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For 1990 and 1991 Nissan 300ZX 3.0L Twin Turbo models: To avoid clutch slippage, replace the master cylinder and clutch pedal return spring. Install the new master cylinder (Part # CMC250) and the return spring (Nissan Part #46585-30P16), and adjust pedal free play to 2-3 mm.
For additional information, refer to Nissan bulletin #MT92-006.