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The importance of a working diff breather

Transmissions, Transfer Boxes, Axles, Drive Shafts

The importance of a working diff breather

Postby Michael » 02 Nov 2016 08:10

So I just wanted to share one of my findings on a Patrol rear diff. The diff was whining quite a bit and I decided to remove it for inspection.

Firatly the oil was in very bad shape, looked like old diesel oil.
When I removed the sedeshafts I saw areas of rust which already gave me a hint that water must have been in the diff.
The crownwheel told the reat of the story.

All of this was due to the breather pipe that got disconnected from the breather line just above the diff which allowed water to ebter the diff.

So one tip of advice, make sure your breather lines are in working order......it might save you a diff
Attachments
IMG-20161102-WA0003.jpg
Disconnected diff breather
IMG-20161102-WA0003.jpg (104.24 KiB) Viewed 319 times
IMG-20161102-WA0001.jpg
Sudeshaft
IMG-20161102-WA0001.jpg (89.9 KiB) Viewed 319 times
IMG-20161102-WA0000.jpg
Diff
IMG-20161102-WA0000.jpg (114.7 KiB) Viewed 319 times
IMG-20161102-WA0004.jpg
Crownwheel pits
IMG-20161102-WA0004.jpg (89.46 KiB) Viewed 319 times
"The Just shall live by Faith" Rom1:17

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Re: The importance of a diff breather

Postby iandvl » 02 Nov 2016 08:13

Michael,

Thanks for the tip. I'll check mine asap.

Edit: Sorry to hear about this. :(
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Re: The importance of a diff breather

Postby Michael » 02 Nov 2016 10:13

Ian, this diff is not from my Patrol but one I am working on.

But yes, I also have simpathy for the owner as the vehicle has very low mileage on.

This is so easily overlooked, but can cause major damage. I have only checked mine once ever so will also chexk mine asap
"The Just shall live by Faith" Rom1:17

Check out my build here My Patrol
And my engine rebuild here mostly engine related stuff
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Michael
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Current 4x4: Patrol GU 4.2 Turbo Diesel
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Re: The importance of a diff breather

Postby Anthony Forgey » 02 Nov 2016 10:27

Over the past few weeks I have been sorting out bits and pieces on the Patrol. I found that the breathers were disconnected near the gearbox where the flexible hoses connect to the metal ones. I checked for debris, tested for airflow and reconnected.

Water in the diff is a silent killer.
'98 Patrol 4.2D

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