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DIY M2Y4 Transmission Rebuild Guide w/Pictures

 
View Poll Results: With this easy guide, will you tackle a trans rebuild?
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Old 07-02-2011, 01:42 AM
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DIY M2Y4 Transmission Rebuild Guide w/Pictures

This is for an M2Y4 & M2U4 transmission for a Honda Prelude.

Your specs could vary so check your manual (Chapter 13)

Quite a few inspections were left out to keep it shorter; the manual will have details/images of everything.

This is not intended to be a replacement for a manual.

You are responsible for any damages you do to yourself, others, or your vehicle.

Tape the splines of the input shaft to protect it and place the transmission down on some blocks so the input shaft does not touch the floor. Mine was level with the case so I did not tape my splines.



Using an 18mm wrench remove the backup light switch

Remove speedo sensor. Replace O-Rings.

Use a 3/8 drive socket wrench to remove the sealing bolt (we will get back to this in a minute)


Remove all the transmission housing bolts with a 12mm socket 14mm for the two bolts up top


Remove these two bolts, spring, and the metal ball


Remove bolt holding reverse


Remove housing for shift assembly, remove interlock bolt, and unbend the lock tab on the 10mm bolt




Slide arm shifter out and put to the side

There are three tabs you will use to separate the housing. You are only trying to break the seal, not remove the case yet. Once the seal is broken and the case can move up and down a little go to the next step.


Go back to the sealing bolt location and separate the snap ring while you put lift the case a little so that the ring moves out of the groove.



Now you can easily separate the housing watch that sneaky snap ring so it doesn’t go back in it’s place.


INSIDE THE CASE

With feeler gauges check the reverse shift piece pin clearance (.0xx-.0xx in) service limit (.0xx)




Using a 10mm socket remove the reverse shift fork.


You can now slide the pin and reverse gear out. I had to shift one of the synchro rings up to pull out the shaft.

Using both hands remove the input and counter shafts from the housing. It will probably require some jiggling to get them free.

You will have a washer and spring washer on the main shaft. These should be discarded and replace with new parts.


Remove the thrust shims for the main shaft. There is a metal oil guide plate under the shim for the main shaft, remove and clean it, replace if bent or dented. Also remove the oil guide and clean with brake cleaner.


Now use the bearing puller and slide hammer to remove the countershaft bearing.


And the input shaft bearing. After which you can remove the countershaft oil guide plate and clean it, replace if needed. Remove the input shaft and axle shaft seals and discard them.



You can now clean your transmission housing with brake cleaner. Clean the magnet. Paint case if you want.


After you've cleaned everything you can start the reassembly by replacing the side axle seal.



Push the input shaft oil seal back in. (make sure to put in the correct direction)


Tap the input shaft bearing in, make sure you use a drift that only contacts the outer race.
Tap the counter shaft bearing back in.


You can also put the oil guide plate back in the other half of the housing along with the snap ring and oil plate.

Shaft Break Down

Use a bearing puller to remove the main shaft bearing. Or you can press the entire assembly off like I did.


Press off all gears as an assembly and try not to drop the parts.

It helps to lay out all the gears the way it came off



Clean everything out with brake cleaner. Be sure to check the oil holes in the shaft for obstructions.

Inspect synchro rings and inside parts of the synchro sleeve for abnormal wear.


Reassemble gears in order. Make sure you line up the notch of the synchro to the hub. Also note the direction the "U" in the hub is facing. The main shafts bearing should have the words facing up and taper side facing the gears and stop.

Press the hub on to the shaft

There is a partially cut tooth in the synchro sleeve that must line up to that "U" in the synchro hub. Once that's on slide the other synchro then the next gear on.

Don't forget to put the 5th gear synchro sleeve back and that black ring with a lip before pressing on the main shaft bearing.


On the other shaft remove the lock nut and spring washer, they need to be replaced.

Use a gear puller to pull the countershaft bearing off or press it all off as an assembly

You should replace these friction dampers while you're here. (fathergoat’s image)


Put everything back together as you took it off.

After which replace the spring washer and nut, tighten to 80lb-ft and stake it.

Take both assembled shafts and place back into transmission as once piece with the arms. It will be a little hard but must be done this way.

Put the reverse shaft in then the idler gear.

The reverse fork is next. 11lb-ft

Line up the black ring with the case, install case, snap the ring and install a couple of bolts tightened to specs.

Install shift arm and selector

Check that all gears shift easily.

Remove case again and go to next step

Finished

Smear Hondabond all around where the housing halves will contact including where bolts insert.

Expand the snap ring when you put the two halves together.

Put the brackets back on but don't tighten the bolts.

Torque to 35lb-ft in this order. Some require less than 35lbs-ft. Check Manual



Honda Bond the sealing bolt and torque to 18lb-ft.

Install the passengers side axle oil seal if not already done. I added a little Honda bond on the outside of the seal before installing.

Reverse sensor.

