OEM TOB MD749998 Click Normal?

Artago · Dec 7, 2013

Got a brand new TOB. The bearing is off center and the bearing click pops back and forth. Is this normal?

This is one of the new replacement TOBs MD749998. My old OEM TOB is not off center.

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Video:
[ame]http://www.youtube.com/watch?v=VuQq37Q98bw[/ame]

crimsondragon · Dec 7, 2013

That won't work. It won't even go on with the TOB attached to the fork. What's the backside look like? The sleeve should be centered with the backplate.

Artago · Dec 7, 2013

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The back housing "clips" seem like they are off center. You can't tell from the photos but using your fingers and feeling it you can tell it's crooked.

twicks69 · Dec 7, 2013

Take it to Mitsubishi and exchange it since it is a new defective part.

Paul@RTM · Dec 7, 2013

Believe it or not, OEM TOB's are supposed to look like that:

http://www.dsmtuners.com/forums/newbie-forum/458690-new-throwout-bearing-looks-bad.html

Artago · Dec 7, 2013

Paul@RTM said:
Believe it or not, OEM TOB's are supposed to look like that:

http://www.dsmtuners.com/forums/newbie-forum/458690-new-throwout-bearing-looks-bad.html

It's not that I don't believe you, but that's hard to believe

So sketchy.... OMG

Since it's not symmetrical, which way do you install it?

crimsondragon · Dec 7, 2013

Paul@RTM said:
Believe it or not, OEM TOB's are supposed to look like that:

http://www.dsmtuners.com/forums/newbie-forum/458690-new-throwout-bearing-looks-bad.html

I'm going to have to respectfully disagree.

Artago, the reason I asked for the backside is to confirm it's not the actual sleeve itself misaligned but the bearing is. Hold the bearing in your hand then push with your thumbs on the bearing ring and nothing else to recenter it. There's alot of clearance underneath the outer housing and the only thing keeping the bearing in place is a spring washer underneath and the clips from the cover to the backplate.

twicks69 · Dec 7, 2013

The mounting tabs should be square, if they are not even that is the key thing. The bearing can be shifted back to center as it can float a little bit. If they are all funky I normally return them to Mitsubishi, but again, I am a wholesaler for Mitsubishi.

crimsondragon · Dec 7, 2013

As Tim said, slide the bearing back into center. You can see how much room it has to shift around in the housing cover.

Lofty · Dec 7, 2013

Doesn't look right to me.

Would return. Too much run off IMO.

snowborder714 · Dec 7, 2013

I just pulled out a spare brand new OEM one I've got and the center bearing is a bit off center. When measuring in similar locations you did (90° from the mounting tabs) and the same points you used on the bearing, I got 11.58mm and 9.98mm

Not quite sure I understand how you think the clip areas are not centered. I kind of get the feeling they aren't when looking at the little triangles on either side of them (when viewed from the back), but I think it's just an illusion. Mine don't feel off center and measurements taken through the hole to the center of the bearing match up side to side.

I wouldn't hesitate to run the bearing I have, even with the center part being off. As Tim said, it can move around and go where it needs to be.

DGajre777 · Dec 7, 2013

The TOB I bought years ago was off center and had similar play. I installed it, worked fine...

Artago · Dec 7, 2013

So I tried moving the bearing ring and this happened....

[ame=http://youtu.be/VuQq37Q98bw]MD749998 TOB Click - YouTube[/ame]

So it looks like it's supposed to move around leading me to believe this is normal.

Thoughts?

IrishBeatdown · Dec 7, 2013

My TOB was just like that, still going strong. I think you are fine.

Paul@RTM · Dec 8, 2013

That bearing seems a bit "loose" to me. I've never seen a brand new one that was so easy to push around like that. Usually they're very firm. Certainly they would tend to loosen up with use, but that does seem a bit strange it's like that brand new.

As for talk of mounting tabs, maybe there's something I'm not understanding. The back plate is a stamped unit that includes mounting tabs/ears/whatever you want to call them and the "centrebore". This is a single stamped unit, the only way the centrebore and mounting tabs could be "out" (or whatever you'd want to call it) is if the piece were mis-stamped. Of course it's possible for a manufactured part to be mis-stamped, but if in doubt measure with your vernier. Measure from each mounting tab to edge of centrebore. I'd eat my skid marked underwear if that stamped backing plate was somehow out. (But again, I could be misunderstanding the reference to mounting tabs and out-of-squareness)

Of course, there's several other components that make up that whole assembly and any of them can have some kind of issue/defect, so anything's possible. Like I said at the top, that bearing seems a bit looser than I'm familiar with, but that's hardly proof that something's wrong. It might be worth returning for replacement just for peace of mind.

snowborder714 · Dec 8, 2013

Artago said:
Can anyone comment on the video?

I'm not able to move my new OEM unit like that. That does make me uneasy and would return it.

