Oil leak

[Not Now]

Just bought another Bronco, 1978, ran good home but noticed an oil leak. After I got it home I let it set and idle alittle then noticed oil by the dip stick area, so i pulled it out as it idled and the oil was pumping out of it. Is this a pressure problem or maybe a vent problem. Any ideals.

Thanks Don

 

[Seabronc]

Sounds like you may have heavy blow-by in some of the cylinders pressurizing the sump.

>-

 

[Broncobill78]

Just bought another Bronco, 1978, ran good home but noticed an oil leak. After I got it home I let it set and idle alittle then noticed oil by the dip stick area, so i pulled it out as it idled and the oil was pumping out of it. Is this a pressure problem or maybe a vent problem. Any ideals.
Thanks Don

Don,

If you've got oil coming up out of the dipstick tube then you crankcase is pressurized, could be a few things causing it. any work been done to it that you know of ? new heads maybe or a recently changed intake gasket ?

 

[Not Now]

Don,
If you've got oil coming up out of the dipstick tube then you crankcase is pressurized, could be a few things causing it. any work been done to it that you know of ? new heads maybe or a recently changed intake gasket ?

 

[Not Now]

Don,
If you've got oil coming up out of the dipstick tube then you crankcase is pressurized, could be a few things causing it. any work been done to it that you know of ? new heads maybe or a recently changed intake gasket ?

Thanks for your help Broncobill78

I am trying to contact the person that had it before me, to ask him those questions.

I have been completely redoing the interior and now ready for carpet, this 78 will be nice.

Don

 

[Broncobill78]

Thanks for your help Broncobill78I am trying to contact the person that had it before me, to ask him those questions.

I have been completely redoing the interior and now ready for carpet, this 78 will be nice.

Don

Well, it won't cure the *cause* of the problem but you might get away with just changing to valve covers that have a provision for a breather on each instead of just one and running the kind of breather that sports a vacuum line. You can run the vacuum line to the EGR (if you're running one of *those*) and try to pull a vacuum on the crankcase that way. If you don't want to pony-up for covers like that then just take off the cover that doesn't currently use a breather, put it on the drill-press and make yourself a breather hole. Get a second breather grommet and install the second breather. This worked for me when I ran a bad silicone bead on my 460 intake and was just too pressed for time (ok, read that as lazy) to pull the dizzy & fix it correctly. Understand that it doesn't do jack for the underlying problem but it might stop the oil from spraying out of your dipstick if the gasket problem isn't too serious (and *if* it's a minor gasket issue causing it, don't forget that this fix just masks the symptoms, it's freaking great if you're trying to sell the truck, put a colored hose cover over the vacuum line & most pinheads will Ohhh & ahhh over it) Of course instead of a breather you could just use a second PCV valve, it's all good as long as both heads are seeing vacuum and heck,everyone loves a cheap fix.