ACURA NSX 1997 Service Repair Manual

Shift Fork Assembly

Disassembly/Reassembly

NOTE: Install the spring pins so their grooves are 180° apart.

Prior to reassembling, clean all the parts in solvent, dry them, and apply lubricant to any contact surfaces.

Disassembly: Remove the 3 mm spring pin and 5 mm spring pin.

Reassembly: Install the 5 mm spring pin first, then install the 3 mm spring pin.ProCarManuals.com

Mainshaft Assembl y
Index
NOTE : Th e 3rd/4t h an d 5th/6t h synchr o hub s ar e installe d wit h a press .
Prio r t o reassembling , clea n al l th e part s i n solvent , dr y them , an d appl y lubrican t t o an y contac t surfaces .
Th e 3rd/4t h an d 5th/6t h synchr o hubs , however , shoul d b e installe d wit h a pres s befor e lubricatin g them .
OUTE R SYNCHR O RIN GInspection , pag e 13-4 1
3RD/4T H SYNCHR O SLEEV E
Inspection , pag e 13-4 0
OUTE R SYNCHR O RIN G
Inspection , pag e 13-4 1
3RD GEARMeasurement , pag e 13-3 0
MAINSHAF T
Inspection , pag e 13-3 3
4TH GEA RMeasurement , pag e 13-3 0
SPACE R COLLA R'Inspection , pag e 13-30 , 13-3 1
5TH GEA RMeasurement , pag e 13-3 1
SYNCHR
O RIN G
Inspection , pag e 13-4 1
5TH/6T
H SYNCHR O SLEEV E
Inspection , pag e 13-4 0
SYNCHR
O RIN G
Inspection , pag e 13-4 1
6TH GEA RInspection , pag e 13-3 1
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Mainshaft Assembly

Clearance Inspection

1. Measure the clearance between 2nd and 3rd gears.

Standard: 0.06 - 0.19 mm

(0.002 - 0.007 in)

Service Limit: 0.3 mm (0.012 in)
3. Measure the clearance between 4th gear and the

spacer collar.

Standard: 0.06 - 0.19 mm

(0.002 - 0.007 in)

Service Limit: 0.3 mm (0.012 in)

2. If the
clearance exceeds
the
service
limit,
measure

the thickness of 3rd gear.

If the
thickness
of 3rd
gear
is
less than
the
service
limit,

replace 3rd gear with a new one.

If the thickness of 3rd gear is within the service limit,

replace the 3rd/4th synchro hub with a new one.
If the thickness of 4th gear is less than the service

limit, replace 4th gear with a new one.

If the thickness of 4th gear is within the service

limit, replace the 3rd/4th synchro hub with a new

one.
4. If the clearance exceeds the service limit, measure

on the spacer collar.

5. If is
less than
the
service
limit,
replace

the spacer collar with a new one.

If is within the service limit, measure

the thickness of 4th gear.ProCarManuals.com

6. Measure the clearance between the spacer collar

and 5th gear.
9. Measure the clearance between the distance collar

and 6th gear.

10. If the clearance exceeds the service limit, measure

on the distance collar.

11. If is less than the service limit, replace

the distance collar with a new one.

If is within the service limit, measure

thickness of 5th gear.

If the thickness of 6th gear is less than the service

limit, replace 6th gear with a new one.

If the thickness of 6th gear is within the service limit,

replace the 5th/6th synchro hub with a new one.
If the thickness of 5th gear is less than the service

limit, replace 5th gear with a new one.

If the thickness of 5th gear is within the service limit,

replace the 5th/6th synchro hub with a new one.
8. If is less than the service limit, replace

the spacer collar with a new one.

If is within the service limit, measure

thickness of 5th gear.
7. If the clearance exceeds the service limit, measure

on the spacer collar.ProCarManuals.com

Mainshaft Assembly

Disassembly

1. Support ball bearing on steel blocks as shown, and

press the shaft out of the ball bearing. Use of a jaw-

type puller can damage the gear teeth.
3. Support 5th gear on steel blocks as shown, and

press the shaft out of the 5th/6th synchro hub.

