Jump to content
SAU Community

Recommended Posts

94 R33 GTSt 5spd Manual. Just changed the gear oil with 3.5 liters of Redline Lightweight Shockproof (smurf blood). Shifts fine. After driving for approx 200 kilometers, I started smelling gear oil. I looked under the car and the tranny was covered with the smurf blood. I tracked down the source to the TOP FRONT of the tranny. There is a small metal tube that begins down near the end/bottom of the tranny and runs along the top and ends in the front. This tube is "dumping" out the smurfs blood.

post-47865-1221791198_thumb.jpg

I cleaned the transmission fully. Took the car out for a test drive throughout some low speed roads. No leak. I then took the car on the freeway at 120kph for a solid 20 minutes. I started smelling the gear oil again. The "vent tube" is dumping out the smurfs blood again.

ANY IDEAS? HAS ANYONE EXPERIENCED THIS BEFORE?

The tranny shifts fine. I didn't overfill; as soon as it began dripping out of the filler plug I stopped. The car was on 4 jack stands - level. HELP as I run this car on tracks here in the US and have an event coming up on 4 October 2008.

I'm thinking of going with Mobil 1 75W-90 as I "believe" the Redline (which acts like a 75W-140) may be too much and causing too much pressure and relieving it through the vent tube? THOUGHTS?

www.cardomain.com/ride/835297

Edited by WidnerR33GTSt

for some reason the transmission is building up pressure inside the box when it gets hot or you over filled it lol

or the hose is crimped/blocked causing pressure to biuld up then shoot out oil, check the beather/line to see if its blocked or restricted in anyway,

gl with it, have seen this before and its usally a breather problem, or to much oil

Will it stop when the oil level is correct?

I've seen some recommend 2.5 liters and others 3.5 liters. I filled it until it was dripping out of the filler.

What does gl with it mean? Sorry...don't understand that.

Its normal.

Some boxes just breath a little.

Extend the breather hose a bit, thats how mine is done and doesnt leak

I recently found out one car i know of runs a mini catch can :)

It runs an after market gearset, and its apparently been seen to occur before, not all that common but happens :)

THANKS...appreciate the answer. I was "thinking" the same...just want to make sure.

So is it due to the 75W-140 characteristics of the Redline Shockproof Lightweight gear oil? I used to have Mobil 1 75W-90 in it...and it never (in 4 years) breathed.

Should I have a lower level of Lightweight Shockproof oil in it than I would using "normal" oil?

Will it stop when the level gets down to a certain point?

It will stop, you've 99% overfilled it and when giving it a little shit, the pressure builds up and leaks out of the breathers. Drain a bit or let it leak it out till it settles. Eitherway your not damaging anything.

Thanks guys. I just ran the "dog" out of it on the freeway (140kmph) for a good 20 minutes...it leaked a little more. I'm going to put it up on 4 jack stands and check the level. I'll let you know how it turns out.

www.cardomain.com/ride/835297

Checked the level. It is fine. It is just below the lip of the filler plug.

I guess when you use the Redline Lightweight Shockproof you use less than other oils? I'm going to run her hard tomorrow on the freeway and see if it "breathes" out anymore.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Have a look at that (shitty) pic I posted. You can see AN -4 braided line coming to a -4 to 1/8 BSPT adapter, into a 1/8 BSPT T piece. The Haltech pressure sender is screwed into the long arm of the sender and factory sender (pre your pic) into the T side. You can also see the cable tie holding the whole contraption in place. Is it better than mounting the sender direct to your engine fitting......yes because it removes that vibration as the engine revs out 50 times every lap and that factory sender is pretty big. Is it necessary for you......well I've got no idea, I just don't like something important failing twice so over-engineer it to the moon!
    • Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
    • How do you propose I cable tie this: To something securely? Is it really just a case of finding a couple of holes and ziptying it there so it never goes flying or starts dangling around, more or less? Then run a 1/8 BSP Female to [hose adapter of choice?/AN?] and then the opposing fitting at the bush-into-oil-block end? being the hose-into-realistically likely a 1/8 BSPT male) Is this going to provide any real benefit over using a stainless/steel 1/4 to 1/8 BSPT reducing bush? I am making the assumption the OEM sender is BSPT not BSPP/BSP
    • I fashioned a ramp out of a couple of pieces of 140x35 lumber, to get the bumper up slightly, and then one of these is what I use
    • I wouldn't worry about dissimilar metal corrosion, should you just buy/make a steel replacement. There will be thread tape and sealant compound between the metals. The few little spots where they touch each other will be deep inside the joint, unable to get wet. And the alloy block is much much larger than a small steel fitting, so there is plenty of "sacrificial" capacity there. Any bush you put in there will be dissimilar anyway. Either steel or brass. Maybe stainless. All of them are different to the other parts in the chain. But what I said above still applies.
×
×
  • Create New...