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PIOTREK

Gear Box Breather

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PIOTREK    0

about 3000km ago i recently changed the gearbox oil to redline lightweight shock proof (smurfs blood) in my r33 turbz. i started to get a bit of fluid coming out of the breather valve, i'm pretty sure. so i ran a rubber hose to the top of the engine bay. its been a while and i'm still getting a little bit of fluid coming out of the hose and onto the engine bay.

the bolt on the side of the gear box has been taken off, and got the correct amount of oil in it. and nothing extra came out of the breather valve.

approx close to the full bottle of fluid went in, about 3.5L i think and was poured in through the shifter inlet, inside the car.

Now anyone got a simular problem? any advice.

i want to place the rubber hose somewhere else as i'm stick of taking the oil off the engine :P

however i'm trying to work out if everything is normal.

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ActionDan    625

Hmm, when I did a fluid swap with the lightweight-shockproof I had no leakages that I knew off. Maybe you over filled it? Though I recall using a full us gallon plus a touch extra to get mine to the filler hole (I filled through this with a pump bottle). I did let mine drain overnight though.

It should only leak if it's got too much I'd of thought but I'm not an expert. We're talking a 5-spd manual right?

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PIOTREK    0
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  • Hmm, when I did a fluid swap with the lightweight-shockproof I had no leakages that I knew off. Maybe you over filled it? Though I recall using a full us gallon plus a touch extra to get mine to the filler hole (I filled through this with a pump bottle). I did let mine drain overnight though.

    It should only leak if it's got too much I'd of thought but I'm not an expert. We're talking a 5-spd manual right?

    yer its the 5 speed turbo, NOT A GTR or auto

    is it ok to fill it via the shifter? because i was reading that gtr can't because of the transfercase, is that right?

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    ActionDan    625

    I know it's fine to fill through the shifter in the GTsT but I'm not sure about the GT-R as I didn't have to swap mine when I had the GT-R, I only did it in my GTsT.

    Only thing I could think of would be overfilling but if you said you'd checked the filler hole and it was fine yeah?

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    Beer Baron    27

    open up the filler plug and see if anything comes out. if oil comes out, you over filled it. from time to time they will throw out oil during hard driving, usually only happens on the track though. you can lengthen the breather, or other solution i've seen on track cars is to make a little expansion tank at the end of the breather. so the breather feeds into a vented tank which then allows the oil to drain back down into the box. but on a road car you shouldn't be having the problem. the other less happy answer is that something is wrong with the box, but it's more commonly just too much oil.

    yes GTR cannot be filled via the shifter hole as the GTRs shifter goes into the transfer case, not into the gearbox. GTS4 is the same. GTST is fine to fill through the shifter hole, but personally i find it easier and less chance of overfilling and less chance of mess to just fill it through the filler plug as it's meant to be. :domokun:

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    ActionDan    625

    Mine took a whole gallon bottle and then a bit more using a pump bottle and the filler hole.

    I let mine drain overnight.

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    PIOTREK    0
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  • anyone can tell me at least how much oil they put in?

    is it worth installing a catch can?

    any ideas or suggestions?

    it only happens after hard core thrashing!!!

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    PIOTREK    0
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  • K thanks, however has anyone had a similar problem? Cause I'm considering putting in another type of fluid but the box itself feels really good using the light weight shockproof RedLine stuff. Not sure but is there an simple explanation? Some tell me to only pour 3L in! Anyone no wat Nissan reccomend?

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    PIOTREK    0
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  • Mine took a whole gallon bottle and then a bit more using a pump bottle and the filler hole.

    I let mine drain overnight.

    Boys i gotta say a simple question like how much oil in your 5speed and only 1 response (2 in thread)

    Thanks action dan :blush:

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    PIOTREK    0
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  • I done my research and ran an extended line into the engine bay. I no that the gear box need to breath, so will it be ok if it's under the engine bay?

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    your only spose to fill it up to the filler hole on the side of the gear box, if you must fill it throught the shifter then have the filler hole open and when it starts comming out of that hole then it full,

    if i was at home id look up the specs in a workshop manual for you but im not home for a few weeks

    Edited by s13_Skyline_inside

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    V28VX37    255

    I'm having the same problem.

    I had a look under the car after a long country drive to find a fair bit of blue gearbox oil at the rear of the gearbox and on the crossmember:

    14745387030_60ffa9ae6f.jpg

    The car's also recently been on the dyno so it may be from that too. It's an R34 GTT with R34 RB25DET gearbox and Redline Lightweight Shockproof.

    I had a better look today and it's definitely coming from the breather:

    14745485537_9e1f49151e.jpg

    Is there meant to be a hose connected to the breather? If so, where does it connect to? This is a recent conversion so maybe this is something that's been missed in the install...

    I was just trying undo the driver side 1/2" plug (refer right arrow below) on a level surface to check the oil level, can't get enough leverage, is there a good trick to this?

    14909055526_86d17e1463.jpg

    Thanks!!

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    V28VX37    255

    Got the filler plug open yay. There's still oil in there but I'd estimate the level to be 2-3 mm down from the edge of the filler hole. Photo below though it's a bit hard to see.

    How much oil do you reckon I need to fill it up to full? And how do I fix the breather hose so this doesn't happen again??

    Cheers

    14931828682_64163a0a69.jpg

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    V28VX37    255

    Found some photos of RB25 boxes looks like the breather runs into a little hook near the bellhousing? I hope this is not a gearbox out job :/

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    GTSBoy    1,066

    Yes, breather runs up to there. Someone with small hands might be able to fit it up as per original, but it doesn't have to go there. Just get a long bit of hose and run it up behind the engine and fasten it to some convenient point.

    FWIW, my breather hose runs up to the normal spot and I still get the shockproof foaming up and bleeding out of it. It does it when the car gets a flogging. So I am going to (one of these days) extend my breather hose up higher anyway.

    Edited by GTSBoy

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    sky30    21

    I had the same issue, i put a common clear plastic fuel filter ( for a carby engine) in the middle of the breather hose and ran the end to up behind the head (as per factory). This fixed the problem, the fuel filter acts as a oil/ air separator, and only cost a few $.

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    V28VX37    255

    Yes, breather runs up to there. Someone with small hands might be able to fit it up as per original, but it doesn't have to go there. Just get a long bit of hose and run it up behind the engine and fasten it to some convenient point.

    Cool I'll do that. I assume I can use any old auto hose for this?

    I had the same issue, i put a common clear plastic fuel filter ( for a carby engine) in the middle of the breather hose and ran the end to up behind the head (as per factory). This fixed the problem, the fuel filter acts as a oil/ air separator, and only cost a few $.

    Great idea! Do you mean one of these:

    EMPI-VWFuelFilter.jpg

    Silly question, which way around should this go?

    ...

    Also another thing, it looks like my breather connector is bent, it's pointing down not forward (see photo of gearbox above). I'm not too keen to trying to bend it back as it might crack. What this means though is that there will be a bend in the hose and some oil may sit there, will this be a problem?

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    GTSBoy    1,066

    That filter is a little motorbikey one. It'll probably work, but the cheap $2 ones (that look like the original Ryco ones, about 65mm long, maybe 50mm diameter) are probably better. They have more volume inside.

    Fit it so that the outside is connected down to the gearbox. The inside of the filter element should face atmosphere.

    Use low pressure fuel hose for best resistance to oils.

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