Install shift arm, bend/stake the tab on to the 10mm bolt, smear Honda Bond and install cover. Tighten the four bolts to specs.






That's about it. Don't forget to REP and Post up pictures!
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'99 Honda Prelude - Auto > 5spd *Completed*

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Synchrotech Carbon Synchros
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M2Y4 & M2U4 Trans Rebuild Writeup

Mini Guide: Reverse Switch Harness

Last edited by dr2day; 01-13-2016 at 04:02 AM. Reason: Updated image links
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Old 07-02-2011, 01:49 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

Pictures of my completed rebuild project.

Upgraded to carbon synchro rings from Synchrotech - Honda & Acura Transmissions

Bought a kit from David with synchro, rings, seals, and bearings for less then $400

Many more images from the project can be found here
Attached Images
File Type: jpg IMG00174-20110624-1633.jpg (97.8 KB, 58 views)
File Type: jpg IMG00149-20110609-2001.jpg (85.2 KB, 45 views)
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'99 Honda Prelude - Auto > 5spd *Completed*

Fidanza 8LB Flywheel
Exedy Clutch & Pressure Plate
Synchrotech Carbon Synchros
AEM CAI
TSUDO Cat Back Exhaust

S2K AP1 Steering Wheel

M2Y4 & M2U4 Trans Rebuild Writeup

Mini Guide: Reverse Switch Harness

Last edited by dr2day; 07-02-2011 at 01:55 AM.
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Old 07-02-2011, 10:55 PM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

+1 rep for you sir, good write up!
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Old 07-04-2011, 11:01 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

great job man. I'm interested to see how this thing operates.


I can't believe I have to go through all of that to replace the input shaft seal. I hate life. haha
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Old 07-04-2011, 02:14 PM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

Great DIY. Pretty straight forward. We did a Honda Trans in the tranny class; cool stuff.
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Old 07-05-2011, 02:21 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

I thought it was really simple once I cracked it open and read the manual. Should only take an 1hr - 1hr 1/2 to completely disassemble then reassemble/inspect.

I didn't like my reverse switch so I took my clutch solenoid form the dying auto and did a little wiring to the male end of the auto trans switch.

NOTE YOU SHOULD USE A SHOP PRESS WITH THIS GUIDE!
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M2Y4 & M2U4 Trans Rebuild Writeup

Mini Guide: Reverse Switch Harness
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Old 07-05-2011, 02:28 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

Quick update on the trans.

It is in the car. Engine started and trans is nice and quiet. Shifts through all the gears very smoothly. Can't wait to put the wheels on and hit the road!
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Fidanza 8LB Flywheel
Exedy Clutch & Pressure Plate
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M2Y4 & M2U4 Trans Rebuild Writeup

Mini Guide: Reverse Switch Harness
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Old 02-17-2012, 04:34 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

Quote:
Originally Posted by dr2day View Post
Pictures of my completed rebuild project.

Upgraded to carbon synchro rings from Synchrotech - Honda & Acura Transmissions

Bought a kit from David with synchro, rings, seals, and bearings for less then $400

Many more images from the project can be found here
Is this comparable to the rebuild kit they sell at Autozone?
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Old 02-17-2012, 04:44 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

Not comparable at all. The carbon lining helps keep a nice smooth grin grabbing shift in low and high rpms where oem or aftermarket can not compete.
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Fidanza 8LB Flywheel
Exedy Clutch & Pressure Plate
Synchrotech Carbon Synchros
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S2K AP1 Steering Wheel

M2Y4 & M2U4 Trans Rebuild Writeup

Mini Guide: Reverse Switch Harness
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Old 03-06-2012, 01:06 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

wow man, I'm impressed. I would really like to do this sometime. On a scale from 1-10, what would you say this job was?

1 = easy
10 = hard
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Old 03-06-2012, 01:13 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

Should be easy with equipment and sspce. Give it a 4 out of 10.



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wow man, I'm impressed. I would really like to do this sometime. On a scale from 1-10, what would you say this job was?

1 = easy
10 = hard
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Fidanza 8LB Flywheel
Exedy Clutch & Pressure Plate
Synchrotech Carbon Synchros
AEM CAI
TSUDO Cat Back Exhaust

S2K AP1 Steering Wheel

M2Y4 & M2U4 Trans Rebuild Writeup

Mini Guide: Reverse Switch Harness
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Old 03-06-2012, 01:30 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

Awesome bro!!!! You give me hope lol
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Old 03-07-2012, 03:26 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

I just bought my rebuild kit from the website you posted to rebuild mine this weekend this is gonna help soo much lol I also was wondering if there was a way to lower the rev on 5th gear while driving on the highway. I found that an accord 5th gear will work and lower it but does anyone know which accord year? And will it still work with this rebuild kit?
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Old 07-28-2012, 08:08 PM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

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Originally Posted by tino209 View Post
I just bought my rebuild kit from the website you posted to rebuild mine this weekend this is gonna help soo much lol I also was wondering if there was a way to lower the rev on 5th gear while driving on the highway. I found that an accord 5th gear will work and lower it but does anyone know which accord year? And will it still work with this rebuild kit?
I used an (98-02) Accord P2A8 fifth gear in my M2U4 (SH) trans. It will also fit in an M2Y4 (base) trans.

