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Old 03-09-2022, 05:57 PM   #1
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Manual gearbox breather

I think my gearbox breather might be blocked. Does anyone have experience replacing or cleaning theirs? On the manual not automatic gearbox.
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Old 03-09-2022, 06:30 PM   #2
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I don't believe that the MTs in these have a vent/breather.
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Old 03-09-2022, 06:57 PM   #3
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Manual gearbox breather

There is a breather between the reverse and neutral position switches. It is pressed into the case though and does not look like it is removable through non-destructive means.

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Old 03-10-2022, 08:39 AM   #4
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I think my gearbox breather might be blocked. Does anyone have experience replacing or cleaning theirs? On the manual not automatic gearbox.
Just curious. What symptoms are you having?
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Old 03-10-2022, 09:59 AM   #5
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There is a breather between the reverse and neutral position switches. It is pressed into the case though and does not look like it is removable through non-destructive means.

Ya I looked through the service manuals and they don't even show it as existing much less have a repair/replacement procedure for it.
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Old 03-10-2022, 12:03 PM   #6
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Ya I looked through the service manuals and they don't even show it as existing much less have a repair/replacement procedure for it.
Makes sense as it looks for sure non serviceable. The main body is pressed in and the cap is crimped at the base. It feels like there is a spring in there that keeps the cap up. You may be able to pry the cap off and re-crimp it but

OP, I'd gently blow air into the fill hole in a non-sexual manor and see if you can feel air venting around the cap.
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Old 03-10-2022, 12:54 PM   #7
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If you pull that sensor out could you see where the inside of the vent is with a bore scope? Another option would be to blow smoke from a smoke machine into the fill whole. It would be slightly less erotic than what @NoHaveMSG described.
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Old 03-14-2022, 04:23 PM   #8
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I think my gearbox breather might be blocked. Does anyone have experience replacing or cleaning theirs? On the manual not automatic gearbox.
Curious about the symptoms. Is it leaking fluid out either end?
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Old 03-14-2022, 06:10 PM   #9
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Not 100% sure but do not think it is a breather. I believe it is a over/under pressure valve. Not vented to atmosphere but there to relieve pressure if needed.
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Old 03-14-2022, 06:29 PM   #10
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Not 100% sure but do not think it is a breather. I believe it is a over/under pressure valve. Not vented to atmosphere but there to relieve pressure if needed.
It's for sure a breather. Without it we would be losing seals. You can move it open/closed with very little effort. There is one just like it on the diff too. Gravity basically holds in closed and any positive pressure due to heat won't need much force to open it.
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Old 03-14-2022, 10:31 PM   #11
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Quote:
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Just curious. What symptoms are you having?
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Originally Posted by Ultramaroon View Post
Curious about the symptoms. Is it leaking fluid out either end?
The rear seal is leaking even after installing a new oem seal. The yoke has no significant wear, just a little polished. I seem to remember there being some vacuum when I last undid the refill bolt also. It may be something more serious but the breather seemed like an easier place to start.

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Makes sense as it looks for sure non serviceable. The main body is pressed in and the cap is crimped at the base. It feels like there is a spring in there that keeps the cap up. You may be able to pry the cap off and re-crimp it but
If its not replaceable I will look at doing that.

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OP, I'd gently blow air into the fill hole in a non-sexual manor and see if you can feel air venting around the cap.
Firstly... How I treat my gearbox is between me an the box... This is not the place for kink shaming..

Secondly this is not a bad idea also.
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Old 03-15-2022, 12:08 PM   #12
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The breather is a check valve. The spring is between the cap and a ball. As observed at ambient temp, the transmission should maintain a slight vacuum.
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