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Transmission leaking at the control shaft #453690
August 31, 2017 01:06 am UTC
August 31, 2017 01:06 am UTC
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Rob Strelecki Offline OP

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The leak seems to start there. No oil found above it. The boot and surrounding area was soaked. Peeled the boot back and it was wet inside.

[Linked Image]

Any ideas why that would happen?

It's possible I slightly overfilled it as only the front of the car was on stands.
Nothing comes out of the fill hole now when I remove the bolt with the car level.

I drove about 150 KM since the trans went in and then I noticed the drip. I'm pretty sure it wasn't leaking before.


1993 Eagle Talon TSi FWD
13.8 @ 106 :::: 14.1 @ 117
Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453692
August 31, 2017 04:12 am UTC
August 31, 2017 04:12 am UTC
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Rob Strelecki Offline OP

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Did some googling. The seal on the shaft is likely shot. Some say it can be patched with RTV. Almost impossible to change the seal without opening the trans. frown

Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453695
August 31, 2017 01:06 pm UTC
August 31, 2017 01:06 pm UTC
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Caledon, Ontario, Canada
Bryan Lawrence Offline
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Damn that's too bad! Thanks for updating us!


"Old Blue" 91 Talon TSi AWD
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Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453697
August 31, 2017 01:15 pm UTC
August 31, 2017 01:15 pm UTC
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Stanstead, Quebec
Jason Drew Online content
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Originally Posted by Rob Strelecki
Almost impossible to change the seal without opening the trans. frown


Yup, you need to remove the roll pins from the forks to get the shaft out.

Your transmission vent isn't blocked up or anything> (creating pressure inside the trans). The seal would have to be pretty bad/non existent for it to leak at this location, it's kind of out of the way of oil slinging around in the transmission.


1997 Eclipse GST - AWD swapped - TPC - GT Spec powered
2023 - 9.63 - 145mph
Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453698
August 31, 2017 01:19 pm UTC
August 31, 2017 01:19 pm UTC
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Rob Strelecki Offline OP

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I doubt there is blockage since the trans just got a very thorough cleaning.

I just tried to get more fluid in and I couldn't get even one squirt into the fill hole. So maybe there is some weight to my overfill theory?

I'm going to do another 150 KM today and we'll see if the situation improves.

Thanks!

Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453700
August 31, 2017 01:22 pm UTC
August 31, 2017 01:22 pm UTC
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Stanstead, Quebec
Jason Drew Online content
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Might be possible on the overfill, the t-case will leak out the vent if overfilled but also suspect the seal is probably damaged too.


1997 Eclipse GST - AWD swapped - TPC - GT Spec powered
2023 - 9.63 - 145mph
Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453706
September 01, 2017 04:26 pm UTC
September 01, 2017 04:26 pm UTC
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Rob Strelecki Offline OP

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From what I was reading, people with this problem get a pumping action from the gear shifting that squirts the oil out.

It seems to have leaked a lot less on the last drive, but it could just be how the last drive was (e.g. less stop & go shifting).

I had cleaned the control shaft area really well and didn't see much wetness there. However, the clutch fork boot is pretty soaked. It seems to accumulate there, of course that is a low and protruding point.

It could still be the trans input or output shaft seals, or maybe a cracked case. I'll continue to inspect.
Less likely but possible is the engine rear main seal, but I'm pretty sure the oil is Syncromesh by the smell.

Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453707
September 03, 2017 01:22 am UTC
September 03, 2017 01:22 am UTC
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Jason Drew Online content
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You're using syncromesh in your trans?


1997 Eclipse GST - AWD swapped - TPC - GT Spec powered
2023 - 9.63 - 145mph
Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453708
September 03, 2017 02:20 am UTC
September 03, 2017 02:20 am UTC
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Rob Strelecki Offline OP

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Yep, it's always worked fine for me.

Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453709
September 03, 2017 03:11 am UTC
September 03, 2017 03:11 am UTC
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Stanstead, Quebec
Jason Drew Online content
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I wouldn't run it in my car, it used to be common in the past but pretty much every trans builder now concludes it just doesn't offer the required protection.

Direct from Jon at TRE

Quote

Synchromesh/Synchroshift gear oils

While it has been found that the Synchromesh/Synchroshift type oils can sometimes improve the effectiveness of the synchronizers, allowing for faster shifts at higher rpms, this oil does not have enough film strength to ensure long gear and bearing life for the Mitsubishi transmissions.

Synchromesh/shift type oils are used in transmissions that are found in low torque applications that don’t ask much from the oil in regards of film strength. Transmissions that call for Synchromesh type gear oils are designed with wide gear shaft spacing which greatly reduces the force on the gear teeth and large bearings so that they can use these low film strength oils. The reason behind it is to reduce parasitic frictional losses and to improve shift quality.

If you have a weak synchro, you may want to try the “Synchromesh/Synchroshift” type oils but it is our recommendation that you use the proper GL rating that the transmission was designed to use and prepare for a rebuild.


1997 Eclipse GST - AWD swapped - TPC - GT Spec powered
2023 - 9.63 - 145mph
Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453710
September 03, 2017 05:08 pm UTC
September 03, 2017 05:08 pm UTC
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Rob Strelecki Offline OP

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Well I am definitely from the past lol
What's recommended these days? I don't ask a ton from my trans, no high rpm shifts or launches.

I feel like Syncromesh helped me get into 2nd at high rpm, but really not a concern anymore.

Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453712
September 03, 2017 07:34 pm UTC
September 03, 2017 07:34 pm UTC
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Kitchener Ontario
Stephen Richardson Offline
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Anything GL-4 will suit your needs just fine Rob. Of course there are good better and best brands, but if you arent Johny racecar driver you wont notice any difference as a daily.

Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453713
September 03, 2017 07:56 pm UTC
September 03, 2017 07:56 pm UTC
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Stanstead, Quebec
Jason Drew Online content
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OEM 6 speed or MT90 is the go-to for stock to mild power levels

For slightly more you can get Motul Gear 300 75w90 which has a stronger film strength and I found gave smoother shifts.


1997 Eclipse GST - AWD swapped - TPC - GT Spec powered
2023 - 9.63 - 145mph
Re: Transmission leaking at the control shaft [Re: Rob Strelecki] #453719
September 07, 2017 04:14 pm UTC
September 07, 2017 04:14 pm UTC
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Rob Strelecki Offline OP

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Thanks for the advice tu

The verdict is in!
It's completely stopped leaking. I tried to get more in and it's definitely full.
Somehow the extra was pushed out, no more no less.
I'll remember to pull the fill plug on level ground next time tongue

Next on project leak-free: Boost leaks.


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