Honda Acura NSX 1991 Service Manual page 517

9. install the disc spring.
NOTE:
Install the disc spring in the right direction.
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DISC SPRING
10. Soak the clutch discs thoroughly in ATFfor a minimum
of 30 minutes.
11. Starting with a clutch plate, alternately install the
clutch plates and discs. Install the clutch end plate
with flat side toward the disc.
NOTE: Before installing the plates and discs, make
sure the inside of the clutch drum is free of dirt or other
foreign matter.
CLUTCH END PLATE
12. Install the snap ring
S C R E W D R I V E R
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SNAP RING