Miata clutch adjustment

Answer 1

You really can't adjust it unless you have the transmission separate from the engine and you can get to the clutch.

The clutch in the Miata is Hydraulic so if you having problems with you clutch most likely the problem is the master cylinder, slave cylinder, or you clutch is bad.

Correction 10/26/09:

The above is partly incorrect. While it is a hydraulic clutch, there is a mechanical adjustment at the clutch pedal itself, which allows you to adjust pedal height and freeplay. Contorting yourself to look up under the dash to see near the top of the pedal, you can see the stop/switch that prevents the pedal from rising any further from the floorboard. That can be adjusted by disconnecting the wires, loosening the locknut, and turning the stop/switch to the desired pedal height. Freeplay (the amount of pedal movement before feeling clutch resistance) is adjusted by loosening the locknut on the rod connected to the clutch pedal and going into the firewall. Turning the rod one way or the other will increase or decrease freeplay. If you are adjusting both, always adjust pedal height before freeplay, as pedal height affects freeplay.

Now, clutches in Miatas rarely require adjustment, and most cases where one seeks to solve a clutch that isn't fully disengaging, will find that the slave cylinder (on the transmission bell housing) is going bad. (common at 100K miles) The good news is it's fairly easy to replace. You just have to be careful to properly torque the mounting bolts. (easy to strip the aluminum threads, as it only requires 12 to 16 ft.lbs)