Hi I'm a former Rx-7 owner who has recently converted to civic hatches. I have a 1990 hatch that is a believe a hf. When I got it, it made a tranny noise when the clutch pedal was not in, when pushed in the noise went away. To the best of my knowledge I thought this was a input shaft bearing. So I found a tranny from a friend off a crx with shorter gears that he said ran fine and made no noise or grinds. I swapped the tranny yesterday and when I started it today it made a slight chattering with the clutch out. It is wayyy quieter than the other tranny, but still is there. Im planning on rebuilding the other tranny but before I do that, I was going to ask what all could be wrong. Im used to Rear wheel drive so this is all new. What could make that noise?

 

i had the same problem and it was the throw out bearing. i changed it and problem solved

 

The throw out bearing usually makes a noise when you push the clutch in, and the input bearing makes a noise when the clutch is not in. Ill do some reseearch to see if in fact im wrong...but im pretty certain.

 

it can still make noise reguardless of position. mine did. But I would put my money on the input shaft bearing as you first mentioned. My friend had the same problem with his GSR. We replaced the t/o bearing but it still makes the noise so input shaft bearing is next on the list. Same symptoms as you.

 

what exactly did you replace when you reaplaced your tranny?

the noise after you swapped the tranny, you said it's a lot quit. Maybe you're a little too sensitive?

 

Rear wheel drive vehicles have the same exact parts to a clutch and transmission setup as a front wheel drive. The ONLY difference in the drive train is that instead of having a rear end the differential is built into the transmission on a FWD.

Now that we got that settled there could be a few reasons for chatter.

1.) The clutch/pressure plate is bad.

2.) The flywheel is cracked.

3.) The throw out bearing/release bearing is bad (it can make noise both while pressing the clutch and without having pressure on the clutch).

4.) The input shaft bearing inside the transmission could be bad.

5.) The pilot bearing could be bad, but typically this would squeal.

Sure there are others but they are HIGHLY unlikely, depending on what exactly the sound sounds like, it is hard to help you in the right direction.

 

When I pulled off the tranny everything looked fine. I checked the flywheel for cracks, but did not check the pressure plate. The clutch has barely any wear to it. But that was my initial thought...but I got a great deal form a buddy who did a B18 swap in his tranny.

I put 2 liters (approx. 2.07 q of 10w-40) in the tranny in the fill hole. I was thinking that the tranny was just dry.

But today the tranny is acting even wierder....it shifts great, no grinds, but at idle or start up the noise comes on at random times. The noise sounds like a bearing, but could be a pressure plate.

And also, correct me if I'm wrong, but I thought that the throwout bearing only made noise when the clutch was pressed on because it is making contact with the pressure plate. But I could see how I might be wrong. Might as well replace that bearing.

And rx7's have the same setup when it come to both having clutch, presure plate, flywheel...etc....but have to shift linkage. Im use to having a tranny right below me and being able to feel the shifter go directly into the tranny. shift linkage is new for me. Plus on my rx the tranny was much easier to get out and only required unbolting and pulling....the civic's have much less room for play and require a great deal to "shimmy" the tranny out. But im getting used to the fwd.

 

I swapped a whole "new" tranny in. I check it and put it in first for find out what kind it was off of. It has shorter gears and such.

the noise is tiny, but still is there....I may be sensitive...but I like cars to work exactly the way they should and also dont want to be standed if a bearing desides to detonate.

 

Did you replace the 8 dollar pilot bearing when you swapped trannies?

 

nope didnt. could this be the culprit

 

I was just about to say that. If you replaced the tranny with a "new" one then it shouldn't make any noise but you say it's still there.

Also, just keep in mind that you're car is not "brand new".. other things could make noises especially suspension component such as pushings and wheel/other bearings.

Hope you fix the problem.

 

ill check the oilot bearing out. Have to find it in my manual first.

 

it's in the center of flyweel.

 

I've heard stories of the same problem over and over again. I have the same problem with my tranny as well. The only solution that I've heard was to just replace the tranny.

 

Also another thought, are you sure it is not a heat shield rattling?

 

He already replaced the tranny with a "new" one.

 

this is a good point

 

Is it "new" or "new used."
Why would a brand new transmission still be making that rattling noise?
I can't find any explanation for it.

Here's what I do know:

The rattling usually occurs at high rpms and mainly low gears.
It also occurs in low rpms as well, but not as often.
The rattling also stops when the clutch is engaged.

It may be different with other cars, but these are some of the things
I was paying attention to in my car.

 

Check out this thread...

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/bad-throwout-bearing-2511309/

 

go read from the top carefully again.

 

OT : were you the guy with the username of RX7 who was banned for bashing HT and honda people? lol same join date as you

i'm planning an auto to manual soon and i sure will replace the clutch, pilot and throwout bearing to avoid noise (that is, if the noise is not coming from inside the tranny). you should do it too. cheap dollars for less headache

 

Heat shield on the exhaust mani? I have DCsports headers...no heat shield.

 

I was going to replace all my bearings and such on my old tranny, but I didnt care for the gearing and i got a great deal. So not only do i have the "new" tranny i have the other I can rebuild too. So Im going to tear my old one apart before I tear the newer shorter geared one.

 

I was not the guy under that username. Ive always respected the honda crowd but I wouldnt race them because my rx was fast.

But I was not about to rip the tranny out just to replace one bearing. Im going to replace all the necessary ones and upgrade the clutch while its out.

 

The cat can have a heat shield too you know. Especially if it is aftermarket they tend to have crappy welds. I never said it was on a specific part of the exhaust system...