091 transmission Nosecone vent hole fluid leak

[klondike97009]

I have a 6 rib 091 that leaks fluid out of the nosecone vent hole. About 30 seconds after to put it into gear the tranny starts pump fluid out the vent hole. I have drained and refilled it with 2 1/2 quarts 80-90w gear lube, so I know it is not overfull. I have also removed the nosecone and replaced the gasket. It still leaks fluid out the vent hole.
Any input on why this is happining will be greatly appriciated. Thanks!!

[Karl]

I see you did not get a good answer the last time you asked

http://www.thesamba.com/vw/forum/viewtopic.php?t=286498&highlight=nosecone+leak


Tell me more about this "80-90w gear lube" you put in. GL-4, GL-5, dino oil, or synthetic?

[klondike97009]

I put in 80-90W GL 5 MT-1 and I have read that thread several times, it just does not seem to answer my question. The only answer I got is overfull. I pulled the drain plug and let it sit overnight, wasnt even dripping when I went back. I filled it up to where it just started running out the fill hole. Only took 2 1/2 qts.
Thanks for your reply

[busnerd]

Did you jack the bus up on the left side when you filled the tranny? Last time I topped up my transmission I did that, which led to it being overfilled a bit. After a highway run it burped up some fluid out of the breather but hasn't done it again since. I say let it be for a couple of days (assuming you drive it regularly) and check later to see if it is still leaking. I bet it stops.
good luck
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Clarke B.
samba member # 3245
'78 Westfalia Dakota Beige
'64 Camper

[Karl]

I had that happen to me when I used Redline synthetic oil. It expanded when it got hot.

I drained it out and put in the CORRECT GL-4 gear oil and it stopped doing it.

GL-5 with or without the bogus MT-1 is the wrong oil for a VW transaxle.

Look here, top right corner, group 34:

GL-5 has been discussed before. You might want to read this thread:
http://www.thesamba.com/vw/forum/viewtopic.php?t=283786&highlight=gear+oil

"Glenn wrote:
Use any name brand 80W-90 and GL-5 is perfectly safe to use.

If you want to debate... do it here GL 4 or GL 5

And remember to remove the fill plug before draining it. "



Here we go again...... FACTS vs bullsh!t:

GL-4 and GL-5 are specifications of the gear oil. They have NOT changed in the past 50+ friggin years. GL-4 is GL-4 is GL-4 and will always be spec'd GL-4. Just like SAE 30 weight oil. That is the spec.

The difference between GL-4 and GL-5 are the additives to make it meet the gear oil spec it is named for.

VW took the cheap way out when they built the transaxles and used the cheaper bronze syncros. THAT is why they specify GL-4 gear oil. GL-5 eats bronze. But not brass syncros. Porsche uses brass, VW does not.

Now you may say GL-5 with MT1 or some-such BS is OK but that is mumbo jumbo. I do not know where that fairy tale came from. MT-1 denotes intended for NON-SYNCRONIZED manual transmissions!!
This comes right from Amsoil: http://www.syntheticwarehouse.com/brochures/TSB_AP..._Lubes.pdf

From the same page above READ what GL-4 is for: These oils may be used in selected manual transmissions and transaxle applications where MT-1 lubricants are unsuitable. [remember, VW bus transaxles are syncronized]

Now read about GL-5: intended for gear in axles. NO where does it say transaxles or transmissions.

Go to any parts store and look at the back of any bottle of GL-5 gear oil.
It will say something like "a multipurpose gear oil that exceed the latest requirements of gear and transmission manufacturers’ requiring API GL-5 or API MT-1 level lubricants." The KEY words in that sentence is "transmission manufacturers’ requiring API GL-5". VW as the manufacturer, requires GL-4. How f'ing hard is that to understand??

Here is a data sheet for GL5 with MT1; READ the last line on the left side:
http://www.sinclairoil.com/product_data_sheets/HD%20Gear%20Oils.pdf

Can't read and comprehend? Here is what it says:
"Recommended for use in automobiles, light duty and heavy duty trucks, tractors, and industrial gear systems THAT CALL FOR extreme pressure lubricants meeting the API GL-5 or MT-1 specification."

Guess what, no matter what Glenn says, VW never specified GL-4 in the transaxle. Cut and dried. Yes, GL-5 is spec'd for the final drive section of the auto transaxle but NOT the manual transaxle.

Here is the 77 bus info sheet: http://www.baywindowbus.com/77infocard.jpg
READ the top right corner, group 34.

Read what I wrote here a long time ago: http://www.type2.com/library/drivetra/gl4oil.htm

"People, manufacturers RECOMMEND specifications for a reason. Lots of time and research went into it. Not just because one or two people used something else NOT recommended and did not have a problem. Just because Porsche says Swepco is OK in their trans does not mean it is OK in a VW trans. Two TOTALLY different transmissions, internally."

[Wildthings]

The books says it takes 3.7 and you put in 2.5. That tells me that something isn't draining correctly. Don't know 091s very well, but maybe there is a drain hole between the tranny and differential section that are supposed to allow the oil to return to the sump. Could be the drain is clogged causing the front of the box to run overfilled.

[incynr8]

man I miss that gl-4 smell.....
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