Outer Limits 4x4 Board

hey fellas.

one of the first things i will be doing once my 75 is back from its roady, and all signed off from vic roads, is to runn all the breathers i need to.

both diffs arent an issue as i have done that before.

what is the issue is the gearbox and transfer case, one of they guys i do night school with who is a mechanic, told me that the toyotas have a brass breather on top of the gear box, and possibly another one on the transfer, can any one give me more info??

his advice(he has been a 4wder in the past too) was to find where the breather is and witness mark the floor and then drill down from the top, put a barb in it and run my lines from that. then put a gromet back in the floor. i would like to avoid putting an extra hole water can get through into my floor, so what is the recomended path? drop gearbox cross member and undo breather buy hand??

also fuel, should i extend that breather??



i want to make sure anything that could suck in water, cant, as i had two diffs blow, one that took the gearbox and transfer case with it, in my last 4wd, so i dont want to do that again....


cheers guys

Alistair

also how when running a stainless snorkle, do most people pre filter the air, if at all???

how important are running breathers?? i have a 95 hilux and like deep water and mud.. potential for a disaster? cheers

HTH wrote:how important are running breathers?? i have a 95 hilux and like deep water and mud.. potential for a disaster? cheers

yep, big time

scuba steve 22 wrote:

HTH wrote:how important are running breathers?? i have a 95 hilux and like deep water and mud.. potential for a disaster? cheers

yep, big time

yes but even with breathers you can still get water in so check it periodically to see if its milky or nice and grey / black oil colour.

Very Important .
Depends on what box you have, Run your hands around the top of the gearbox most likely around the gearstick.
My Bundy had a nipple type like on the diff ,Had to break it off get a bit of tubing bend it tap it in the hole and silicone it in.
My Transfer dosent seem to have one so ill have to get one engineered.
My Front diff and gearbox runs to the engine bay with two petrol filters
My rear diff goes up into the back door through another petrol filter

Wambat wrote:also how when running a stainless snorkle, do most people pre filter the air, if at all???

I run a Donaldson Topspin on top of mine, no socks or foam to fall apart and go through the engine

sweet, thanks fellas, this will be one of the first things i tackle once the roady is done.

and HTH - it is very important, i ran diff breathers on my 60 series land cruiser, on the front i didnt fit the standard breather filter (left it with nothing) just left in the engine bay, and never blew a diff, but the read i put the standard breather filter on, and it is a check valve, so it only alowed air to escape, not return in, and so when in a bog hole it sucked in water through the seals, and hey presto, sized diff. torn transfer teeth, and a gear box rebuild to boot (brand new diff transfer and gearbox) total cost for that fuck up 5 gs.

The best way to go about it is to take out your original breather and head down to your local auto shop and get a hose fitting with the same thread. then simply screw it in and run your hose off that. It will seal better and last longer and fit standard size hose. Then at the other end put a $5 fuel filter to keep the dust and crap out. Blow down it occasionally to check for blockages and your set.

Dont run it into your cab! Diff/transmission oil stinks! Even from your front diff when its not engaged! I ran it through a hole in the firewall to test for a week and it was BAD! run it up to the top of your firewall

Best solution to this problem is not to drive through bogholes- its bad for everything and will cause you a lot of other expenses (and is so uncool). Water is often unavoidable and it is good to prepare your car but if you can - go around it.

i like driving muddy boggy areas, so its gunna happen.

the diffs aren't the main problem i have run them previously on another vehicle, it is the gearbox and transfer that i am mainly intrested in figuring out.


also just as a side question, i can get hydraulic hose cheep, iv i used 1/4 inch hose, as it is stronger(less chance of kinking) than most fuel hoses, think that could be a go?? other wise i will do what i done last time, just run fuel hose, and will just be running it up into the tray, will make a box for them to sit in up out of the way.

Al

You really can use any hose you like. As there is no pressure or fluid or heat running through them it really doesnt matter. You could even use garden hose if you wanted - its cheap, strong, standard size.

Same principles apply to diffs as for transmissions/transfers so if you can do one, all you have to do is locate the breather on the other.

that is where the problem lies, the location of the gearbox and transfer breather.

Not sure if the 75 series is exactly the same but check out the diagrams for the 80 series here;

http://www.lcool.org/technical/80_series/breathers.html

I put cheap fuel filters on the end of my breathers. I know of a few others who do it too, will stop any crap being sucked back into diff, gbox etc.

Also make sure the rubber boot around the shifter (the one on top of the box, not in the cabin) is in good condition, otherwise water can get in there too. and axle seals, gbox input + output seals etc.

In my sierra the shifter boot actually has the breather in it. It just has a moulded tube with a hole in it. Dunno if yours may be the same if you cant find any other breather??

Also, as has already been mentioned. Check oils regularly. If i have been through deep water, within a week i will open all filler plugs and make sure level is correct and that it isnt milky.