E153 3rd/4th gear synchro question - MR2 Owners Club Message Board
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post #1 of 3 (permalink) Old March 18th, 2017, 17:07 Thread Starter
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E153 3rd/4th gear synchro question

The question is not so much about the synchro's, but rather if the selector ring is installed backwards.

I'm in the process of rebuilding my '92 E153. I've ordered all new bearings, synchro's etc. As the original synchro's for the '92 E153 are discontinued, I've ordered the '93+ synchro's, including all surrounding parts (gears/shifter hubs), so that it essentially the same as the '93+ box. I've followed the workshop manual to reassemble the input and output shafts.

My question is regarding the selector ring on the input shaft, so for 3rd and 4th gear. Looking at the way the teeth on the synchro's, selector ring and gears are arranged, it just does not seem right. The teeth are asymmetrical on one side. It looks like the ring should be the other way around to match the teeth on the synchro's and gears, but the manual clearly says that the side with the groove should go to the front (so facing 3rd gear). Then again, some selector rings I see on the internet have a groove on both sides, one being bigger than the other one. Mine only has a small groove on one side.. Unfortunately none of the pictures I find on the internet clearly show the teeth of the selector ring.

I took some pictures and highlighted the problem area:

3rd gear (gear and synchro teeth are asymmetrical, selector ring teeth are symmetrical)

4th gear ( the other way around. Gear and synchro teeth are symmetrical, selector teeth are asymmetrical)

From above, in red the teeth in the selector ring as they are arranged now

On the output shaft, everything lines up as I'd expect, so all asymmetrical teeth are on the same side.

I hope you understand my question, as I'm having a hard time explaining this

Last edited by decipherer; March 24th, 2017 at 18:06.
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post #2 of 3 (permalink) Old March 24th, 2017, 09:55 Thread Starter
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No answers unfortunately.. In the meantime I searched all over the internet for a decent picture to see how it should be assembled. I could not find any clear pictures showing the selector ring. So then I decided it's probably best to try and understand how it works exactly, and watched this youtube video:

The part in the video that starts at 03:50 got me wondering if the selector ring lined up correctly with the synchro. It lined up like this (With the orange parts being the synchro's, the black parts the selector rings. Top is synchro to one side, lower is synchro to the other side.)

I don't think this is correct as with the synchro's to the right, the points of the teeth are almost touching. Turning the selector ring around results in the following fitment:

So I went ahead and changed it around. Synchro to the left:

Synchro to the right:

Last edited by decipherer; March 24th, 2017 at 18:14.
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post #3 of 3 (permalink) Old March 24th, 2017, 14:37
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Wish I had the answer for you but at least with your good description and diagram I understand the problem.

Wonder if anyone has a trans stripped down and can confirm OEM arrangement.

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