ACURA NSX 1997 Service Repair Manual
Page 691 of 1503
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
Page 692 of 1503
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
Page 693 of 1503
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
Page 694 of 1503
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
Page 695 of 1503
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
Page 696 of 1503
Oil Pump
Disassembly/Reassembly
Prior to reassembling, clean all the parts in solvent, dry them, and apply lubricant to any contact surfaces.ProCarManuals.com
Page 697 of 1503
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
Page 698 of 1503
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 .
ProCarManuals.com
Page 699 of 1503
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 .
ProCarManuals.com
Page 700 of 1503
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