How I opened my B series Honda transmission.

Set the Transmission on a pair of wood 2×4. This keeps the clutch shaft from hitting the ground.

Next, you will want to loosen the bolt on top. This covers a snap ring holding a bearing to the case half.

Just use a 1/2″ wrench.

Here is the view inside.

Next, to loosen a lot of bolts…

Here is a view of one side.

Now all those bolts are removed.

Remove the bolts on the side of the housing. And remove the reverse button (this button turns on/off your reverse lights).

There are little springs and ball bearings inside. be careful not to loose anything.

Now remove the bolt from the other side.

Now get your snap ring pliers out.

Here is an animated GIF image I made to show you how to click the snap ring out of place.

You may need a rubber hammer to gently tap the case loose. be careful, you do not want to crack the aluminum.

You can also fit a small pry bar in a few places to get the case a bit loose. but be careful not to chip or crack the case.

Here is another place the pry bar works.

After a few minutes shaking, prying, and moving it around, I got it open!

Don’t forget while your in the transmission to clean the magnet!!!

This was the 3rd time I had to open my transmission case.

1- Bought the car with a bad clutch, opened to inspect.
2- Rebuild with carbon synchros, new bearings, and changed 5th gear to LS gear.
3- Metal plate on freeway was pulled up into my transmission housing, causing a leak.

I used my Honda factory service manual to accomplish this job. Its a great resource for anyone working on their car.
It covers every step in good detail, and has lots of diagrams and information about everything on the car.
I highly recommend you get the manual and use my website to help visually.

I bought the manual for the 1994 Civic Del Sol because I have a Japanese b16 with USDM del sol smog parts and a y21 transmission.