Oil leak

[Benjamin D]

Hi I have a 51 m37 it’s been leaking oil so I did a dye test. I’m leaking from under the bell housing and it seems like oil is getting blown under the truck , it’s all over back of transmission and transfer case, I even saw green dips off the rear differential. But the most alarming is I saw green on the line that goes from bottom of the carb to the intake manifold, and I had green dye show up in the oil bath air cleaner. Any help would be be appreciated, thanks.

 

[G744]

Perhaps you might check the routeing of the vacuum & atmosphere lines for the several fording destinations, looking for improper connections.

Also, pull the PCV valve and make sure it isn't plugged.

G744

 

[NDT]

Leave it parked and running at high idle to eliminate the wind blown issue. All Dodges will mark their territory but maybe yours is excessive. Look for a puddle on the ground and follow the drips. Might be the rear main seal if it’s coming from the bellhousing plug. For sure verify your crankcase ventilation is not plugged like G744 said. Pressure in the crankcase will force oil out here and there.

 

[JimC2]

Do M37s have pcv valves ?

 

[NDT]

Do M37s have pcv valves ?

Why yes, it’s plumbed in with 1/4” pipe fittings near the tappet chanber cover if I recall correctly.

 

[JimC2]

Durn, I've owned my 37 for sixty three years and my 708 for over fifty, and I didn't know that. Learn something every day. I thought pcv valves came into use in the sixties when environmental factors started becoming an issue. I thought California was the first state to require them, in 1961. For example, my 67 Mustang has one; I wonder why my 55 T-Bird doesn't ?