Thread: jag ind rear breather problems

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Roger ( and others)


The whole porpuse of a breather is to somehow separate oil out of an oily vapor mix and return the oil liquid to the sourse while venting the vapor PRESSURE to the atmosphere--it is also necessary to somehow relieve an negative pressure in between these positive moments---


Now---with a plate (stock cover) between the housing and the Bing, it is only necessary to put a drainback (hole at bottom) and some other holes somewhere up above the liquid level and out of direct sling off area of the fluid--that will creat the separator and it only has to be vented to atmosphere by what could be a single hole as small as 1/16 to 1/8 inch---


And the fluid level will maintain itself at the filled level minus only the small portion that will be separated in the breather (volumne of cover to bling

Originally Posted by jerry clayton

Roger ( and others)
The whole porpuse of a breather is to somehow separate oil out of an oily vapor mix and return the oil liquid to the sourse while venting the vapor PRESSURE to the atmosphere--it is also necessary to somehow relieve an negative pressure in between these positive moments---
Now---with a plate (stock cover) between the housing and the Bing, it is only necessary to put a drainback (hole at bottom) and some other holes somewhere up above the liquid level and out of direct sling off area of the fluid--that will creat the separator and it only has to be vented to atmosphere by what could be a single hole as small as 1/16 to 1/8 inch---
And the fluid level will maintain itself at the filled level minus only the small portion that will be separated in the breather (volumne of cover to bling

Jerry, I mis-understood what you were saying about the way the two covers would work, and it seemed to me that you were suggesting that the void between the two would remain empty, there only for a vent area. Obviously that's not what you meant.

I would suggest that if you used both covers you would want several large holes at the bottom, or even a significant portion of the stock cover cut away so that the lube level would equalize quickly during fill. A small hole at the top, and equally a small vent in the "quick change" cover would handle the venting both ways, out and in. The only concern would be getting the outside flange of the stock cover smooth and flat to seal to the "quick change" cover.

But I think I'd try the vertical coil of tubing first......

Many off road racers and others who work their off road trucks use "catch cans" on their diff and transfer case breathers. They are actually small expansion cans very similar to the ones used on radiators, with a fitting inlet connected to a tube that reaches to within a fraction of an inch of the bottom of the can, and a filtered vent fitting on the top of the can. Any oil that gets caught in the can and reaches above the level of the bottom of the tube gets pulled back into the diff as the cooling draws air back in through the filtered vent. However, in your situation, one or another of the fixes already put forth should work quite nicely; my suggestion is just another bit of fodder to toss in the idea mixer.