Description
Clutches (cont’d)
The Acura four speed automatic transmission uses hydraulically actuated clutches to engage or disengage the transmission
gears. When clutch pressure is introduced into the clutch drum, the clutch piston is applied. This presses the friction
discs and steel plates together, locking them so they don’t slip. Power is then transmitted through the engaged clutch
pack to its hub-mounted gear.
Likewise, when clutch pressure is bled from the clutch pack, the piston releases the friction discs and steel plates, and
they are free to slide past each other while disengaged. This allows the gear to spin independently of its shaft, transmitting
no power.
[I st Clutch1
The first clutch engages/disengages first gear, and is located at the end of the mainshaft, just behind the end cover.
The first clutch is supplied clutch pressure by its oil feed pipe within the mainshaft.
[I
Clutch]
The first hold clutch engages/disengages low hold or 1 position, and is located at the end of the countershaft, just behind
the end cover. The 1st hold clutch is supplied clutch pressure by its oil feed pipe within the countershaft.
Clutch1
The second clutch engages/disengages second gear, and is located on the secondary shaft. The second clutch is supplied
clutch pressure through the secondary shaft by a circuit connected to the 2nd accumulator body.
Clutch1
The third clutch engages/disengages third gear, and is located at the end of the countershaft, opposite the end cover
The third clutch is supplied clutch pressure by its oil feed pipe within the countershaft.
Clutch]
The fourth clutch engages/disengages fourth gear, as well as reverse gear, and is located at the center of the mainshaft.
The fourth clutch is supplied clutch pressure by its oil feed pipe within the mainshaft.
[One-way Clutch1
The one-way clutch is positioned between the parking gear and first gear, with the parking gear splined to the countershaft.
The first gear provides the outer race surface, and the parking gear provides the inner race surface. The one-way clutch
locks up when power is transmitted from the mainshaft first gear to the countershaft first gear.
The first clutch and gears remain engaged in the 1 st,
and 4th gear ranges in the
q
position. However, the
one-way clutch disengages when the
or 4th clutches/gears are applied in the
position. This is because the
increased rotational speed of the gears on the countershaft over-ride the locking “speed range” of the one-way clutch.
Thereafter, the one-way clutch freewheels with the first clutch still engaged.
COUNTERSHAFT
GEAR
L O C K S
FREE
PARKING GEAR
Summary of Contents for Acura NSX 1991
Page 1: ... j s _ _ ...
Page 3: ......
Page 22: ...Special Tools Individual tool lists are located at the front of each section ...
Page 23: ...Specifications Standards and Service Limits 3 2 Design Specifications 3 l 1 ...
Page 39: ...Body Specifications m I 1 175 46 3 Unit mm in ...
Page 40: ...Maintenance Lubrication Points 4 2 Maintenance Schedule 4 4 ...
Page 42: ... 13 I 0 4 3 ...
Page 60: ...Engine Removal Installation ...
Page 81: ...lr I 6 7 ...
Page 191: ... n EilEli3 A A A Cl51 c4 BLU 1 TACHO METER CONNECTOR Cl61 C478 C488 REDlYEL YELlRED J A GlOl ...
Page 193: ... PGM FI 1 IDLE CONTROL 1 FUEL SUPPLY 1 EMISSION CONTROL II 17 ...
Page 207: ...II 31 ...
Page 211: ...I I 35 ...
Page 219: ... cont d II 43 ...
Page 235: ...1 l 59 ...
Page 255: ...11 79 ...
Page 285: ...1 l 109 ...
Page 434: ...t 14 46 ...
Page 477: ...14 95 ...
Page 482: ...Illustrated Index L Side Cover 14 100 ...
Page 484: ...Illustrated Index Transmission Housing 14 102 ...
Page 486: ...Illustrated Index Torque Converter Housing Valve Body ...
Page 527: ...3 Assemble the transmission in the following numbered sequence Replace cont dl ...
Page 551: ......
Page 698: ...9 Nom 0 9 kg m 7 lb ft REAR 9 Nom 0 9 kg m 7 lb ft ...
Page 724: ...19 37 ...
Page 766: ...19 79 ...
Page 888: ...Frame Repair Chart 20 62 ...
Page 893: ...22 5 ...
Page 937: ...22 49 ...
Page 950: ...Blower 22 62 ...
Page 971: ...22 83 ...
Page 1003: ... JND WIRE EN NE GROUND WIRE B ...
Page 1005: ... lzl A ENGINE W I R E H A R N E S S cont d 23 l 9 ...
Page 1007: ... rl p173 5 Cl34 Cl32 Ti03 23 21 ...
Page 1009: ...C2bl c262 I C203 cont d 23 23 ...
Page 1011: ... rl SUB RELAY BOX A cont d 23 25 ...
Page 1013: ...FRONT COMPAR 23 27 J ...
Page 1015: ...e RIGHT RETRACTOR SUB HARNESS I LEFT RETRACTOR SUB HARNESS I ...
Page 1019: ...C466 C465 C468 C464 c473 FLOOR WlFiE HARNESS co d 23 33 ...
Page 1021: ... ITI RETRACTABLE HEADLIGHT CONTROL UNIT i FLOOR WIRE HARNESS 23 35 ...
Page 1023: ...MAIN FUSE BOX I 23 37 ...
Page 1027: ...DRIVER S DOOR WIRE HARNESS PASSENGER S DOOR WIRE 23 41 ...
Page 1029: ...SRS CONTROL UN FUEL TANK WIRES 23 43 ...
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Page 1275: ...1 ACTUATOR ASSEMBLY SPEED SENSOR 23 l 33 ...
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