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Old 29-01-2018, 06:39   #1
madmatt
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Evo 6 front/rear diff preload/backlash

Cannot find anything in the workshop manual about the front diff preload/backlash on Evo 6 (TME with AYC). For the rear I found just the total bashlash, but not bearing preload.

I know they were meant to be replaced when "out of specs" but come on, there must be specs/tolerances somewhere?

I have the front diff on the table, with tools to measure backlash, and plastigauge ready.

Last edited by madmatt; 29-01-2018 at 09:51..
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Old 29-01-2018, 11:10   #2
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These specs are not available from Mitsubishi, because the unit wasn’t rebuildable by their own garages. Mitsubishi replaced the whole unit and did not rebuild the Tx and AYC rear diff.

I personally calculated the specs, and then confirmed they were correct after talking to Mitsubishi and Ralliart personel in Japan.

You also need to check pinion height and have the correct shims to adjust if it’s not correct. (Which you can’t buy)

To build these units properly, you need a lot of shims (4 types for each and multiple thicknesses) and the correct specs, otherwise it’s a lottery whether they are built right.
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Old 29-01-2018, 12:13   #3
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I don't know how to say it not to offend anyone, but here we go.

Although I understand keeping these infos away from everyone will make people go to transmission specialists for rebuilds (I know you are one), I find it a shame that people keep their little "secrets".

It doesn't matter these infos are shared, because 99% of the people will not be able to do the work themselves anyway. Not to mention the possibility to make a finger mistake or just miscalculation, not having all/right tools, etc.

Forums are here to share info and experiences. Only mention that you have "know-how" or the needed info doesn't bring anything to the community besides my reply here. If I had experience on something that is asked here, I would gladly share it, eventho this is part of my business. Again, not many people will do this kind of jobs themselves, and would rather trust a specialist.

That's just my 2 cents. I blame Mitsubishi in the first place, because what did they expect? I doubt you can find a new AYC rear diff these days. And its only gonna get worse, so why they didn't give rebuild info is beyond my understanding.

I am not going to have my unit sent for a rebuild because the cost of shipping + labour for something I can do myself will be more expensive than sourcing a used unit locally. So just gonna put everything back together and wait for it to go bang (if it ever happens).

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Old 29-01-2018, 12:48   #4
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Well, you cant blame Clive for keeping stuff secret that he has spent considerable ammount of time and money finding out.. as it is his core business...


If I was to overhaul the transfer and try to find out the preload spec, I would first consult some literature, such as
https://www.timken.com/wp-content/up...Brochure-1.pdf
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Old 29-01-2018, 12:58   #5
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Of course, but he mentioned it himself that he got info confirmed by Mitsubishi/Ralliart, so...

If nobody shared info we would not even be able to repair our car. Everyone knows the torque needed for wheel nuts, but not everyone has a torque wrench, and not everyone will even consider changing wheels himself.

Just my 2 cents...
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Old 29-01-2018, 13:06   #6
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Are you seriously comparing a Torque wrench value to Cliveís years and years of experience?

I know you have said you donít want to offend. But the above post IMO is taking the **** some what. Agreed forums are for sharing but youíre completely missing the point.

If you want it doing properly send it to Clive, I guarantee you wonít regret it.

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Originally Posted by madmatt View Post
Of course, but he mentioned it himself that he got info confirmed by Mitsubishi/Ralliart, so...

If nobody shared info we would not even be able to repair our car. Everyone knows the torque needed for wheel nuts, but not everyone has a torque wrench, and not everyone will even consider changing wheels himself.

Just my 2 cents...
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Old 29-01-2018, 13:13   #7
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What I want to say is that it doesn't mean that because the info is out there that nobody will send their diff to clive or whatever.

Anyway I stop here, I am sure I would not regret sending my diff to some transmission rebuilder, but I am qualified to do it myself assuming I have the manufacturer data, which I don't have.

The secret world of Evos...

P.S.: sharing is caring
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Old 29-01-2018, 13:23   #8
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Quote:
Originally Posted by madmatt View Post

P.S.: sharing is caring
in principle I agree with you (and I was maybe the first to share the diff pump rebuild procedure) and I do not care much for the "take it to a specialist" brigade, but I do understand his need to keep it to himself and I respect that
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Old 29-01-2018, 15:26   #9
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Quote:
Originally Posted by madmatt View Post
I don't know how to say it not to offend anyone, but here we go.

Although I understand keeping these infos away from everyone will make people go to transmission specialists for rebuilds (I know you are one), I find it a shame that people keep their little "secrets".

It doesn't matter these infos are shared, because 99% of the people will not be able to do the work themselves anyway. Not to mention the possibility to make a finger mistake or just miscalculation, not having all/right tools, etc.

Forums are here to share info and experiences. Only mention that you have "know-how" or the needed info doesn't bring anything to the community besides my reply here. If I had experience on something that is asked here, I would gladly share it, eventho this is part of my business. Again, not many people will do this kind of jobs themselves, and would rather trust a specialist.

That's just my 2 cents. I blame Mitsubishi in the first place, because what did they expect? I doubt you can find a new AYC rear diff these days. And its only gonna get worse, so why they didn't give rebuild info is beyond my understanding.

I am not going to have my unit sent for a rebuild because the cost of shipping + labour for something I can do myself will be more expensive than sourcing a used unit locally. So just gonna put everything back together and wait for it to go bang (if it ever happens).
You’re new around here, so I’ll let you off.

Are you really going to lecture me about giving info about Evo’s on this forum, that you’ve been involved with for 5 minutes?

I’ve been giving helpful tech info on the MLR for 17 years, most of that as a member, as well as writing tech articles for the magazine etc.

What have you contributed?

I’m not giving out specific tech info on a public forum, as other unscrupulous traders will steal this info and use it for their own gain, as they have with other stuff, coming to me as a customer, only to steal info and pretty well copy info straight out of my PM onto their adverts for transmissions on E-bay and Facebook etc.

Edited to add, I was going to PM you the specs, but due to your response and the fact that you want to post it on the forum, I’m not willing to share it with you now I’m afraid.
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Old 29-01-2018, 15:50   #10
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I didn't know the joining date on a forum meant that you have the right (or not) to share an opinion...

No hard feelings
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Old 29-01-2018, 15:53   #11
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Clive as i recall on one of your other threads you do not do ayc diffs?
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Old 29-01-2018, 18:48   #12
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Clive as i recall on one of your other threads you do not do ayc diffs?
https://www.lancerregister.com/showthread.php?t=562690

Yes, I rebuild them, depending on what is wrong with them.

Certain parts are available, and some are crossed over from the RS diff, but a lot of parts aren’t available.

I do have a lot of second hand AYC and SAYC diffs, stripped for spare parts, so I can also use those, depending on the circumstance and the customer.
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Old 29-01-2018, 18:55   #13
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Quote:
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I didn't know the joining date on a forum meant that you have the right (or not) to share an opinion...

No hard feelings
Really, it sounded to me like you were telling us all about what the MLR is here for.

I tell you what, you start a business, spend a massive amount of time and money developing something, and then give that info away to everyone on a forum. Once youíve done that, you can come back to us and preach.

Up to that point, youíre just somebody wanting something for yourself, and spouting off when you donít get your own way.
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Old 29-01-2018, 19:30   #14
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I didn't even understand the question
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Old 29-01-2018, 19:51   #15
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Madmatt: itís called Intellectual Property rights, the cornerstone of many businesses, you need to do some reading on protecting your rights as Clive says and then maybe youíll be less abrasive to a highly respected member of this Forum. I think itís safe to say that you managed to offend.


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