Rear diff breather install
- Thread starter ERROR504
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Would the air void in the hose affect the sensitivity of the pressure release valve on the breather? I.E. would the rear differential fluid need to be hotter to increase the air pressure to release the valve?
I don't believe so ....... it's just a steel/alum ball sitting on top of a stem pipe. IF any pressure builds up, the intent is to that pressure to vent while at the same time, when water is splashed on to the vent the ball and cap would prevent ingestion.
Thanks for the clarification.
Still learning. This forum is like a cheat code for noobs like me.
- Oct 15, 2024
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About to install a rear diff breather but I have a question: If other breather valves are already in the engine bay, why does Toyota not also simply put the rear diff breater valve there to start?
IMO...... cost of the material to run from the rear diff into the engine compartment. Except for the small percentage of folks that would actually traverse deep water on a repeated basis, it's just not needed.
Hard to say, all it would have taken was length of hose a few frame rail clamps and axle union.
Maybe the reasoning was the front is more prone to seeing water driven up into the breather at speed if you don't have the steel skids, whereas the rear would mostly see more gentle submerging rather than forced upwards splashing?
But where they placed it (just above drivers side UCA near the front bushing) makes it slightly prone to that very scenario as there is no splash guard blocking fender well ingress to it there, Toyota should have moved it a little higher or further forward IMO to get behind the plastic shield or above the opening in the fender well.
Maybe the reasoning was the front is more prone to seeing water driven up into the breather at speed if you don't have the steel skids, whereas the rear would mostly see more gentle submerging rather than forced upwards splashing?
But where they placed it (just above drivers side UCA near the front bushing) makes it slightly prone to that very scenario as there is no splash guard blocking fender well ingress to it there, Toyota should have moved it a little higher or further forward IMO to get behind the plastic shield or above the opening in the fender well.
- Oct 15, 2024
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Interesting and don’t disagree. But it would be so inexpensive to do from the factory, and as far as I know every 4-wheel Toyota simply leaves it on top of the differential. Kind of like cheaping out on the hood struts. I’ve dunked my rear differential many times unfortunately before I even knew about this issue, which I’m now going to fix asap.
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- #29
it’s been deathly hot out recently. I tried to find away to feed the fuel line from the tail light to the rear differential (just bc it would have been the shortest route). Looks like to set it up here I would have to remove the rear bumper to get better access…which I don’t want to do. Guess the two ideal spots are the gas cap area and engine bay.
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I’ve also seen it installed in the tail light area, but I’m just going to put it in the engine bay.
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- #31
I have only seen videos of it done on the Tacoma. Prolly going to do the same with it on the engine bay, but hold off till end of summer. Just to hot to be crawling under the truck outside.
It is warm outside in the summer but doing the job at 0600/0700 in the morning solves that problem
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- #33
your not wrong and prolly will have to set some time to do it in the morning.It is warm outside in the summer but doing the job at 0600/0700 in the morning solves that problem
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- #34
Can confirm this union part will fit our rear diff. Used a fuel line as well so it should hold up better in the long run.
Does anyone know what the exact thread size of the rear diff breather hole? Is it 1/8 in BSPT?
Looks like you are missing some hose clamps there.
Any updates on your findings?
I'm about to install this kit for my rear dff:
Toyota Off Road Vehicle Differential Breather Extension. KIT-1012
I did I made a new thread. Honestly not worth it headache. Just do the rear diff. The others are high enough.
Diff Breathers
First off, let me say this is probably completely unnecessary for 98% of you. The only one I would urge you to do is the rear, because it’s just a knob coming off the axle. Everybody should do that one. The others I did honestly, nobody should mess with those. It was a total PITA to get to the...
www.landcruiserforum.com
ED Martin Toyota just put up a breather kit from OEM parts:
