ACURA NSX 1997 Service Repair Manual

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

Clearance Inspection

1. Check the clearance between the transmission mat-

ing surface of the clutch housing and the oil pump

gear.
3. Check the radial clearance on the pump rotor.

2. Check the axial clearance on the pump rotor.
Inner Rotor-to-Outer Rotor Radial clearance

Standard: 0.14 mm (0.006 in) max.

Service Limit: 0.2 mm (0.008 in)

4. Check the radial clearance between the clutch hous-

ing and the outer rotor.

Clutch Housing-to-Rotor Radial clearance

Standard: 0.1 - 0.2 mm

(0.004-0.008 in)

Service Limit: 0.22 mm (0.009 in)
Standard: 0.3 - 0.8 mm (0.012 - 0.031 in)

Service Limit: 0.9 mm (0.035 in)

Clutch Housing-to-Rotor Axial clearance

Standard: 0.03-0.1 mm

(0.001 - 0.004 in)

Service Limit: 0.15 mm (0.006 in)ProCarManuals.com

Mainshaft Oi l Sea l (Clutc h Housing )
Replacemen t
1. Remov e th e releas e bearin g guid e cover , an d
releas e bearin g guide . 3
. Driv e a ne w oi l sea l fro m th e clutc h sid e usin g th e
specia l tool s a s shown .
DRIVER07749-001000 0
ATTACHMENT ,52 x 5 5 m m07746-001040 0
4. Instal l th e releas e bearin g guide , an d releas e bear -
in g guid e cover .
2
. Remov e th e oi l seal .
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Countershaft Bearin g (Clutc h Housing )
Replacemen t
1. Remov e th e bearin g retainin g plate .
3. Positio n th e oi l guid e plat e an d ne w needl e bearin g
i n th e bor e o f th e clutc h housing . Positio n th e nee -
dl e bearin g wit h th e oi l hol e facin g up .
4 . Driv e th e needl e bearin g usin g th e specia l tools .
2 . Remov e th e needl e bearin g wit h th e specia l tool ,
the n remov e th e oi l guid e plate .
ADJUSTABL E BEARIN G
PULLER , 25-40 mm07736-A01000 A
DRIVER07749-001000 0ATTACHMENT , 6 2 x 68 m m07746-001050 0
5. Instal l th e bearin g retainin g plate , an d stak e th e bol t
head s in th e groov e in th e bearin g retainin g plate .
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Mainshaft Thrust Shim

Adjustment

1. Remove the thrust shim and oil guide plate from the

transmission housing.

2. Install the mainshaft in the transmission housing.

Do not install the clutch housing side ball bearing.

3. Measure between the end of the

transmission housing and mainshaft. Use a straight

edge and feeler gauge, and measure at three loca-

tions and average the readings.
5. Select the proper thrust shim on the basis of the

following calculations. Do not use more than two

thrust shims.

4. Set the mainshaft ball bearing in the clutch hous-

ing, and measure distance between the sur-

faces of the clutch housing and the bearing in-

ner race. Use a straight edge and feeler gauge, and

measure at three locations and average the read-

ings. Do not install the spring washer.ProCarManuals.com