Notices
Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...
Sponsored by:
Sponsored by: 949 Racing

Leaking 6 Speed

Thread Tools
 
Search this Thread
 
Old Jul 24, 2010 | 11:33 AM
  #1  
dstn2bdoa's Avatar
Thread Starter
Senior Member
iTrader: (18)
 
Joined: May 2008
Posts: 988
Total Cats: 8
From: Big Bear Ca
Default Leaking 6 Speed

I recently picked up an 01 se to use for parts. The 6 speed has some leakage from the union near the rear of the tranny. Not the section where the bell housing meets the trans, the next one back. Could this be as simple as loosening the two sections a bit, cleaning it up and rtv'ing it? Or do I have big problems?

The car had a front end collision, shifter seems to row through the gears ok.

Name:  IMG_2211.jpg
Views: 1530
Size:  93.1 KB



Name:  IMG_2213.jpg
Views: 1262
Size:  95.0 KB
Old Jul 24, 2010 | 12:48 PM
  #2  
Doppelgänger's Avatar
Elite Member
iTrader: (12)
 
Joined: Sep 2007
Posts: 6,850
Total Cats: 71
From: Charlotte, NC
Default

Clean it up really good and verify location of leak.

Report back.
Old Jul 24, 2010 | 12:51 PM
  #3  
fooger03's Avatar
Elite Member
iTrader: (2)
 
Joined: Jan 2009
Posts: 4,149
Total Cats: 230
From: Columbus, OH
Default

make sure it's not leaking from one of the sensor locations. I had to replace the sensor on the passenger's side when i got my 6-spd
Old Jul 24, 2010 | 02:11 PM
  #4  
dstn2bdoa's Avatar
Thread Starter
Senior Member
iTrader: (18)
 
Joined: May 2008
Posts: 988
Total Cats: 8
From: Big Bear Ca
Default

I wiped it down when I pulled it out. I will be back home on Monday, I'll get a better location then. It really seemed to be coming from the seam in between the two sections.
Old Jul 24, 2010 | 04:08 PM
  #5  
miatauser884's Avatar
Elite Member
iTrader: (11)
 
Joined: Feb 2009
Posts: 2,959
Total Cats: 11
Default

If it is leaking there, then I believe you are f***ed. If it were the tail house you would be ok. You cant get the midsection separated without removing 6th gear. It requires a puller, but it's not that hard to get off and put back on. Then you could get a small amount of room to run a bead of silicone in the section that you describe. Honestly, since it is already out of the car, I'd pay to have someone do it. Probably $100 to $150.
Old Sep 23, 2015 | 03:55 PM
  #6  
patsmx5's Avatar
Elite Member
iTrader: (16)
 
Joined: Aug 2007
Posts: 9,405
Total Cats: 558
From: Houston, TX
Default

Bump!

I have the same exact leak in the same exact spot. I've cleaned the area and I'm 99% sure it's leaking between the tail shaft housing and the middle housing where the two meet up.

Question: How do I fix this? Does the transmission fall apart if I pull that rear housing off? Any special tools to thing I need to know to fix this? To fix the leak I just need to get the housing off, clean it, RTV and reinstall. I just don't know what happens when I remove the bolts and start pulling the housing off.
Old Sep 23, 2015 | 04:22 PM
  #7  
aidandj's Avatar
SADFab Destructive Testing Engineer
iTrader: (5)
 
Joined: Apr 2014
Posts: 18,643
Total Cats: 1,870
From: Beaverton, USA
Default

<p>Here's a guide I put together on how to replace the tailshaft housing.</p>
Old Sep 23, 2015 | 04:34 PM
  #8  
patsmx5's Avatar
Elite Member
iTrader: (16)
 
Joined: Aug 2007
Posts: 9,405
Total Cats: 558
From: Houston, TX
Default

Originally Posted by aidandj
<p>Here's a guide I put together on how to replace the tailshaft housing.</p>
Damn I searched and didn't find that, but I had "leak" in my description.

Very impressive, and thank you for posting that write up. That's good stuff!

Couple questions for you if you don't mind.

Since I only need to remove the housing to reseal it, would I need to remove the transmission from the car? Or would some of those parts inside slide back and fall off without the transmission tail end point up?
Old Sep 23, 2015 | 04:35 PM
  #9  
aidandj's Avatar
SADFab Destructive Testing Engineer
iTrader: (5)
 
Joined: Apr 2014
Posts: 18,643
Total Cats: 1,870
From: Beaverton, USA
Default

<p>I think that you could do it with the trans still in the car. But it wouldn't be easy. There were a lot of little fidgity things that were way easier with the trans out of the car instead of on my back with the car on jackstands.</p>
Old Sep 23, 2015 | 06:57 PM
  #10  
bbundy's Avatar
Elite Member
 
Joined: Jul 2005
Posts: 2,502
Total Cats: 146
From: Anacortes, WA
Default

Ive been through a lot of 6 speeds. the OEM selant is garbage. at least half of the ones I have seen leak where the housing is bolted together that same spot.

I have not had any of them that I took apart and re-sealed with Prmatex "Right Stuff" leak.

