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Gearbox Pressure Build Up?

joeyta22
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joeyta22 Enthusiast

joeyta22

Posted
Posted

Hey guys,

Have a bit of an interesting one....

The oil from my gearbox keeps spewing out from the breather line which ends up near the top of the bellhousing. Bought the car with fresh shockprook oil put in and thought it must have been overfilled so i wiped away the excess, checked the oil level (just below the filler hole) and didnt take too much notice of it since. Now (2 weeks later since being wiped away) i had a look underneath the car and it's still spewing out. I've checked the oil level and its about 10mm below the filler hole, so its not overfilled.

Is there a small breather, like on a diff, on the gearbox that might be blocked causing excess pressure?

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https://www.sau.com.au/forums/topic/376791-gearbox-pressure-build-up/
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The Dan Grand Master

The Dan

Posted
Posted

Hey guys,

Have a bit of an interesting one....

The oil from my gearbox keeps spewing out from the breather line which ends up near the top of the bellhousing. Bought the car with fresh shockprook oil put in and thought it must have been overfilled so i wiped away the excess, checked the oil level (just below the filler hole) and didnt take too much notice of it since. Now (2 weeks later since being wiped away) i had a look underneath the car and it's still spewing out. I've checked the oil level and its about 10mm below the filler hole, so its not overfilled.

Is there a small breather, like on a diff, on the gearbox that might be blocked causing excess pressure?

Change the shockproof for something else. We had the same problem in both our race cars and a couple of customers cars that shockproof went into.

Duncan Grand Master

Duncan

Posted
Posted

Yes, I have had the same issue with the race car....it continually breathes smurf blood

I read maybe 12 months back, there was a bad batch of shockproof. I've been running shockproof lightweight for 2 or more years and it's never spat a drop out the breathers

Interesting....I bought mine about 12 months back, and from a very dodgy shop. Got any more info?

joeyta22 Enthusiast

joeyta22

Posted
  • Author
Posted (edited)

Yes, I have had the same issue with the race car....it continually breathes smurf blood

Interesting....I bought mine about 12 months back, and from a very dodgy shop. Got any more info?

Lol, had a fix to the issue in the race car?

I'll give it one more chance and i'll check back on it in a couple of days, if its still spewing it out i'll change to something different. Just seems hard to beleive about the supposed "bad batch", no offense moodles.

The gearbox seems to select all gears fine, the only sounds i can hear from it are when downshifting into neutral to a stop i can hear the gears/synchro whirring back down to the same speed (not a bad whirring).

Edited by joeyta22
Duncan Grand Master

Duncan

Posted
Posted

sure....I put a breather/catch can up near the brake master cylinder...and refill the box after each race meet.....and degrease under the car often....and park it over an oil catch tray.

fixed easy!

  • 2 weeks later...
Burgz32 Community Regular

Burgz32

Posted
Posted

the problem with SHOCKPROOF oil is that about 12-18 month's ago, they discovered that the main ingredient

that made it as good as what it was, was carcinogenic so they had to remove said ingredient and replace

it with something else, and it's never been the same since...

central coast person Proficient

central coast person

Posted
Posted

I also have this problem at the moment and the bell houseing gets caked in oil after just 1 week of driving and its been doing it for the 5000km (1 year) its been in there.

I think lightweight shock proof is not worth anything anymore because i saw a track evo the other week use it and after 1 day it came out black?????????

What the point if it cant stay in the box or if it can it just goes black with heat stress...........changing to AMSOIL SEVERE GEAR Synthetic Extreme Pressure next service.

joeyta22 Enthusiast

joeyta22

Posted
  • Author
Posted (edited)

how much $ was this? im assuming 3 litres

I get all my oil through Harold at performancelub as linked above, awesome to deal with, prices are good and sends stuff out very quickly. Mine took about 4.2L with a little bit of spillage.

Yeah give it a shot central coast person, sound like you have the same problem as i did.

Come to think about it ive been having problems with the gearbox in my 180 drift-pig spewing out shockproof aswell (havnt driven it in about a month), i always just thought i had a leak around the top of the case. Hmmm im sensing a common theme here...

Edited by joeyta22
The Dan Grand Master

The Dan

Posted
Posted

The GTR/GTST 25 boxes should take about 3.6-3.8L

And don't tell me that you put 3L in your mates mates car and it was full. Drive the car around the block and check it again.

Most of the R200 rear diffs will take 1.6-1.7L front diffs in the GTR about the same but closer to 1.5

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