI5MzN8ODIzNjgyMjU1>
> .
> NAML
> <http://forum.garysgaragemahal.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>
>

You should put a vacuum gauge on a port on the manifold to see how much you have, but the PCV valve should suck pretty hard.  And you shouldn't be seeing oil and smoke coming out of the dip stick tube as it is a closed system and air should be going in there - unless you have a whole lot of blow by.

So, a compression test might be a near-term step.  However, I don't put much stock in them.  Instead, I prefer a leak-down test.  That will tell you more.  But a compression test is easier so give it a try.