1997 ACURA NSX Service Repair Manual

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

Countershaft Assembly

Inspection

1. Inspect the gear surfaces and bearing surfaces for

wear and damage, then measure the countershaft

at points A and B inspect oil passages for clogging.

If any part of the countershaft is less than the ser-

vice limit, replace it with a new one.

2. Support the countershaft at both ends, and inspect

for runout.

If the runout exceeds the service limit, replace the

countershaft with a new one.ProCarManuals.com

Countershaft 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 , 4th , 5t h an d 6t h gears on th e counter -
shaf t withou t lubrication .
• Whe n installin g th e 3rd , 4th , 5t h an d 6t h gears , sup -
por t th e shaf t o n stee l blocks , an d instal l th e gear s
usin g a press .
• Instal l th e 3rd , 4th , 5t h an d 6t h gears with a maxi -
mu m pressur e o f 1,00 0 k g (2,20 5 Ibs) , the n pres s al l
thre e gear s wit h a pressur e o f 2,60 0 k g (5,73 2 Ibs) .
NOTE : T o reassemble , se e pag e 13-37 .
1 . Suppor t th e countershaf t o n a stee l block , an d
instal l 3r d gea r usin g a press .
2. Instal l 4t h gea r usin g a press .
ProCarManuals.com

5. Install the needle bearing using a press then install

the bearing outer race.

8. Install the spring washer, tighten the locknut, then

stake the locknut tab into the groove.

NOTE: The locknut has left-hand threads.
6. Install the ball bearing using a press.

7. Securely clamp the countershaft assembly in a

bench vise with wood blocks.
3. Install 5th gear using a press.

4. Install 6th gear using a press.ProCarManuals.com

Synchro Sleeve, Synchro Hub

Inspection

1. Inspect gear teeth on all synchro hubs and synchro

sleeves for rounded off corners, which indicates

wear.

2. Install each synchro hub in its mating synchro

sleeve, and check for freedom of movement.

If replacement is required, always replace the syn-

chro sleeve and synchro hub as a set.
Installation

Each synchro sleeve has three sets of longer teeth (120

degrees apart) that must be matched with the three

sets of deeper grooves in the synchro hub when

assembled.

Installing the synchro sleeve with its longer teeth in the

synchro hub slots will damage the spring ring.ProCarManuals.com

If the clearance is less than the service limit, replace

the synchro ring and synchro cone.
Synchro Ring, Gear

Inspection

1. Inspection the synchro ring and gear.

A : Inspect the inside of the synchro ring for wear.

B : Inspect the synchro sleeve teeth and matching

teeth on the synchro ring for wear (rounded off).

C : Inspect the synchro sleeve teeth and matching

teeth on the gear for wear (rounded off).

D : Inspect the gear hub thrust surface for wear.

E : Inspect the cone surface for wear and rough-

ness.

F : Inspect the teeth on all gears for uneven wear,

scoring, gaining, and cracks.

2. Coat the cone surface of the gear with oil, and place

the synchro ring on the matching gear. Rotate the

synchro ring, making sure that it does not slip.

Measure the clearance between the synchro ring

and gear all the way around. Hold the synchro ring

against the gear evenly while measuring the clear-

ance.ProCarManuals.com

Oil Pump

Disassembly/Reassembly

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