Front Diff Recurring Problem

[STU100]

Owned the Bongo for 3 years now - shortly after I got it, humming noise from the front diff. Repaired by seller. Last summer humming diff again and oil leak. Had it inspected and repaired again. Driving on motorway 6 months ago - major diff oil leak. Advised to replace entire front diff unit and driveshafts. Sourced a replacement diff and had it fitted. 3 months ago again on motorway drive shaft inner seal failed - leaking oil. Had this replaced but now the diff is hummming again. Has anyone experienced this before? Is there something that might be causing these recurring problem that I haven't considered? Been suggested that I replace the unit again but am reluctant to do this if going to happen again. Any advice gratefully received.

[rita]

Personally I would convert to 2WD.

What size of front and rear tyres does the vehicle have.

PS if you are going for a repair again you need to get the transfer box Viscous coupling checked out

[Bob]

As Rita says, definitely make sure your tyres are the same rolling circumference.

Good luck.

[Northern Bongolow]

if your wheels and tyres are the correct size etc, do a search on youtube for how to test a viscus coupling. this shows how to hang a weighted bar on a stud to time the drop etc.

on top of the diffs and transfer box there is a breather, they tend to rust up closed. i screw and twist them to free them up. if they cannot breathe they may force oil out of seals or run hot.