FWIW the leak is usually not as bad as it seams. it will weep like that for years befor the fluid level drops noticably.
Old Sep 23, 2015 | 06:59 PM
  #11  
aidandj's Avatar
SADFab Destructive Testing Engineer
iTrader: (5)
 
Joined: Apr 2014
Posts: 18,643
Total Cats: 1,870
From: Beaverton, USA
Default

Originally Posted by bbundy
re-sealed with Prmatex "Right Stuff" leak.
What I used (based on bobs recommendation)
No leaks so far.
Old Sep 26, 2015 | 07:02 PM
  #12  
jmann's Avatar
Junior Member
 
Joined: May 2008
Posts: 488
Total Cats: 17
From: Grants Pass, OR.
Default

I would have the trans out and then it is really easy to do. Remove the speedo gear, remove the cover on the tail hsg that the shfter sits in, remove the single bolt holding the control rod sleeve, remove the 8 bolts holding the tail hsg and it well come off after breaking the rtv loose. Or like Bob said you can do it without rmoving it. You can just clean the edges of the hsgs on the bottom with acetone, brk clean or whatever and spread some 'Right Stuff" across the seam say a 1/16" thick, they even make it in silver now. I'd have the trans at ambient air temp so the oil well be cool and less likely to seep until the rtv is cured.
Old Sep 26, 2015 | 11:10 PM
  #13  
patsmx5's Avatar
Elite Member
iTrader: (16)
 
Joined: Aug 2007
Posts: 9,405
Total Cats: 558
From: Houston, TX
Default

Originally Posted by jmann
... Or like Bob said you can do it without rmoving it. You can just clean the edges of the hsgs on the bottom with acetone, brk clean or whatever and spread some 'Right Stuff" across the seam say a 1/16" thick, they even make it in silver now. I'd have the trans at ambient air temp so the oil well be cool and less likely to seep until the rtv is cured.
As ghetto as that might be, given the alternatives I think I'll give that a shot! If it works, that would be way better than pulling this transmission.
Old Sep 28, 2015 | 04:17 PM
  #14  
patsmx5's Avatar
Elite Member
iTrader: (16)
 
Joined: Aug 2007
Posts: 9,405
Total Cats: 558
From: Houston, TX
Default

Originally Posted by patsmx5
As ghetto as that might be, given the alternatives I think I'll give that a shot! If it works, that would be way better than pulling this transmission.
So decided it won't hurt to try this. So I cleaned the area really well. The oil seems to be coming from the bottom area, but it's oily up both sides from the bottom by about 3 vertical inches up. So not sure if leaking up higher, or if oil was blown up.

After cleaning it all up, I noticed the bottom two bolts, the back side where the bolt threads into is open, and both had lots of debris stuck in the holes. This suggest oil is leaking between the housing surfaces to the bolts, and then through the threads. So I cleaned those out and put a little RTV inside those holes to seal that up just in case that's where the oil was leaking. Will now wait and see if it gets oily again, and if so, where.

It's only been sitting for 1 day so far and no driving, so nothing conclusive to report. Still if this fixes it without having to tear it down for repair that would be a victory in my book.
Old Aug 28, 2017 | 11:49 AM
  #15  
Engi-ninja's Avatar
Junior Member
 
Joined: Feb 2014
Posts: 331
Total Cats: 40
From: Columbus, IN
Default

Rather than start a new thread, I figured it would be better to reanimate this one. I seem to have the exact same leak as patsmx5, but I've already got my transmission out of the car to replace the clutch anyway. I'm a little trepidatious about dismantling the tailhousing, however. Would it be worth it to try the ghetto fix mentioned above, or should I just suck it up and remove the housing and re-seal it properly, since it's already out of the car?

Also, I went to Aidan's tutorial, but the pictures and description are all wacked out, making it very difficult to connect the wisdom with the picture.

*edit*
I guess I should add that it's a VERY small leak; it hadn't even dripped, there was just oil on the joint before we drained the fluid, and we couldn't find any oil anywhere else above the joint. So I guess a third option would be to just ignore it for now.

Last edited by Engi-ninja; Aug 28, 2017 at 12:11 PM.
Old Aug 28, 2017 | 12:10 PM
  #16  
aidandj's Avatar
SADFab Destructive Testing Engineer
iTrader: (5)
 
Joined: Apr 2014
Posts: 18,643
Total Cats: 1,870
From: Beaverton, USA
Default

God damn. They broke again?

Updated it again with the pictures and a direct link to the imgur album.
Old Aug 28, 2017 | 01:09 PM
  #17  
Engi-ninja's Avatar
Junior Member
 
Joined: Feb 2014
Posts: 331
Total Cats: 40
From: Columbus, IN
Default

Thanks Aidan!

Also, I finally found the 6 speed FSM...most helpful. I think I'll just pull the housing off and re-seal it.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
elesjuan
Build Threads
7
Nov 3, 2015 01:51 PM
mx592
Suspension, Brakes, Drivetrain
1
Oct 1, 2015 12:45 AM
zephyrusaurai
Meet and Greet
2
Sep 28, 2015 10:59 PM
Greasyman
General Miata Chat
2
Sep 28, 2015 10:44 AM




All times are GMT -4. The time now is 07:12 AM.