The Ford Barn

Bruce Lancaster · 10-17-2017, 12:47 PM

Canadian trucks and carriers got the PCV system. My info is from scattered hints in a bunch of different manuals, mostly from CMP trucks, and I have posted a bunch on them here.
PCV first appears in the 1943 edition of the truck manual, no way to tell how much earlier the hardware appeared, but certainly on the C29 engines. I've slowly gathered most of the bits, actual valve seems to same or similar to the USA jeeps.
I think the picture above is of the early version...my manifolds have that pickup hole left cast closed and a new port added into the right side of the manifold where it rises to mount the generator. The one shown uses the truck vacuum brake hole, a big 3/8 pipe hole that has two much smaller holes through into the two sides of manifold. The possibly later one inhales at front of manifold and gets its suction from a plate under carb that branches into the two sides of manifold with small holes, very much like the hookup used with Southwind heaters. It's also possible that the 2 arrangements were for trucks with and without power brakes, but I suspect they moved the port because there was too much oil being flung around at the back.
All the manifolds were Canadian 11A types which had casting provisions for several arrangements covering the several vacuum arrangements on current and earlier flatheads.

10-17-2017, 12:47 PM	#12
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: PCV Valve Canadian trucks and carriers got the PCV system. My info is from scattered hints in a bunch of different manuals, mostly from CMP trucks, and I have posted a bunch on them here. PCV first appears in the 1943 edition of the truck manual, no way to tell how much earlier the hardware appeared, but certainly on the C29 engines. I've slowly gathered most of the bits, actual valve seems to same or similar to the USA jeeps. I think the picture above is of the early version...my manifolds have that pickup hole left cast closed and a new port added into the right side of the manifold where it rises to mount the generator. The one shown uses the truck vacuum brake hole, a big 3/8 pipe hole that has two much smaller holes through into the two sides of manifold. The possibly later one inhales at front of manifold and gets its suction from a plate under carb that branches into the two sides of manifold with small holes, very much like the hookup used with Southwind heaters. It's also possible that the 2 arrangements were for trucks with and without power brakes, but I suspect they moved the port because there was too much oil being flung around at the back. All the manifolds were Canadian 11A types which had casting provisions for several arrangements covering the several vacuum arrangements on current and earlier flatheads.