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Old 10-09-2021, 11:31 AM   #1
gnimelfnad
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Default Mp2 rebuild

Hey guys I was starting a rebuild on a sohc and mp2 I took out of this car before putting the dohc and mp3 in. Originally a mechanic thought a seal had broken and told me a kit would be a couple hundred to repair it so I just bought an mp3 and tossed it in, that was about a year ago. I'm inspecting the mp2 now to start to rebuild and I saw the case is cracked, and that's probably where all my fluid leaked out from, not the gasket that he had thought broke. My older brother does metal fab and has an aluminum tig so could I just have him drop a bead on it and itll be fine or is it junk now? And on another note I want to rebuild the whole car pretty much, see if I can do something like Highmile and keep it for over 300k at least.
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Old 10-09-2021, 01:04 PM   #2
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Default Re: Mp2 rebuild

Hard to see in the picture, but usually a cracked case is a busted diff pin. Probably junk - I'd take it apart to see. It's not that hard.
...
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Old 10-09-2021, 01:20 PM   #3
gnimelfnad
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Default Re: Mp2 rebuild

Ah that's good to know, thanks, ill get a better picture but I pretty much just wanted to know if I should bother to take it apart so that answers that
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Old 10-10-2021, 02:07 PM   #4
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Default Re: Mp2 rebuild

Not sure if im following the steps right the last time this happened I just ****ed up a roller bearing by accident but im pretty sure that a piece of the inner race melted to the shaft? Seems weird there would be plastic in here to melt in the first place.. there were bits of hard melted plastic debris around underneath the cover too..
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Old 10-10-2021, 03:30 PM   #5
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Default Re: Mp2 rebuild

Can't get the snap rings out with a pair of needle nose, are they supposed to move easily or do I need to get some heavy duty snap ring pliers?
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Old 10-10-2021, 05:49 PM   #6
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Default Re: Mp2 rebuild

My recollection is you squeeze them in, and lift the case up.

Did you find this?
https://sites.google.com/site/hunt4s...n/transmission
...
Bryan Cotton
'99 SL2, 5SP bought new
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Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
'98 SC2, 5SP bought 2018
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Old 10-10-2021, 07:51 PM   #7
gnimelfnad
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Default Re: Mp2 rebuild

Yes I did find that thank you, there must be stuff under the snap rings then because im squeezing so hard that the needle nose slip off and the ring doesn't move at all. Can you post video files here? I'll try to post one
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Old 10-10-2021, 10:29 PM   #8
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Default Re: Mp2 rebuild

You can post youtube links, but I'm not sure about video files directly.

It may be that the snap rings go out rather than in, I can't remember. It has been a few years.
...
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'99 SL2, 5SP bought new
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Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
'98 SC2, 5SP bought 2018
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Old 10-10-2021, 10:35 PM   #9
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Default Re: Mp2 rebuild

Ok, here is the word from alldatadiy:
Remove case-to-clutch housing bolts.
Use snap ring pliers to open output and input shaft bearing snap rings to allow the bearing snap ring grooves to drop below the snap rings. Use pry slots to separate case and clutch housing, and remove case.

So you pry the rings outward, and push the bearing down. That way you can pull the case up. The snap ring stays in the case, the bearing stays on the shaft.
...
Bryan Cotton
'99 SL2, 5SP bought new
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Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
'98 SC2, 5SP bought 2018
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Old 10-11-2021, 10:37 AM   #10
gnimelfnad
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Default Re: Mp2 rebuild

Haha okay of course it does, that's why it didn't move in at all. Thank you I appreciate that alot I was gunna go buy a pair of 20, 30 dollar ring pliers but not now! Where's that all data page? It wasn't in that Google site was it? I hope I didn't skip over that.
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Old 10-11-2021, 11:54 AM   #11
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Default Re: Mp2 rebuild

Most of the stuff looks alright theres a bit of wear on the gears, but gosh dang that magnet was fuuuulll I thought it was like a sponge or a filter at first, the pattern of the metal on the magnet was very distinct, like tilled soil haha. I suppose that the diff isnt really supposed to look like that though now is it. I also see where the plastic is coming from, when the case cracked and my fluid leaked out it made some hot spots on the forks and burned that plastic out
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Old 10-11-2021, 12:47 PM   #12
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Default Re: Mp2 rebuild

This looks like a broken diff pin:


That shaft is what the little gears spin on in the differential. The split pin keeps it in the case. Look at the pic from my thread, you can see the hole in the housing that the split pin goes into.


