S2000 Under The Hood S2000 Technical and Mechanical discussions.

Installed new clutch, now grinding 1st and 2nd...?

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Old 03-11-2010, 08:21 AM
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Have someone pump the clutch and look under the car. See if the fork is moving its entire travel.
Old 03-11-2010, 08:48 AM
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You most likely have air in the lines. Bleeding a clutch is suuuuuuper easy.

U can do it with 1 person even.

Get a vacuum hose that fits over the bleeder hole tightly.

Get a water bottle or something. Fill it up a bit with brake fluid. Enough to submerge one tip of the vacuum hose into completely.

Get under the car, loosen the bleeder. Put the vacuum hose over the bleeder. Submerge the other end of the hose in the fluid.

Go back up top, make sure u have enough fluid in the master cylinder and pump the clutch up and down with ur hands. I said hands because you will have to pull the clutch up also.

keep checking the fluid level in the master cylinder while ur doing this.

Keep bleeding it till you've moved 1-3 master cylinder cupfulls of fluid.

U should end with the clutch pedal in its up position.

Test drive it. It might still need adjustment using the set screw under the dash.
Old 03-11-2010, 08:56 AM
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I would definitely start with bleeding the slave cylinder. However, it could also be an installation issue. Who installed it?
Old 03-11-2010, 09:47 AM
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Originally Posted by rob-2,Mar 10 2010, 10:10 PM
Did you bleed the system? Sounds like air.
Actually the system wasn't bled... I really don't know what kind of installation issue there could be. I know that the clutch is aligned because I can get the car into gear.

I will take a look at the cylinder, check the fluid levels and bleed it and see how things work out.
Old 03-11-2010, 10:07 AM
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Originally Posted by IIGQ4U,Mar 11 2010, 12:47 PM
I really don't know what kind of installation issue there could be.
It's been 6 years since I replaced the clutch on my '02 AP1, so I may not be far off on this ...

I believe the friction disk needs to be able to slide freely on the input shaft so that it will fully disengage when the pressure plate is pressed apart from the flywheel by the slave cylinder. If the friction disk binds on the input shaft (due to poor lubrication, etc.), then it may not fully disengage.

Again ... my memory may have this all wrong ...
Old 03-11-2010, 12:08 PM
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My question is why would a clutch or slave issue only affect first and second gear? All of the other gears are fine including reverse. Could this be a transmission synchro issue?
Old 03-11-2010, 12:23 PM
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The issue could be a transmission problem, but that would be quite a coincidence for it to appear immediately after a clutch swap. If it is a clutch problem, then it probably is causing the issue in all gears, but just not as noticeably. First and second gears are much more sensitive to grinding.
Old 03-11-2010, 01:15 PM
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Okay, perfect. I really hope that it isn't the synchros.
Old 03-11-2010, 10:00 PM
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Earlier this evening, I was moving the shifter without the clutch to see if there would be an obstruction and there was not. The shifter went directly into the first gear location and this of course caused a grinding noise. I did this for second gear as well and the result was practically the same. All of the other gears were as normal and did not allow the shifter to simply pass through... I am so confused.
Old 03-12-2010, 06:54 AM
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Did you check the fork travel?


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