Pressurising against water ingress

[Leithfield]

Have found the extended diff breathers to be only partially sucessful on my modded Surf (4-Runner). With repeated water work, am contemplating pressurising my diffs, bellhousing, etc as a solution. Seached for any applicable threads; however, no joy.

Does anyone have any experience of such a system, or can direct to an online resource. What pressure should I run so as to prevent water entry, but not blow seals?
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Leithfield

[marin]

ive just started thinking about this as well, my problem being my dizzy cap, i have been told all you need is something like 4 psi, just enough to positive pressure, but not enough to explode dizzy caps or push oil out through seals or blow out seals completely. Cauz i'm looking at only doing my dizzy for now (until i get around to some endless air) i'm looking at using my air horn pump. Can anybody tell me how long i could possibly run an airhorn pump for (its a quality bosch pump, not an el cheapo) without stuffing it? like could it keep pumping for ten minutes if i got stuck and needed to be pulled out of water/mud, or would it only be a really short term thing, like on and off again within a minute or 2 when exit the water/mud or get stuck and turn it off?

[Fatpaj]

In regards to running your air horn pump, the pump side of things will run for days but it is the motor that will fail as it is a DC with brushes and no cooling fan it will overheat as a rule 5 minutes would be max allow to cool and then start again cooling time could be upto 2 hours. why not use silastic to seal the cap to the base and the spray the outside of the cap with a rubber type paint to stop any moisture from soaking through and last of all silicon the leads on the posts
Have fun

[p76rangie]

Why not try a 12 volt pump for inflating air beds.

[grazza]

You can get a spray paint called PlastiCote (or something) which is a liquid plastic spray. This could be good stuff for sealing.
When I get home I will get details of the can.

[hottiemonster]

You can get a spray paint called PlastiCote (or something) which is a liquid plastic spray. This could be good stuff for sealing.
When I get home I will get details of the can.

are you home yet?

i was going to pressurise my dizzy but my mate showed me something he did on his 60 series cruiser, basically silicone the dizzy base and cap together.

after doing this i can now pour a litre bucket of water on my dizzy without problem and the car doesnt even mis a beat.

from 4wding in gemmy/labourtouche on tuesday just gone, water is still getting in somewhere resulting in the car stalling and not wanting to start.

i have covered my coil to try for this weekend and i will spray heaps of wd40 over everything.

my conclusion is that my problem is not coming from the dizzy but somewhere else.

anyway, ill try the bog hole possibly on vic range to see what gives and hopefully dont fill my car up with water from it konking out.

[Mudzuki]

With the rain that we have had lately, it will be bloody deep!

[DaveS3]

Why not try a 12 volt pump for inflating air beds.

Depending on the brand - some will have cooling problems, others no. I have to use them all the time at work and have found some better than others, just choos carefull and test them at a shop befoe you buy to see if they gat hot.

Dave.

[dow50r]

Gday
Best way is to remove the one way valve on the diff or box and throw away. they are 99% the cause of water getting in as the axle cools in the water and because the valve wont let air in, water is sucked past the axle seals instead.
Best way to pressurise diffs is to run a pressure regulator set to 2 psi for them. Thats what pressure the valve you just removed made when the diff was hot.
You can run this pressure into a fire extinguisher as a receiver from the pump (arb, thomas, b/t, etc) and use it to pressurise clutch, dizzi, diffs, whatever. A gas solenoid will switch flow on and off to these and the regulator valve will take care of pressure
Andrew

[Carl Coight]

Gday
Best way is to remove the one way valve on the diff or box and throw away. they are 99% the cause of water getting in as the axle cools in the water and because the valve wont let air in, water is sucked past the axle seals instead.
Best way to pressurise diffs is to run a pressure regulator set to 2 psi for them. Thats what pressure the valve you just removed made when the diff was hot.
You can run this pressure into a fire extinguisher as a receiver from the pump (arb, thomas, b/t, etc) and use it to pressurise clutch, dizzi, diffs, whatever. A gas solenoid will switch flow on and off to these and the regulator valve will take care of pressure
Andrew

I have done the same thing on a couple of cars.
The gas solinoid is a good idea for on/off i'll try that.

[hottiemonster]

after putting a plastic bag around the coil and siliconed the dizzy, i have no troubles on the weekend with water. although i stuffed my car early saturday morning, i was going through forms of water which i would have had problems with before. i think i have found a winner.

although i didnt get to test vic range, after i get my car fixed, i wanna head back there again soon to test it out.

i hear through vic range is very deep, even the chicken track, but some people might consider very deep different. i am only going off what i hear.