| Re: Diff breather extension
Hugh,
>> I managed to easily 'rebuild' the rear valve <<
>> (it was in relatively good condition, so I left <<
>> the spring and the rubbr flapper). <<
The breather rebuild is to intentionally remove the spring and the rubber flap. These allow air to exit but do not allow air to enter the diff. This one-way valve is what causes the (unwanted) vacuum in the diff. When you have a vacuum, air/water/grease can get sucked in from somewhere; usually past the axle tube seals. After the breather is modified (i.e. open,) clean air from the higher location can get sucked into the diff.
-B- |