Letting Diff Cool

I can only say ... yes I do let my diffs cool maybe as long as it takes to walk the water and set my path ........... I'm sure i will be corrected here but I'm led to believe to drive through water over a hot diff creates a low pressure within the diff and water is thus drawn in through gaskets or seals etc.

I also have diff breathers and a breather for the gearbox set high in the engine bay.

Thanks
Brian

Beautiful guys,

thanks heaps... Yeah mate i was spewin when the mechanic told me the repars will be about 2,000 after need a reco new lsd diff...

And as i said the diff breathers are extended so we're not sure what or how it happend... I do tend to let the diffs cool for about 3-5minutes...

If anyone has any ideas as to how to keep the water out what do i do?

How do i pressureise the diff?

Justin

that sounds crazy! As someone else said, wouldnt that just drive out the oil?!?!?

Should i really be risking my 2000 dollar diffs by a air horn compressor? lol

I dunno!!!

Justin

If you had your diff and gearbox breathers extended high enough ( I usually run them up to under the bonnet), they are not blocked and your seals are in good condition water will not get into the diff, even so if you have been doing water crossing you should always check you diff and gearbox oils just to make sure.

When you fitted the extensions, did you take out the one way discs from the original caps so they could 'breathe'? If not then the breathers may have been blocked and it wouldn't matter how long they were. Do the ends of the breathers get wet? Do they have filters fitted or open ends? Do the ends point up or down - just some thoughts. If the breathers can breathe and the tops can't get water in them they should work a treat.

$2000!!! Just for the rear diff rebuild.

A mate is getting both his diff ratios changed to 4.11’s with new LSD in the rear for $2200.

Get another quote for the job, I would also spend the extra and fit a Detroit True track LSD over the clutch LSD as the True track will be 10* better and never wear out.

What type of diff is it; I may be able to get you some cheaper partes for it.

Cheers.

Cipher, I have just had the rear diff in my hilux rebuilt with true track LSD,water caused the problem , diff specialist told me to carry oil & change it after crossing deep water especially if it is a long drive to home.I go to cape york or territory every year early in wet season so my vehicle has seen a lot of deep water crossings always changed it when i get home .Never had a oil leak & never been milky when changed but was informed that it doesn,t take much to do damage.
Friar

Where I am in WA we dont need to do crossings, but why cant you just drill and tap a 1/8"BSP plug up the middle of the drain plug (lowest point of diff) and after a crossing stop for a minute to let oil settle then remove small bung to see if oil or water comes out? Water will be at the lowest point if present, just like your water/fuel sparator. So long as you dont keep driving so it amalgamates (milky)
Will save doing an oil change EVERY crossing?

If your diff breathers are free of all interference your diff should suck air through them well before the oil seals.....
I am not a fan of puting those fuel filters at the ends of them because i feel they could well be interference.....

Thank Christ I like to tinker and I'm connected with good mechanical mates.

Had my rig decide to operate in two wheel drive only on Monday. Rear wheels only.

Bugger. Had to get pulled out by a mate and I hate that. At least it wasn't the mate there in a jeep....

Anyway turns out it was a sticking Aisin manual locking hub that had had water in it.

But I'll bet that if I'd taken it to one or two of several repairers and just said fix it I'd have got stories that varied from busted CV joints to diff rebuilds. My mechanical mate agrees with me. He's seen it happen on more than a few occasions.

Anyway, did the wheel bearings while we were in there so it cost me $85 for some bearings and a handfull of grease.

I guess I cheated some dodgy mechanic out of a couple of g's for something he didn't have to do.

Dave

Is it possible that water gets in not beacuse the air inside the diff shrinks but because the metak of the diff warps when it is suddenly cooled?
Just a thought

R