I've come to the conclusion that the notorious little knock sound after engaging in a gear and letting the clutch out is caused by some play in the transmission. I'd like to find the exact cause of this eventually, even if it means tearing my tranny apart. I've always wanted to find the root of the problem.

I know it has nothing to do with the clutch. If it did, it would make the sound when I was pressing/depressing the clutch in and out. I've talked about this with my auto instructor at school, he's convinced it is also has something to do with the tranny. The noise does come from the tranny..

One thing I'd like to check is the little clip ring at the top of the countershaft:

#11. It's supposed to fit into the little gap in the tranny casing when reassembling, correct? I don't think it would hit the tranny casing hard enough to make that noise...



Is there anything else on the shafts that can have some sort of play when it first gets the "jolt" from engagement? This would be more of a spinning jolt.

I need a helms manual, I'm just broke right now. I'm hoping that I run across someone who has dissected this problem. It's not really a "problem", but I've heard it on several B18's. Most people don't really care about it.

It's probably important to understand how the tranny gears and shift forks operate to form an idea of what it might be. I just can't picture it when I have my tranny off..

 

Not to doubt you or anything but I really don't think that it is the tranny. Did you have this before you took your tranny apart? Have you tried recreating the sound from a standstill? I would think more along the lines of a motor mount or suspension component. But if it is consistent and occurs with the car stationary, then it may be the trans. However, since the transaxle contains components that rotate at high rpms, any sort of significant slop could quickly turn into something serious. So I'd check it out ASAP.

 

Hey, check out my other thread on it. It'll tell you more about my assureness on this. (**** is that a word?)

https://honda-tech.com/zerothread?id=397791

Couldn't be from putting the tranny back together wrong either, I know I did that right.

It's one of those things where everyone has a stupid look on their face when I try to tell them about it. So.. I usually have to make the noise over and over with the car, and then people will recognize it. It's in all of the integras I've ridden in or driven. I REALLY don't think it's a problem, more of an annoyance. It feels like I've been driving a tranny that's been drag raced alot..

And it doesn't happen unless I'm at operating temperature. The hotter I make the engine by driving it hotter, the easier it is to make the noise. (It's not tranny fluid either, my fluid is brand new).

My g/f's 00 Si doesn't do it unless I really try to make it. So I know there's some normallness to it..

To make the noise, all you have to do is put the tranny in gear then let the clutch out like you would in stop and go traffic. It will make the noise when I let the clutch out in reverse as well.

So yah, I don't think it's a problem. It's just a sound when the load catches up with the tranny and it's ready to move. Know what I mean?

 

Also mark, have you done a compression test on your ITR motor/s? Can you give me the numbers? I'd like to compare my numbers with someone who lives within the same atmospheric pressure as me lol. I know my compression is good, but I'd like to know approximately how high it might read..

 

The assembly layout you have pictured is not the countershaft and #11 is not the snap ring that holds the countershaft, FYI.

 

I meant mainshaft, I'm sorry.

I also know this is not a snap ring. It's not a fastener at all IMO. if you can think of a better name, I'll change it for you if you need me to. We can call it "RING, BRAKE STOPPER" for now though...

Anyways, do you have an idea of what the problem might be?

 

My guess would be a bearing or the clutch disc.

 

I've been thinking bearing in the back of my head.. but I just don't realize how it could make that sound... All my bearings were seated tightly the last time I'd reassembled my tranny..

 

If a bearing is worn it can make noise. Does this happen in every gear or just first and does the noise increase in frequency with rpm?

 

No, only first gear or reverse.

It's an engagement clunk of some sort. At the grabbing point when letting the clutch out is when you hear it. Once it's been engaged, it somehow stays advanced in that position untill you are stopped and in neutral. Then when you are ready to take off again, and you put it in gear and let the clutch out, you hear the engagement clunk again.

The closest thing I could compare it to is say.. you have a clutch that can only be ON or OFF, when the peddle is in or out. There is no in between, no feathering, no slipping. And lets say you were ready to let it out and take off, all you will hear is a large engagement CLUNK when it engages your transmission. That's the sound and feel of what is happening.

The hardest part about this is describing what this is...




[Modified by Nameless, 10:23 PM 2/4/2003]

 

i think i know what ur talking about, the "clunk/knocking" noise after i shift and relase the clutch, it happens somtimes but not all the time, mostly from gears 1-3 and when i drive nomral. it dosnt happen when i push the car. it gets annyoyin with out the radio on, its weird though because the "clunk"knocking" sound comes from behind the glove comparment.

 

You wouldn't happen to have a set of radius bars would you?

 

synchros??? just guessing...

 

Nope. Why's that?

edit: I need some though! I also need my car lowered..


[Modified by Nameless, 11:36 PM 2/4/2003]

 

Cause I had a similar noise when I installed it before I bolted the cross bar down in the middle. How can you be 100% sure its the tranny? Check to make sure the motor mounts or suspension isn't loose somewhere.

 

The first transmission I broke in my old LS sounded like a friggin diesel engine, the bearings were shot.

 

well to let you guys know, i just took my car to the dealership and i had at "clicking" noise. They said they replaced a master cylinder and some bearing on my clutch. hope this helps

 

what are radius bars? i probly dont have them whatever it is.

 

I have this problem also. I never noticed it with my gsr tranny. I can feel and hear it sometimes while driving from a standstill. When I jack up the front and put the car in gear I can get the noise also. The one wheel will spin easily for an inch then clunk and both wheels spin. If I spin the opposite direction it will do the same again. I always thought it was just the lsd engaging.

 

I get that sound too. If i push in the clutch put it in first and pull it out of first and then let the clutch out i get that sound in my si. I have not heard it while driving though.

 

How can I be 100% sure? Because every B series transmission I've ever been in has done this. And it's only caused by moving the clutch in or out. It has nothing to do with the car because the car does not have to be moving to make this sound. Plus.. I've had people listen to it. If it was not my engine/tranny, I'd know it..

 

Sounds like you understand what I'm getting at.

This is a SINGLE noise. NOT a rattle, not a series of rattles. Just a clunk. SINGLE CLUNK when letting the clutch out and when the tranny is engaging, it comes DIRECTLY from the transmission. Does everyone understand?

 

Then it's not what I'm talking about...

It's a hollow clunk coming from inside the tranny case/clutch housing.

ENGAGEMENT is the best word I can give to help people understand what it sounds like. A SOLID engagement jolt sound. Stop, shift to first, let the cluth out, listen to the clunk. There's only one clunk sound.

 

Nameless: I've had this happen to me with 2 seperate transmissions, a b18C1 and now currently a B16A2 tranny.

At first I thought it HAD to be my failing GSR tranny, but after I installed an almost new B16 tranny, the noise came back. This leads me to believe that it has to be something seperate of the tranny itself, perhaps a loose or worn out motor/tranny mount. Hope this helps!

BTW, the clunking is more obvious after a few minutes of running.

 

From the description you quoted, it really sound like the LSD is making that noise. Maybe when the gears inside the LSD are making contact with the housing surface to lock in place.
The only other clicking moise that I have experience (on my ITR and earlier Civic)was the clutch release bearing.