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Old 12-07-2019, 02:18 PM #16
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Quote:
Originally Posted by BoomerBob View Post
These two statements conflict with each other. Only one can be true. It either did or didn't release pressure when you removed it. They can appear to be the same functionally but not in practice.
Sometimes when I change the fluid in the rear diff I've had the same thing happen to me and couldn't figure out how there could be pressure to be released. In my case I believe it was a slight vacuum and not pressure at all. These diff's build up heat in the summer(expanding the air) and release that pressure. Since these valves are only one way, when the temps drop a lot in the winter and the air inside the diff condenses it makes sense to me that it could leave a slight vacuum. When you open the thing up it may be hard to tell the difference. I always open the fill hole first to before I drain the diff to make sure it's not stuck and that's when I've heard this.
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Last edited by JMat; 12-07-2019 at 02:42 PM.
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Old 12-07-2019, 04:20 PM #17
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Quote:
Originally Posted by JMat View Post
Sometimes when I change the fluid in the rear diff I've had the same thing happen to me and couldn't figure out how there could be pressure to be released. In my case I believe it was a slight vacuum and not pressure at all. These diff's build up heat in the summer(expanding the air) and release that pressure. Since these valves are only one way, when the temps drop a lot in the winter and the air inside the diff condenses it makes sense to me that it could leave a slight vacuum. When you open the thing up it may be hard to tell the difference. I always open the fill hole first to before I drain the diff to make sure it's not stuck and that's when I've heard this.
I can see how that could happen on a one way valve which tells me this shouldn't be a one way valve. I get why it is; to keep water and dust out but it sounds like a simple breather filter that allowed air both ways would be better. For those who see a lot of mud, sand, and water or any combination of; an extension tube with the breather mounted someplace where those things can't get to it makes sense.

I've read of people drilling a hole so the tube vents inside the cab where it's always clean dry(ish) air.

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