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signsup · 02-01-2025, 05:50 PM

The WWII jeeps did not have a pcv system per se, just draft tubes coming off the side of the block. The next series of Willys jeeps had a PCV valve that ran between a metal cross over tube that provided fresh air to the carb from the air filter and was connected to the oil filler tube. This PCV valve was controlled by a cable that fed into the tub dash. And, when in the closed position would use the pressure from the engine block to help keep water out of the seals and gaskets. Then opened up again when not under water. If the driver left the system closed, it created problems so the military went to wiring up the valve and mking the driver undo the wire prior to fording. Now you know more than you wanted.

02-01-2025, 05:50 PM	#9
signsup Senior Member Join Date: Mar 2017 Posts: 205	Re: engine ventilation The WWII jeeps did not have a pcv system per se, just draft tubes coming off the side of the block. The next series of Willys jeeps had a PCV valve that ran between a metal cross over tube that provided fresh air to the carb from the air filter and was connected to the oil filler tube. This PCV valve was controlled by a cable that fed into the tub dash. And, when in the closed position would use the pressure from the engine block to help keep water out of the seals and gaskets. Then opened up again when not under water. If the driver left the system closed, it created problems so the military went to wiring up the valve and mking the driver undo the wire prior to fording. Now you know more than you wanted.