The split pin also goes through the shaft, through the little hole near one end.


The pin should not be flush with the little hole on the shaft. You can see how long the pin is here:
...
Bryan Cotton
'99 SL2, 5SP bought new
Rebuilt at 204,067 September 2017
Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
'98 SC2, 5SP bought 2018
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Old 10-11-2021, 09:26 PM   #13
gnimelfnad
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Default Re: Mp2 rebuild

Thank you i appreciate that. It looks like it has to come out that one way right? And is the mccallaster roll pin still the best thing to do or is there something more that should be done? Also what about the melted plastics on the forks? It looks pretty decent im not sure if it necessarily needs a rebuild and I know the rebuild is more expensive than another yard transmission but is it worth it if id like to have a flawless transmission? I am looking to keep the car as long as possible
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Old 10-12-2021, 09:26 AM   #14
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Default Re: Mp2 rebuild

I think the McMaster roll pin is good. I also think there are no rebuild kits available anymore, so your best bet is a used transmission with an improved pin. You can still get seals.
Your old gears saw a big impulse load when things got out of place and the case cracked. They may be ok, or maybe not.

I think you can drive the broken pin out either way. The hole goes all the way through.
...
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'99 SL2, 5SP bought new
Rebuilt at 204,067 September 2017
Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
'98 SC2, 5SP bought 2018
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Old 10-12-2021, 02:54 PM   #15
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Default Re: Mp2 rebuild

How about that roller bearing that fell apart? I think I saw on gm parts direct youre able to get some pieces for the mp2 and mp3
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Old 10-12-2021, 04:03 PM   #16
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Default Re: Mp2 rebuild

I've got no idea, sorry. Mine came apart nicely but it didn't blow the pin first.
...
Bryan Cotton
'99 SL2, 5SP bought new
Rebuilt at 204,067 September 2017
Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
'98 SC2, 5SP bought 2018
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Old 10-12-2021, 06:52 PM   #17
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Default Re: Mp2 rebuild

Thanks anyways man I appreciate the pictures. Maybe someone else like oldnuc will see and let me know if it's trashed or not. Im pretty sure it is. I think its a bit unusual that the roller bearing fell apart.
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Old 10-12-2021, 08:14 PM   #18
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Default Re: Mp2 rebuild

Quote:
Originally Posted by gnimelfnad View Post
Thanks anyways man I appreciate the pictures. Maybe someone else like oldnuc will see and let me know if it's trashed or not. Im pretty sure it is. I think its a bit unusual that the roller bearing fell apart.
That trans is unfortunately trashed with all of the shavings going through the trans while the diff pin was boring it's way through the case. You can also see the wear on the diff pin itself where the spider gears would sit.

It makes a great conversation piece if you keep it and clean it real well.
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Old 10-12-2021, 10:03 PM   #19
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Default Re: Mp2 rebuild

Quote:
Originally Posted by gnimelfnad View Post
Maybe someone else like oldnuc will see and let me know if it's trashed or not. Im pretty sure it is.
If OldNuc starts responding to you, I think your MP2 problems are over.

http://www.saturnfans.com/forums/sho...d.php?t=267101
...
Bryan Cotton
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Rebuilt at 204,067 September 2017
Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
'98 SC2, 5SP bought 2018

Last edited by Waiex191; 10-12-2021 at 10:04 PM. Reason: RIP OldNuc
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Old 10-14-2021, 12:17 PM   #20
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Default Re: Mp2 rebuild

Oh wow i had no idea, my condolences for his family and some of the extended family he had on here. This site wouldn't be the same without him his posts are everywhere. Rest in peace oldnuc
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