Artago · Dec 8, 2013

snowborder714 said:
I'm not able to move my new OEM unit like that. That does make me uneasy and would return it.

Was it the new style, TOB MD749998?

PieEyedPiper · Dec 9, 2013

Paul@RTM said:
Believe it or not, OEM TOB's are supposed to look like that:

http://www.dsmtuners.com/forums/newbie-forum/458690-new-throwout-bearing-looks-bad.html

twicks69 said:
The mounting tabs should be square, if they are not even that is the key thing. The bearing can be shifted back to center as it can float a little bit. If they are all funky I normally return them to Mitsubishi, but again, I am a wholesaler for Mitsubishi.

snowborder714 said:
I just pulled out a spare brand new OEM one I've got and the center bearing is a bit off center. When measuring in similar locations you did (90° from the mounting tabs) and the same points you used on the bearing, I got 11.58mm and 9.98mm

Not quite sure I understand how you think the clip areas are not centered. I kind of get the feeling they aren't when looking at the little triangles on either side of them (when viewed from the back), but I think it's just an illusion. Mine don't feel off center and measurements taken through the hole to the center of the bearing match up side to side.

I wouldn't hesitate to run the bearing I have, even with the center part being off. As Tim said, it can move around and go where it needs to be.

DGajre777 said:
The TOB I bought years ago was off center and had similar play. I installed it, worked fine...

Paul@RTM said:
That bearing seems a bit "loose" to me. I've never seen a brand new one that was so easy to push around like that. Usually they're very firm. Certainly they would tend to loosen up with use, but that does seem a bit strange it's like that brand new.

As for talk of mounting tabs, maybe there's something I'm not understanding. The back plate is a stamped unit that includes mounting tabs/ears/whatever you want to call them and the "centrebore". This is a single stamped unit, the only way the centrebore and mounting tabs could be "out" (or whatever you'd want to call it) is if the piece were mis-stamped. Of course it's possible for a manufactured part to be mis-stamped, but if in doubt measure with your vernier. Measure from each mounting tab to edge of centrebore. I'd eat my skid marked underwear if that stamped backing plate was somehow out. (But again, I could be misunderstanding the reference to mounting tabs and out-of-squareness)

Of course, there's several other components that make up that whole assembly and any of them can have some kind of issue/defect, so anything's possible. Like I said at the top, that bearing seems a bit looser than I'm familiar with, but that's hardly proof that something's wrong. It might be worth returning for replacement just for peace of mind.

snowborder714 said:
I'm not able to move my new OEM unit like that. That does make me uneasy and would return it.

These posts nicely sum up my experience.

Artago, return the one you have and get a replacement. It is my opinion, and obviously that of a few others, that your TOB exhibits other issues beyond the common occurrence of it being off center.
Being off center does not concern me. Clicking and potentially mis-stamped backplates/tabs, however, do.

Artago · Dec 9, 2013

Just got off the phone with ExtremePSI. The tech there had a look at another one and it does not have that play according to him. So it's defective. They are sending a replacement. Will post update when I get it.

snowborder714 · Dec 9, 2013

Glad to hear they're helping you out. Also good for you on being observant and finding that before you installed it and had it cause major issues :thumb:

Paul@RTM · Dec 9, 2013

Glad to hear they're helping you out. Also good for you on being observant and finding that before you installed it and had it cause major issues

This and this. The guys at Extreme have been straight shooters for years, so their response doesn't surprise me a bit.

Whophlungpoo · Dec 9, 2013

I wouldn't give that TOB to my ex girlfriend. Glad you caught it tough.

Artago · Dec 10, 2013

snowborder714 said:
Glad to hear they're helping you out. Also good for you on being observant and finding that before you installed it and had it cause major issues

Thanks. I'd hate for something like this to destroy my motor and brand spanking new (built) 2.1 Utlimate Synchro Trans from Jack. Just waiting for a pressure plate and a new TOB and I can throw that bad boy in.

Paul@RTM said:
This and this. The guys at Extreme have been straight shooters for years, so their response doesn't surprise me a bit.

They are indeed. Most of my business goes to them.

Whophlungpoo said:
I wouldn't give that TOB to my ex girlfriend. Glad you caught it tough.

Artago · Dec 17, 2013

I received the replacement bearing from extremePSI and it has the exact same click/play as the first one.

So either this is normal or the entire batch is defective.

Thoughts?

crimsondragon · Dec 17, 2013

Center it as best you can and run it. Like I said before, there's a lot of space underneath that cover. The only thing keeping that bearing in place is the pressure exerted by the spring washer on top of the bearing. It's bound to move if you push it to the side like that but it won't see any forces like that when installed. If anything, if your flywheel step is correct, the pressure plate fingers should be pushed outward a little bit. It'll probably self center when you push the clutch in.

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