How-To/DIY: Replacing Honda Transmission Input Shaft Bearing & Throwout Bearing

AH! Sorry for the delay! 😐

I’ve been MIA for months but I am determined to add more content to this site. I intend to dedicate time everyday to update a current draft and publish a new How-To/DIY article at least once a week. Sorry for any current subscribers and/or readers who have been waiting for new articles and the second part to Replacing a Honda Transmission Input Shaft Bearing & Throwout Bearing.

But here’s the second part of the How-To/DIY article to: Replacing Honda Transmission Input Shaft Bearing & Throwout Bearing. The first article illustrated how to remove the transmission so this article will show how to open it up and replace the essential bearings. Let’s begin! 😀



 

Warning: Use this guide at your own risk. I am not a professional and am not responsible for injury to you, your vehicle, or anyone/thing else if you choose to follow this guide.


 

 

Since the transmission is off the car, first you wanna remove is the vehicle speed sensor.

Remove Vehicle Speed Sensor copy

Now it is time to remove the throwout bearing and shift fork.

Remove old throwout bearing and shift fork (1) copy Remove old throwout bearing and shift fork (2) copy Remove old throwout bearing and shift fork (3) copy Remove old throwout bearing and shift fork (4) copy

Remove the back-up light switch with a 19mm wrench.

Remove back-up light switch (1) copy Remove back-up light switch (2) copy

Remove two 12mm set screws located under the transmission. Use a magnet to catch the steel balls after uninstalling the set screws.

Set screws & steel balls (1) copy Set screws & steel balls (2) copy

Remove the 14mm reverse idler gear shaft bolt.

Reverse Idler Gear Shaft bolt copy

Remove the 32mm sealing bolt with a 1/2″ ratchet. I used my Craftsman1/2″ ratchet and a hammer to loosen the bolt.

32mm Sealing bolt (1) copy 32mm Sealing bolt (2) copy

Now time for the daunting task of actually removing the transmission casing. o_O

First, here’s the numbered sequence for removing or reinstalling the transmission casing.

Numbered sequence to remove transmission casing copy

Okay now to actually remove the transmission casing. Remove all sixteen 14mm bolts and loosen the casing with a flat-heads. You cannot immediately remove the casing yet because the snap ring is clamped onto the counter-shaft. In order to lower the transmission housing, you need to use snap ring pliers to remove it from the groove of the counter-shaft bearing. If done properly, then there will be a “thumb” sound indicating the counter-shaft bearing is loosened from the snap ring.

Removing transmission casing (1) copy Removing transmission casing (2) copy Removing transmission casing (3) copy Removing transmission casing (4) copy Removing transmission casing (5) copy

Now jiggle the transmission casing off. Here you can see the groove where the snap ring clamps onto the counter-shaft’s bearing. There is a visual representation of the inside of the casing where I pointed out the “groove” for the counter-shaft’s “finger” to slide into when it is time for reassembly.

Removing transmission casing (6) copy Removing transmission casing (7) copy Removing transmission casing (8) copy

This would be a great opportunity to clean the transmission’s magnet.

Clean magnet (1) copy Clean magnet (2) copy

Uninstall the reverse change holder held by two 10mm bolts.

Reverse Change Holder (1) copy Reverse Change Holder (2) copy

Remove the reverse idler gear and reverse idler gear shaft by pulling it straight up.

Reverse Ilder Gear & Shaft copy

Remove the shift change holder assembly held by three 10mm bolts.

Shift Change Holder Assembly (1) copy Shift Change Holder Assembly (2) copy

Now that the shift change holder assembly and reverse change holder are both removed, it is time to remove the main-shaft, counter-shaft, and shift forks. Grab everything as one unit upward and out of the transmission casing. This will take some time but jiggle it around and the main-shaft, counter-shaft, and shift forks will surely come out. Lay the transmission components in a plastic sheet and cover them to avoid dust.

Removal of mainshaft & countershaft copyTransmission Internals copy

There will be two washers left, a regular washer and a spring washer. Remember that the spring washer is under the regular washer when reassembling the transmission.

Transmission washers copy

Now time to remove the old input shaft bearing out of the clutch housing. I used a 3/8″ extension with a 5/8″ socket and hammered out the old bearing.

