Dirty Oil- PCV Fail?

[JSeery]

Might try a lower vacuum source or restrictor to lower the air movement. You would also benefit from installing thermostats. You could install them in the upper hoses near the radiator. With typical modern thermostats you would need two hose clamps on each to hold it in place. Another approach would be the inside the hose thermostats similar to the originals.

[flatford8]

A friend of mine added a length of hose to the crankcase vent to get it beyond the passenger compartment. His wife didn’t like the smell in the car. It worked in his situation. I don’t know if the length of the road draft tube would make a difference on how well the system vented. My guess would be yes......Mark
PS....”I bought an old truck to drive an old truck with old truck equipment.”
Old vehicles can and do stink...LOL

[Talkwrench]

It might just be the oil, high detergent holding the crud in suspension ? low heat ?

[SofaKing]

JSeery, Talkwrench, no doubt thermostats would be helpful. I mentioned why they are not installed atop the head. I did not mention that I tried them at the radiator inlet. What I observed is they did not modulate well. The temp would climb and drop in sharp, repeated spikes as the thermostat opened and closed. The stove top test of stats was ok; Decided to go without. I considered adding a restrictor to the .250” pcv line but not that motivated at the moment.

Flatford8, when I bought it there was a paper defroster tube from the pump stand to below the left running board. Puzzled me at the time, being my first exposure to flatheads. Regarding old truck equipment and smells; everything mechanical is a compromise. Turns out I don’t like this particular compromise and I feel no obligation to the status quo. Been wrong before, will be again...

[flatford8]

Did that tube running underneath work?.....I have stationary engine that has flex pipe out of the pump stand, but I don’t remember where it runs to......Mark
PS...looks like it just runs into the exhaust...the exhaust may have been plumbed to the outside of the building the engine was in.

[SofaKing]

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Originally Posted by flatford8

Did that tube running underneath work?.....I have stationary engine that has flex pipe out of the pump stand, but I don’t remember where it runs to......Mark
PS...looks like it just runs into the exhaust...the exhaust may have been plumbed to the outside of the building the engine was in.

Truck was not running for 40 years prior to my buying it so I don’t know. I would expect it kept fumes out of the cab but think it would have screwed up the airflow. It was essentially another road draft tube at the top of the engine and it does not benefit from even the principle of heat rising.