PCV valve for my H six ?

[petehoovie]

Originally Posted by 51504bat

Not sure on a straight 6 but when I made the PCV system for my 8ba I replaced the road draft tube with a rubber grommet that a PCV valve fit in. I then routed a hose from the valve to t threaded port in the intake manifold just below the card. I left the original oil fill/breather cap in place. I used a PCV from a 231 Buick since I was advised to use a PCV from a similar displacement engine.

[cadillac512]

Gary, I like your plan for routing. I "reversed" the airflow of my 8CM V8 and installed the pcv in the oil fill/vent standpipe. I removed the road draft tube and used a small motorcycle oiled media filter (K&N)to filter incoming air. My thought was to draw the air into the pcv at a high point where the water vapor and heated crankcase fumes will tend to collect. So far, and 3 years later with 20,000 miles on the engine it has worked perfectly in all seasons with no sign of any condensation or sludge in the engine. No cab fumes either.


Terry

[GB SISSON]

Thank you all. It looks like this will work either way I decide to plumb it. When I returned home with my parts for the pcv system I parked the foyota and walked up to the truck parked outside in the grass, I noticed a strong smell of gasoline from 10' away. I sealed the tank last year with por 15, paying strict attention to all the steps but last weekend I noticed some leakage from under the seat. I pulled the tank, filled it to the top with water and found no hint of a leak, 100% dry. I decided the leak was in the bottom fitting and running down the line and dripping into and flooding the cab bottom pan. Well, I pulled it again yesterday and plan to pressure test it today. My seat base is in poor condition and has been sagging down to rest on the tank. Last week I put about 1" of dense foam from a camp sleeping mat on top of the tank where the seat rests to further support the sagging seat. That was a poor idea as the tank had now become structural. It is supported only at it's outside ends and with my gravel road in poor condition and rear leaf packs of 14 heavy springs I'm afraid I flexed the seam that runs around the tank. I will know after I put about 5 lbs of air and hit the tank with soapy water. I have 2 other tanks if needed. I will proceed with the pcv project once this more pressing issue is resolved. Arrrrrgh!

[GB SISSON]

With 5 lb pressure I immediately found the culprit. A deep pit all by itself. I found a corresponding pit on the cab floor under the tank. It appears that something like a tool or a nut fell between them years ago. I sanded with 40 grit, drilled a few tiny holes through the pit for tooth, wiped with acetone and covered the area with fuel proof epoxy paste, squeege'd in a 6"x12" piece of fiberglass cloth then another dose of epoxy wetting out the cloth fully. I will drive with a 12 gallon poly outboard tank plumbed into the bed for a week till the epoxy gets fully cured.
I will reinforce the seat frame and perhaps make a 1/2" spacer around the seat frame for added insurance. Ok, I can now proceed with the original topic at hand..... Thank you for your patience!

[GB SISSON]

Here I am again, no pcv valve yet but I have all the parts in hand. My plan is cut off the 1 1/4" dia road draft tube that drops out of the valve chamber. leaving about 6" vertical pipe heading south. I have a 180 degree U shaped bend of 1 1/4" thick walled aluminum tubing and some pieces of 1 1/4" hose for connectors. This will get what was the road draft heading upwards betweeh the carb and the firewall. Into this I will insert a grommet and the toyota six cylinder 90 degree pcv valve I picked up at napa. The gasses will be flowing in Henry's prefered direction and all that will show is the end of the aluminum tube, painted black and the intake will be the original standpipe and cap, far away from the front wheel's road dust. I have 3 Dr appointments on the mainland tomorrow in preperation of an aortic valve replacement which may be as early as the following Tuesday. After that I will get this other valve installed in my truck. Seems there's always something getting in the way of my projects. Sheesh. Edit:

Just added this photo of my 'U' to get the road draft tube heading north. It's from an old hand truck I cut up 5 years ago. Most pcv valves need to mount vertically.

[petehoovie]

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Originally Posted by GB SISSON

Just added this photo of my 'U' to get the road draft tube heading north. It's from an old hand truck I cut up 5 years ago. Most pcv valves need to mount vertically.