Vehicle Emission Control Decal

[BigBrother-84]

Hi Gentlemen!

I am in the process of reproducing Big Brother's Emission Control decal.

Here is the original:


While doing it, I am analyzing what equipment piece is remaining and which is gone.
I am surprised  to see that, although Big Brother's vacuum system doesn't have a lot of components missing possibilities, there is not a lot of stock that's still there...

The missing parts are the 3 port PVS and its Vacuum Restrictor, plus the Solenoid Vacuum Valve and its VDV and VOTM.


Question 1:
Please help identify the part placed between the Distributer and the Carburetor 90° direct connection:



2-Although Big Brother's vacuum diagram doesn't show one, there is an EGR valve.   Probably came with the "new" 351W swap? This one is simply disconnected.
Should I block it in a different way (remove it, install a plate, etc) or leave it that way?


3-Solenoid fittings:  What's the goal and what are they looking, any picts?


Since the truck is running very well, I am wondering if I should install new ones...

[Gary Lewis]

Q1: Vacuum restrictor = VRest

Q2: If the distributor is the original one, which means it was curved to work w/o an EGR valve, and if the engine is running well I'd leave well enough alone.  But you could pull the EGR valve and put a block-off plate in there to ensure there isn't an exhaust leak.

Q3: I don't see the stuff in your two circles save for the VRest.  So I think all of that has been removed and all you have is the vacuum line from the carb, through the VRest, to the distributor.  Am I missing something?

I have to go now, but if you want to delve further there's a training manual here that might help: Documentation/Emissions/Understanding Emissions Controls.

[BigBrother-84]

Gary, don't rush... Big Brother runs this way since at least its "new" engine (2013) and possibly before that.


I don't plan to modify anything, unless any added part could improve Big Brother's fuel consumption, or if any missing part has an impact on engine performance (timing or similar).

Gary Lewis wrote

Q1: Vacuum restrictor = VRest

Q2: If the distributor is the original one, which means it was curved to work w/o an EGR valve, and if the engine is running well I'd leave well enough alone.  But you could pull the EGR valve and put a block-off plate in there to ensure there isn't an exhaust leak.

Q1-Thanks for identifying, I'll put this remaining part in green on the included diagram (see lower).
Q2-Original distributor, yep.  So I'll cap the EGR to be more secure.

Gary Lewis wrote

Q3: I don't see the stuff in your two circles save for the VRest.  So I think all of that has been removed and all you have is the vacuum line from the carb, through the VRest, to the distributor.  Am I missing something?

The green parts on the diagram are the remaining ones, the red ones are missing.
I included pictures to simply illustrate Big Brother's current vacuum system state, compared to its diagram.

[85lebaront2]

The only item I might want on it if it were mine, the early emission systems used a PVS that was set at 210°F so that if the engine got too hot, it would advance the timing (bottom port to ported spark on carburetor, center to distributor, top to manifold vacuum). I hay have one of those (or more) if you want to add that.

[Gary Lewis]

I'm with Bill - What you have is working, but if you want to change add the PVS.

[BigBrother-84]

Bill, do you have a 3 port PVS?

And am I ok to presume it will screw there?

[85lebaront2]

I will need to check, it might be a couple of days before I get to go dig in the toolbox drawer.

[BigBrother-84]

Bill, as I have already said to Gary, it's anything but an emergency!
😉

[BigBrother-84]

Guys, went to NAPA for something else, and they had a 3 port PVS in stock...  I bought it.


And I'm waiting for my local print shop to print the replacement decal I reproduced:


Here's Big Brother's original (was able to save it from original rad support, but cannot stick anymore to the new support):



The fonts aren't exactly the same, but pretty close.

[Gary Lewis]

Looks great, Jeff!  

[Rusty_S85]

Id be interested in knowing how well the print shop did and how well the decal lasts long term.

I have for the most part finished making mine but havent been able to decide how to have it printed since it has to live under the hood exposed to engine bay heat and chemicals.

[81-F150-Explorer]

I would be interested as well. I have various engine decals that need replaced.

[BigBrother-84]

I should receive the decal next week.  Supposed to be their best quality, no bubbles, etc.

Will keep you in touch.

[BigBrother-84]

Gentlemen, what advice for PVS installation, any scellant, threads lock, or others?

[81-F150-Explorer]

I would use a light wrap of plumbers thread sealant tape.  

[BigBrother-84]

That makes sense.  Since this is not a fuel pipe, no reason a plumbing tape couldn’t do the job.

[85lebaront2]

Just as well, I apparently either packed them in a container in Newport News VA or didn't save the ones I had.

[BigBrother-84]

No problemo, Bill, I got one, was stock at my local NAPA.

[BigBrother-84]

Gary Lewis wrote

I'm with Bill - What you have is working, but if you want to change add the PVS.

Ok, here is the situation about rebuilding the PVS vacuum circuit:

1- Big Brother’s situation before my modification:

I thought that the distributor was connected to the carburetor:



With this Ford Vacuum Delay Valve #E3AE-DA between the two:



Well, it looked being connected… if there wasn’t a steel ball blocking the tube!



Ok, so let’s start again: Big Brother’s distributor WASN’T vacuum connected, period.

2- Rebuilding the vacuum circuit:

I installed a new PVS 3 port valve, and connected the “D” port to the distributor:



Now, I have to plug the port 1 and 2 to something.  Remember, I am rebuilding only the distributor vacuum circuit, not the "solenoid/throttle" one:


3- Questions:

A) Plug the tube with Vacuum Restrictor on port 1 or port 2?
B) Can I use the «Ford Vacuum Delay Valve #E3AE-DA» as the "V REST" shown on the diagram?
C) What’s the goal of such restrictor, since there is a parallel vacuum tube without restriction?  Do I have to NOT install this not restricted tube?


EDIT:

Here is my proposal. But still doesn’t understand the goal of an unrestricted parallel tube…

[ArdWrknTrk]

Hi. Jeff

We have similar vacuum advance setups.

(A) the vacuum restriction goes to port 1
As shown it is farthest from the threaded end of the thermo-valve.

(B) The delay valve is not a V-REST.
I can try to get you a picture of mine if it would help.
Edit: photo of yellow switch valve and blue V-REST


The restriction limits the amount of vacuum reaching the advance diaphragm.

(C) The point of having an unobstructed path is so that vacuum can be used to control idle speed.
The valve in the thermostat neck will shift to straight manifold vacuum in the event the engine starts to overheat.
This pulls the idle speed up a few hundred rpm (which turns the fan and water pump faster)
This means if the truck were stuck idling in traffic it would make an attempt to cool itself off without much affecting performance off idle.

This is essentially "vacuum logic" that was common before computers and electronics in vehicles.