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[ruebarb]

fingas74 previously said:

I think the issue is that with the caps when a vacuum is pulled they actually shut off like a check valve to keep things from getting sucked in. They are not perfect so they will allow the pressure to equalize over time but while there is the vacuum there is the potential to suck water in through the seals. Seals don't generally work equally well in both directions, depending on seal type and the ones on the FJ are more for keeping relatively thick oil in not thin water out.



All I know is the water entering the differentials is not a new phenomenon. It has been noted as a problem on plenty of well built 4X4s through the years.

Well I put all of the breather in my mouth to test them before I used them, the plastic breather is 2 way, does not seal. Of the two 1/8th diff breathers, (not sure which from locker or transfer case) one was a 2 way, did not seal, they other way a one way, it would seal under negative pressure (seal when the diff cooled)

This may explain why some are worried about pulling water from the seal, using the one way valve is going to create a very strong vacuum, the pressure will need to be released somehow, so then you'd have a case where there isn't a path of least resistance, the seal could leak/ be compromised very easily.