<VV> Gear Oil Blowing out Vent

[James Davis]

Chevy moved the position if the diff vent around to try and mitigate 
the oiling problem.  As I can see, none of the positions solved the 
problem. My opinion is the pinion wimps the oil to a mist which is 
slung up into the vent top and drips down around the edges.   Walt 
Davison (longtime UltraVan owner) removed the vent and replaced it 
with a six inch long 1/2 inch dia. tube filled with a brass kitchen 
pot scrubber.  I doubt that would work on a car as there isn't the 
room.  I welded in an "S" sheet metal baffle on the underside of the 
cover over the vent.  It eliminated the oil coming out the 
breather.  Mike, I will send you a picture of the baffle if you like
Jim Davis




At 12:36 PM 6/17/2007, Mikeamauro at aol.com wrote:
>For some time now, my 67 PG coupe has had a propensity to blow axle gear
>lube out the vent. As one might imagine, the tendency is greatest 
>when the lube
>level is at its highest, proper level (just at the bottom of the
>fill/inspection  hole), When enough lube has blown out to lower the 
>level to 1-pint low,
>the blow  out stops. I'm using synthetic gear lube, but the blow out 
>has  equal
>with synthetic or standard lube. After a run down the highway  and stopping,
>the drip offs typically equal two or three spots about 2" in  diameter.
>
>Has anyone had the same issue and solved it; and, if so, what was the root
>cause?
>
>Thanks in advance for any leads.
>
>Mike Mauro