Remove old input shaft bearing (1) copy Remove old input shaft bearing (2) copy Remove old input shaft bearing (3) copy Remove old input shaft bearing (4) copy

Remove the old oil seal with a flat head. Clean surface area for new bearing.

Remove old oil seal (1) copy Remove old oil seal (2) copy

Time to install the new OEM parts. WOOT! 😀

New Clutch Housing & Throwout bearings copy

Thoroughly clean the surface, press the new oil seal in the clutch housing and then press in the new input shaft bearing. I used my shift knob and old input shaft bearing and hammered the new one in, ensuring there was even pressure. You can use whatever you want but just make sure to have even pressure when pressing in the new input shaft bearing.

UPDATE: Press the bearing in with a Honda Bearing Driver (part #: 07749-0010000) and 52mmx55mm attachment (Part #: 07746-0010400), if you have access to them.

Otherwise, use a socket that measures the same size as the circumference of the bearings outer race, attach that to an extension, place over the bearing and drift into place.

*Thanks for the tip, EnjoyTheRideDC2.

Press in new input shaft bearing copy

Now that the new input shaft bearing in installed, it is time for reassembly. I did not record this part but will thoroughly explained in steps:

1) Position the spring washer and the washer onto the main-shaft bearing.

2) Install the main-shaft, counter-shaft, and the shift forks. Make sure to align the finger of the interlock with the groove in the shift fork shaft.

Reinstall the shift change holder assembly.

Reinstall shift change holder assembly (1) copy Reinstall shift change holder assembly (2) copy

Reinstall reverse change holder & reverse idler.

Reinstall reverse change holder & reverse ilder (1) copy Reinstall reverse change holder & reverse ilder (2) copy

Now I applied Permatex 81160 Hi-Temp liquid gasket to the surface of the transmission housing which is red in the image below and works with no problems.

Tip: When reinstalling sealer bolts and mating transmission case halves, be sure to use Hondabond, if possible.

*NOTE* Remove dirt and oil from the sealing surface; Seal the entire circumference of the bolt holes to prevent oil leakage; and If 20 minutes have passed after applying liquid gasket, reapply it and assemble the housings, and allow it to cure at least 30 minutes before filling with transmission fluid.

Seal transmission's case surface with liquid gasket copy

I did not record this part neither because reassembly can essentially be seen during dis-assembly above. But here are the next steps:
1) Install the dowel pins.

2) Install the transmission housing by aligning the groove in the housing with the finger of the main-shaft.

3) Lower the transmission housing with the snap ring pliers and set the snap ring in the groove of the counter shaft bearing.

4) Install the transmission hanger and back-up light switch clamp then tighten the transmission housing attaching bolts in the numbered sequence.

5) Install the 32mm sealing bolt with applied liquid gasket on the threads.

6) Install the reverse idler gear shaft bolt, set screws with steel balls, and back-up light switch.

For the next part, it is recommended by Honda to use only Super High Temp Urea Grease (P/N 08798-9002).

Super High Temp Urea Grease (1) copy

Now that the transmission is assembled back together, it is time for the shift fork and throwout bearing. Apply the Super High Temp Urea Grease to the parts shown in the images.

Super High Temp Urea Grease (2) copy Super High Temp Urea Grease (3) copy Super High Temp Urea Grease (4) copy Super High Temp Urea Grease (5) copy

Finished! Now reinstall the transmission back on the car which is the reverse orders from my previous DIY.

Thanks for reading my How-To/DIY article on Replacing Honda Transmission Input Shaft Bearing & Throwout Bearing. 😀 🙂

2 thoughts on “How-To/DIY: Replacing Honda Transmission Input Shaft Bearing & Throwout Bearing”

  1. Hi mr Admin. First of all thanks a lot for creating this blog. It has been very helpful to me and thousands of Honda enthusiasts out there. I have one question, is the part number for the input shaft bearing (91002-PS1-003), throw-out bearing (22810-P21-003) and the o-ring (91216-PH8-005) you mentioned above the same for SC4 B16A B-series gearbox? It’s a non-LSD manual ‘box, JDM model, the second generation B16A. Thank you in advance.
    -Raz from Malaysia.

    1. Thank you and you’re very welcome! 🙂

      Ironically enough, the transmission in this blog post is actually from a 1999 Civic Si (EM1). So to answer your question, yes they are the same.

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