80MPH now is 3400RPM
95MPH now is 4000RPM
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Old 07-28-2012, 11:47 PM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

While I don't need to do this yet, at least until I need to do a clutch job. Would it be good idea to throw in a Accord 5th gear, since I was told they are much better for highway than the h22's 5th gear? What gen Accord should I get the gear out of? While I might be mechanically inclined except here and there. Never messed with tranny stuff or anything major. Should I attempt this?
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Old 07-28-2012, 11:51 PM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

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While I don't need to do this yet, at least until I need to do a clutch job. Would it be good idea to throw in a Accord 5th gear, since I was told they are much better for highway than the h22's 5th gear? What gen Accord should I get the gear out of? While I might be mechanically inclined except here and there. Never messed with tranny stuff or anything major. Should I attempt this?
Give it a try its not really that hard. Search around forvthe revs you want to be st and find which accord has that gear ^_^
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M2Y4 & M2U4 Trans Rebuild Writeup

Mini Guide: Reverse Switch Harness
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Old 07-28-2012, 11:54 PM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

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Originally Posted by dr2day View Post

Give it a try its not really that hard. Search around forvthe revs you want to be st and find which accord has that gear ^_^
Do I want a lower ratio or higher? Sorry, I never understood the ratio number. Forgive my noviceness.

One I did find is a 0.685. Which according to this guide. It seems it would give me a better speed difference than the stock one. Though my knowledge of actual performance is zero in this field. So, opinion would be nice.

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Old 07-29-2012, 02:23 PM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

I didn't add the diff perload since it is almost an entire section it's self just for specs and what not. Also preload shouldn't change with just normal seal and synchro replacement.
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M2Y4 & M2U4 Trans Rebuild Writeup

Mini Guide: Reverse Switch Harness
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Old 09-29-2012, 02:12 PM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

This may not be the right thread but I have a 96 Si H23A that I was told last night had to have the tranny replaced (though I drove the car home almost 300 miles after I bought it last weekend). It is leaking and doesn't seem to really go into overdrive once in 5th gear - rpms don't vary much from 4-5.

That said, since I have the space, most of the tools and the original Honda manuals for my 92S - what is the best route for fixing the Si? I still question what is really wrong with it. It does make a grinding noise when in neutral which makes the ISB likely. But there were 2 clutches and the right CV joint done just before she couldn't drive it (no tranny fluid).
I got 30 mpg getting home and have no problem shifting in and out of gears. I just don't fully understand how the transmission is bad yet have no issues shifting and driving other than a higher than normal tach while in 5th and a grinding in neutral?
Is a rebuild on an H23A tranny similar to this one? thanks in advance, Kimberly
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Old 09-29-2012, 07:26 PM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

thanx!!!
bookmarked this thread
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Old 09-29-2012, 07:28 PM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

you probably saved me $500 or cost me a tranny but i'm make a stab at it this winter..
btw if it breaks i won't be sore at you but will kick myself for not getting my guy to do it
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Old 01-13-2016, 02:17 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

i know this post is old but is there any way to get the pictures to show?
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Old 01-13-2016, 02:20 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

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Originally Posted by Powerslave2112 View Post
i know this post is old but is there any way to get the pictures to show?
I don't have access to those images any longer but I'll see if they're still in the cloud.
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'99 Honda Prelude - Auto > 5spd *Completed*

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M2Y4 & M2U4 Trans Rebuild Writeup

Mini Guide: Reverse Switch Harness
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Old 01-13-2016, 03:14 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

Min
Quote:
Originally Posted by Powerslave2112 View Post
i know this post is old but is there any way to get the pictures to show?
Images are back. Hope this continues to help!

Pictures still aren't loading?
Try going to https://imageshack.us/user/d2dtk to view images until I get things straight.
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'99 Honda Prelude - Auto > 5spd *Completed*

Fidanza 8LB Flywheel
Exedy Clutch & Pressure Plate
Synchrotech Carbon Synchros
AEM CAI
TSUDO Cat Back Exhaust

S2K AP1 Steering Wheel

M2Y4 & M2U4 Trans Rebuild Writeup

Mini Guide: Reverse Switch Harness

Last edited by dr2day; 01-13-2016 at 04:14 AM.
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Old 01-14-2016, 06:03 AM
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Re: DIY M2Y4 Transmission Rebuild Guide w/Pictures

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Originally Posted by dr2day View Post
Min

Images are back. Hope this continues to help!

Pictures still aren't loading?
Try going to https://imageshack.us/user/d2dtk to view images until I get things straight.
Thanks a lot bud very helpful!
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