4. In the same manner as above, support the 3rd gear

on steel blocks, and press the shaft out of the 3rd/4th

synchro hub.
2. Support 6th gear on steel blocks as shown, and

press the shaft out of the ball bearing.ProCarManuals.com

If an y par t o f th e mainshaf t i s les s tha n th e servic e
limit , replac e th e mainshaf t wit h a ne w one . I
f th e runou t exceed s th e servic e limit , replac e
the mainshaf t wit h a ne w one .
Inspectio n
1. Inspec t th e gea r surfac e an d bearin g surfac e fo r
wea r an d damage , the n measur e th e mainshaf t a t
point s A , B , an d C . 2
. Suppor t th e mainshaf t a t bot h ends , an d inspec t fo r
runout .
Mainshaft Assembly
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Mainshaft Assembl y
Reassembl y
CAUTION:
• Prio r t o reassembling , clea n al l th e part s i n solvent ,
dr y them , an d appl y lubrican t t o an y contac t parts .
• Pres s th e 3rd/4t h an d 5th/6t h synchr o hub s o n th e
mainshaf t withou t lubrication .
• Whe n installin g th e 3rd/4t h an d 5th/6t h synchr o
hubs , suppor t th e shaf t o n stee l blocks , an d instal l
th e synchr o hub s usin g a press .
• Instal l th e 3rd/4t h an d 5th/6t h synchr o hub s wit h a
maximu m pressur e o f 1,00 0 k g (2,20 5 Ibs) , the n pres s
bot h th e 3rd/4t h an d 5th/6t h synchr o hub s wit h a
pressur e o f 2,00 0 k g (4,40 9 Ibs) .
• Th e clutc h housin g bal l bearin g i s installe d whe n it' s
tim e t o chec k th e mainshaf t clearances .
NOTE : T o reassemble , se e pag e 13-31 .
1 . Suppor t 2n d gea r o n stee l blocks , the n instal l th e
3rd/4t h synchr o hu b usin g a press .
2 . Instal l th e 3rd/4t h synchr o sleev e b y alignin g th e
stop s o n th e 3rd/4t h synchr o sleev e an d hub . Afte r
installing , chec k th e operatio n o f th e 3rd/4t h syn -
chr o hu b set . 3
. Instal l th e 5th/6t h synchr o hu b usin g a press .
4 . Instal l th e transmissio n housin g sid e bal l bearin g
wit h th e tapere d en d facin g dow n usin g a press .
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OUTER SYNCHR O RIN G
Inspection , pag e 13-4 1
SPACE R COLLA RSelection , pag e 13-3 6
1ST/2N D SYNCHR O SLEEV E
Inspection , pag e 13-4 0
COUNTERSHAF T.Inspection, pag e 13-3 8
THRUS T WASHE RSelection , pag e 13-3 6
OUTE
R SYNCHR O RIN G
Inspection , pag e 13-4 1
Countershaf t Assembl y
Index
NOTE : Th e 3rd , 4th , 5t h an d 6t h gear s ar e installe d wit h a press .
Prior t o reassembling , clea n al l th e part s in solvent , dr y them , an d appl y lubrican t t o an y contac t surfaces .The 3rd , 4th , 5t h an d 6t h gear s shoul d b e installe d withou t lubricatio n usin g a press .
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Countershaft Assembly

Clearance Inspection

1. Measure the clearance between 2nd and 3rd gear.
3. Measure the clearance between 1st and reverse

gear.

Standard: 0.04 - 0.10 mm (0.002 - 0.004 in)

4. If the clearance exceeds the standard, select the

appropriate thrust washer for the correct clearance

from the chart below.
2. If the clearance exceeds the standard, select the

appropriate spacer collar for the correct clearance

from the chart below.ProCarManuals.com

Disassembly

NOTE: Remove the gears using a press and steel blocks.

Use of a jaw-type puller can damage the gear teeth.

1. Securely clamp the countershaft assembly in a

bench vise with wood blocks.
4. Support 4th gear on steel blocks, and press the

shaft out of 5th and 4th gears.

5. Support 2nd gear on steel blocks, and press the

shaft out of 3rd and 2nd gears.

2. Raise the locknut tab from the groove of the counter-

shaft, and remove the locknut and the spring wash-

er.

NOTE: The locknut has left-hand threads.

3. Support 6th gear on steel blocks, and press the

shaft out of ball bearing, needle bearing, and 6th

gear.ProCarManuals.com