Cooling diffs for water crossings

Submitted: Saturday, Jul 27, 2013 at 20:16
ThreadID: 103433 Views:1921 Replies:4 FollowUps:5
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Hi all. What is a reasonable cool down time for diffs/transmissions to cool down prior to any decent water crossing?

Thanks to all in advance.
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Reply By: Member - Michael A (ACT) - Saturday, Jul 27, 2013 at 21:54

Saturday, Jul 27, 2013 at 21:54
a cuppa and a walk through the crossing (except in the tropics )

for the tropics, A cuppa and wait for someone else or staedy as she goes.

M

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Follow Up By: Top End Az - Sunday, Jul 28, 2013 at 07:27

Sunday, Jul 28, 2013 at 07:27
Thanks Michael. I recently did a Kimberley trip and went through several deeper crossings. I am thinking you may only need 10 minutes or so although some have said you need much longer.i am looking at putting breathers in though,
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Reply By: garrycol - Saturday, Jul 27, 2013 at 22:13

Saturday, Jul 27, 2013 at 22:13
If you have proper extended breathers then it is not an issue.
AnswerID: 515458

Follow Up By: Member - PJR (NSW) - Sunday, Jul 28, 2013 at 07:47

Sunday, Jul 28, 2013 at 07:47
Ditto.

Ours are right up in the engine bay, almost touching the bonnet. We never race through deep water that's over the axles without a survey. So are we stopping? Yes, but not specifically to cool the diffs etc.

Same as we stop every now and then on heavily rutted or corrugated tracks to check out the views and places on the way. This also allows any overheated shockies as well to cool down. Never had any as yet.Broke shockies but not through overheating.

Unfortunately living at such a southerly latitude means that we have to "push it along" to get to the end of the bitumen up north or in the center but that's all the rushing that we do.

We also treat our car with respect and don't race around like mad rabbits. This allows the natural cooling to stop the drive train from get excessively hot anyway.

Phil
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Reply By: Member - Fab72 (Paradise SA) - Sunday, Jul 28, 2013 at 09:24

Sunday, Jul 28, 2013 at 09:24
Technically speaking, it depends on how hot the diff/trans/gearbox is vs. how cold the water is.
In reality, a cuppa (as said above) is right on the money. The quicker your cuppa cools down, the lower the ambient tempeture and hence the quicker your running gear will cool down.
There is lots of logical sense behind the cuppa rule.

Fab.
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Follow Up By: Member - Fab72 (Paradise SA) - Sunday, Jul 28, 2013 at 09:25

Sunday, Jul 28, 2013 at 09:25
Please don't ask about white vs. black tea ....... hehe
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Reply By: Batt's - Sunday, Jul 28, 2013 at 16:27

Sunday, Jul 28, 2013 at 16:27
Never had trouble with trans or diff in warm or icy cold water your brake disc would be more of a concern if you've been using them a lot before crossing.
AnswerID: 515491

Follow Up By: CSeaJay - Monday, Jul 29, 2013 at 16:05

Monday, Jul 29, 2013 at 16:05
+1
Never had diff ingress problems with breathers extended,
But I did buckle a disk giving me uneven breaking. I guess I underestimated the strain on the breaks, when towing, stopping for the water crossing, best to give it a few minutes
CJ
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Follow Up By: Batt's - Monday, Jul 29, 2013 at 20:54

Monday, Jul 29, 2013 at 20:54
I buckled the discs on a TD5 disco at Ivanhoe crossing should have expected that from a rover. I usually start slowing down early for crossings I know are there that's where diesels engine braking helps you don't need to brake much.
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