My buddy decided he wanted to do a b20z in his hatch with a si tranny about 5 months ago. So I ordered all the parts including a tranny from a ht user and he said it was out of a 99si. All it had was the s4 stamp and it was missing the vin or sticker. So I ordered a fidanza flywheel and f1 clutch and pressure plate from ebay for a b series. I went to honda and got the fork that pushes the release bearing for a 99 si. I think it was a p80 fork. Everything worked fine for about five months until now and it sounded just like a release bearing going bad. Normally a bad throw out bearing starts chattering a lil then over a course of a year or so it gets worse, right? His went from slight chatter to this **** is completely bad and can hardly shift in like three days.

Now I own a b16 with the exact same clutch setup but my tranny is a jdm one off of I guess a 95 civic sir. So we pulled his motor and checked out the release bearing. It had a bit of rust and it seemed the bearings were ****ed cause they were spinning loudly and didnt have any spring in them. I told him we should pull the pressure plate but we kinda both agreed the throwout bearing was bad so we just replaced it with the one i had cause the part numbers matched up. He had already purchased one for a 99si and it wouldnt fit and had a different part number. (after some research we discovered this IS (the part store was right for once) the bearing for 99 si and i think its made by timkin cause the part # was similer to the one i just pulled and the one off of my car). I noticed that our shift forks where a lil dif, mine was a p21 and his was a p80 but his had a bigger hole and I noticed the ball it sits on in his tranny was a bit bigger than mine so we kept his shift fork. We put everything back togather and its still doing the exact same thing. Sounds just like a bad release bearing.

Now Im stumped, the part number for the only release bearing that would fit is 614068. The one for a 99 si is 614122 and one for a b20z2 is 614072. I can search the 614068 and find the bearing it just always says its for multiple hondas. If i give the parts store this number they are not able to put a vehicle to the part but they can order it.

So I guess my question is what throw out bearing do I need and what fork. I thought all the vtec b series where the same. I know that my clutch choice was a cheap but i dont think its the problem. My clutch stuff had all been used for 20k miles and I never had a problem but as soon as we put the exact same release bearing in his its messed up. Just someone please shed some light on what Iv just given u. Do u guys think it could be something else, maybe insid the tranny. Thanks so much and sorry for the novel
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well i finally found a matching number at advance. The release bearing iv been using is for a 88-89 prelude s, 86-87 acura legend 2.5 v6, or a sterling 827s sl (whatever that is). So wtf, should i be using this? The si one wouldnt even fit over the shaft.

Now my other friend who has a cx tranny on a d15b is doing the same thing but opposite. Like when the clutch is engage (clutch pedel is depressed) its making a ton of noise. I guess this one is the input shaft bearing. I used a exedy clutch for his but I ordered it off ebay so I think the same brand name pilot and throwout bearing came in his as the one for the b20 and mine. Im starting to think I just dont know how to install this properly but iv never had any problems with mine and its been taken a part at least twice in the past three years but its been running fine for those three years also. I didnt coat the input shaft or fork with locktite lubricant. I read somewhere that u should, do u think thats a problem?
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Clutch pedal depressed (which would actually be clutch disengaged) = throwout/release bearing

Clutch pedal up (clutch engaged) = input shaft bearing.

In other words your problem sounds like an ISB issue not a throwout bearing, your friend with the D15B needs a throwout bearing though.

 

depressed means clutch pedal is up (not pressed), means clutch is engaged. so i guess it is isb on the lil d but what about the b? We changed his throwout bearing to a known good one and its still doing the same thing. Hard to shift, noise when clutch pedal is pressed down (disengaged) and a it seems to slip a lil too.

 

that p21 clutch fork do you have a part number off it or what car did that come from