WW2 Ford Canada Military Engines- PCV system
 

Good Day,

Responding to a PM, but I could not post photos there so here is the setup used on Ford Canada Flathead V8's for positive crankcase ventilation on military vehicle engines:

System consists of a PCV valve fed from a tapped hole at the front of the intake manifold above the gallery. A standard SAE flare fitting and 1/4" Bundy tube is used there.
One setup, as shown in the diagram and bottom photo, uses a spectacle flange below the carby that allows the PCV valve to draw a suction from inside the gallery at the front of the intake manifold.
Another type shown on the photo of the manifold has fittings at the rear of the carby stand to draw the suction. Both use an oil bath air filter on the fuel pump stand to filter the air going into the crankcase.

The spectacle piece is hard to find even in Australia. I think many were discarded in post war use. They were a die-casting also prone to corrosion. The PCV valve however I have been told is the same as used on wartime Jeeps but I cannot confirm that. The plumbing is straightforward 1/4" tubing and fittings.

Hope this is of some interest and answers a very late to respond question.

Cheers,

Re: WW2 Ford Canada Military Engines- PCV system
 

Very interesting! Just wondering - do you know what pcv valve was used?

Re: WW2 Ford Canada Military Engines- PCV system
 

The PCV shown in the pic appears to be very similar to the valve used on the 63-64 Trk 292 V8's, they threaded into the intake galley forward of the carb on the right side of the engine, then were connected to a vacuum port at the base of carb via pipe and short sections of hose. The PCV is not threaded into the vacuum pellum

Re: WW2 Ford Canada Military Engines- PCV system
 

Hi Tom,

Attached photos of the info on the valve after I chalked it up:

Donaldson Crankcase Ventilator
Take apart every 250 hrs or 10,000 miles
Wash in varnish (remover?)
Install arrow up
Donaldson (Mfg?)
St Paul (MN?)
Made in USA
US, Can, Br patents
Part No. V4 15

As an aside, Williamsburg VA? I spent 2 years in Newport News at the drydock 1969-70. I was there at the building of the USS Nimitz and the repair to the USS Enterprise after the tragic hanger deck fire. Really loved VA but wound up on the other side of the world.

Cheers,

Re: WW2 Ford Canada Military Engines- PCV system
 

Thank you! Been here since ‘95 after having vacationed here many times. Our son fell in love with William & Mary at age 8 and got accepted for the ‘99 graduating class. Once he was accepted, since we were going to move anyway for a different reason, we moved to Williamsburg to be able to afford to send him. It has its querks like any other place but we love it here .....

Re: WW2 Ford Canada Military Engines- PCV system
 

Found this last week, at the old sawmill I got a pile of engines from a few years back.
This and an old log tinker I can get , but wife would not be too impressed with them in the front yard.
Maybe I just rescue the engines and trans, the blitz has an 8ba in it.
Lawrie

Re: WW2 Ford Canada Military Engines- PCV system
 

Hi Lawrie,

They turn up everywhere!

If they had a Sunshine roof I'd even drive to Qld for it when Victorians are allowed in.
Here is a similar Chevy Blitz "Sunshine" Tropical Roof like I am looking for if you ever see one.

Cheers,

Re: WW2 Ford Canada Military Engines- PCV system
 

Thanks for sharing and documenting that setup - have never seen that in any flathead in the USA - kind of cool!

Re: WW2 Ford Canada Military Engines- PCV system
 

Most Welcome,

Yes, very unique to military engines yet they became standard features on most civilian engines 15 years later.

You can only imagine the amount of sand, dust, and dirt sucked up without it in the Western Desert of Africa during WW2. Even then, engine changeouts were fairly common.

Cheers,

Re: WW2 Ford Canada Military Engines- PCV system
 

Fordblitz, I will get some better pics later next week or the week after as I will be back down there, maybe see if I can get them towed out.
Lawrie

Re: WW2 Ford Canada Military Engines- PCV system
 

For whatever it's worth dept..... My military Jeep manuals show a pcv much like described above, maybe even the same. On a MB or GPW, it screws into the intake manifold, directly below the carb. The other side of the valve is plumbed with tubing to the valve chamber, where a road draft tube would be attached on a civilian Jeep. In as much as it is relatively easy to search out and get WWII Jeep parts, maybe a person could get a MB and GPW pcv to check it out.
The manual says that the pcv is closed at idle vacuum.

Re: WW2 Ford Canada Military Engines- PCV system
 

Thanks Lawrie,

Look forward to seeing the photos.