Posted by Clint Dixon [172.68.90.97] on Thursday, January 04, 2018 at 10:05:50 :
In Reply to: Re:what is a donaldson valve posted by junkyardog [162.158.62.210] on Wednesday, January 03, 2018 at 20:16:20 :
Here is a new one disassembled. I believe this one is reversed and will not work correctly on a Power-Wagon.
Power-Wagons and industrial engines did not use road draft tubes to clear gasses out of the crankcase. They used a positive crankcase ventilation system. As Milo said below, the Donaldson valve is the "PCV" valve as it is called today. Also no filtered cap on the oil filler tube. A sealed cap was used and a hard line or hose connected from the side of the filler tube to the carb to pull in filtered air below the air cleaner into the crankcase.
Junior