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2016 m6 transmission case bolts

BULL

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Thread Starter #22

AeroF16

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#23
This is what @16GoManGoHC2 recommended to me. Said the dealer told him this is what they use. He and I have used it with no problems but it’s a little late now since you have the trans back together!

I searched and never found the torque values you’re looking for, so I just tightened them by hand until it felt good.

8B7B6F46-D31E-48C0-9B5C-4A440CED967F.jpeg
 


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Thread Starter #24
Well Bull you could be right. Now after 60 miles 3rd gear is grinding. Mantic says to put more miles on the clutch to break in. I’m thinking every bad possible thing like maybe I should have left the input shaft dry. Also the xmission was over serviced which if fixed. Feel kind of weird skipping 3rd for another 400 miles hoping it would get better. I’m thinking things to do before pulling tranny again is purge fluid and go back to factory or royal purple/amsoil, or maybe the clutch isn’t quite bled. Any ideas? Kind of embarrassing but this is my first time doing this kind of work. To add after reaching out to Mantic they said as long as 1st and reverse works then the clutch is probably fine. Now I’m thinking I should have went a8….
 


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Thread Starter #25
This is what @16GoManGoHC2 recommended to me. Said the dealer told him this is what they use. He and I have used it with no problems but it’s a little late now since you have the trans back together!

I searched and never found the torque values you’re looking for, so I just tightened them by hand until it felt good.
I think if I pull tranny again I’m going with no lube at all. Mantic recommends it to be dry as anything could collect dust and bind
View attachment 78373
 


AeroF16

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#26
Well Bull you could be right. Now after 60 miles 3rd gear is grinding. Mantic says to put more miles on the clutch to break in. I’m thinking every bad possible thing like maybe I should have left the input shaft dry. Also the xmission was over serviced which if fixed. Feel kind of weird skipping 3rd for another 400 miles hoping it would get better. I’m thinking things to do before pulling tranny again is purge fluid and go back to factory or royal purple/amsoil, or maybe the clutch isn’t quite bled. Any ideas? Kind of embarrassing but this is my first time doing this kind of work. To add after reaching out to Mantic they said as long as 1st and reverse works then the clutch is probably fine. Now I’m thinking I should have went a8….
Did you have any of these issues prior to swapping the clutch out?

When I lubed the input shaft, I cleaned the heck out of it, then wiped the grease on, then basically wiped it all back off. I didn’t clean it off just wiped it with a clean rag and I just left the thinnest of layers on it.

My M6 can be stiff in 2/3/4 until it’s warmed up. Not grinding per se, just notchy going into gear, difficult to explain. I can avoid it if I really take my time shifting slow. However, sometimes it shifts great right out of the garage.

I have never figured it out but I’m not messing with it anymore. Just accepting that’s how this trans is, at least until something breaks haha.
 


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#27
I'm not suggesting that the Krytox was the wrong grease for it qualities, but for its possible side effects and cost.

My first thought (more of a guess really) is that the clutch isn't fully disengaging and causing asynchronous gear speeds for the shifts. There are three discs after all. There's a lot to "catch".

You may be inherently "most out of sync" in speeds for your 3rd gear shift?? (Just by your subconscious style)

Try intentionally changing up your shift speeds and see if if changes any...

Unless it's REALLY grinding, give it a few days?
 


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Thread Starter #28
No issues prior to changing clutch and flywheel. I can drive it just have to skip 3rd. The first 50 miles all gears were fine, I will give it some time to break in a bit and hopefully that helps. Guess I’m going to get really good at r&r’ing my transmission before this evolution is over lol.
It does make sense that one of the discs are hanging up it’s just weird it only happens with 3rd
 


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AeroF16

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#29
No issues prior to changing clutch and flywheel. I can drive it just have to skip 3rd. The first 50 miles all gears were fine, I will give it some time to break in a bit and hopefully that helps. Guess I’m going to get really good at r&r’ing my transmission before this evolution is over lol.
It does make sense that one of the discs are hanging up it’s just weird it only happens with 3rd
Well I feel like mine does this every once in a while. I think I’ve just learned when I expect it to act up and have changed my shifting habits to accommodate it.

Whatever you find out, please keep us updated!
 


16GoManGoHC2

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#30
Double pump the clutch peddle for your 2 to 3 shift and see if it makes any difference in grinding going into third. Where does the clutch start to grab when letting the pedal out? Near bottom, middle, or top?
 


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#31
Sub'd I just got the mantic triple. May be few weeks before install...
 


16GoManGoHC2

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#32
Finally weighed my Mantic triple, here’s its weight and the weights of a stock unit and a Mcleod RXT1200HD on a Ram Alum flywheel.
Here’s the Mantic and it’s flywheel
4633C719-A0B5-443A-A3F7-999E447BF1CF.jpeg DDC8ADB9-4B42-4974-BB5A-409D4D3DDD38.jpeg
Here’s weights on the stock unit and McLeod.
Stock clutch (38.44 lbs) and flywheel (23.50 lbs) = 61.94 lbs for the assembly
McLeod clutch assy (40.78 lbs) and Ram Flywheel (19.24 lbs) = 60.02 lbs for the assembly
Mantic clutch (31.82lbs) and Mantic Flywheel (11.62 lbs)= 43.44

So the Mantic assy is 18.5 lbs lighter then stock and 17.38 lbs lighter then the McLeod/Ram combo. Along with the Mantic clutch Assembly being about 4” in diameter smaller then where the weight is in the stock and McLeod setup and 18 lbs avg lighter then both should greater reduce MOI for quicker spool up and be easier on synchros in high rpm shifting by letting engine rpm drop off quicker off throttle. Unfortunately I won’t be changing my clutch out until my RXT1200HD gives up it’s ghost which may be a long while as it’s been doing fine so far.
 


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#33
~18lbs is a lot...


Maybe worth the effort...


:unsure:
 


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