1991 ACURA NSX Service Repair Manual

Reassembly
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 5t h gears on th e countershaf t
withou t lubrication .
• Whe n installin g th e 3rd , 4t h an d 5t h gears , suppor 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 , 4t h an d 5t h gear s wit h a maximu m
pressur e o f 1,00 0 kg , the n pres s al l thre e gears with
a pressur e o f 2,60 0 kg .
NOTE : T o reassemble , se e pag e 13-29 .
1. Suppor t th e countershaf t o n a stee l bloc k a s shown ,
and instal l 3r d gea r usin g a press .
PRESS
3RD GEA R
2. Instal l 4t h gea r usin g a pres s a s shown .
PRESS
4TH GEA R
3. Instal l 5t h gea r usin g a pres s a s shown .
PRESS
5TH GEA R
4. Instal l th e needl e bearin g usin g a pres s a s shown ,
the n instal l th e bearin g oute r race .
PRES S
NEEDL E BEARIN G
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Countershaft Assembly

Reassembly

5. Install the ball bearing using a press as shown.

PRESS

BALL BEARING

6. Securely clamp the countershaft assembly in a

bench vise with wood blocks.

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

stake the locknut tab into the groove.

NOTE: The locknut has left-hand threads.

LOCKNUT

155 0 155 N-m

(15.5 0 15.5 kg-m, 112 0 112 Ib-ft)

SPRING WASHER

BENCH

VISE

WOOD BLOCKS
LOCKNUT

Replace.ProCarManuals.com

Synchro Ring , Gea r
Inspectio n
1. Inspec t th e synchr o rin g an d gear .
A : Inspec t th e insid e of the synchr o rin g fo r wear .
B : Inspec t th e synchr o sleev e teet h an d matchin g
teet h o n th e synchr o rin g fo r wea r (rounde d
off).
C : Inspec t th e synchr o sleev e teet h an d matchin g
teet h o n th e gea r fo r wea r (rounde d off) .
D : Inspec t th e gea r hu b thrus t surfac e fo r wear .
E : Inspec t th e con e surfac e fo r wea r an d
roughness .
F : Inspec t th e teet h o n al l gear s fo r uneve n wear ,
scoring , galling , an d cracks .
2. Coa t th e con e surfac e o f th e gea r wit h oil , an d plac e
the synchr o rin g o n th e matchin g gear . Rotat e th e
synchr o ring , makin g sur e tha t i t doe s no t slip .
Measur e th e clearanc e betwee n th e synchr o rin g
and gea r al l th e wa y around .
NOTE : Hol d th e synchr o rin g agains t th e gea r
evenly whil e measurin g th e clearance .
Synchro Ring-to-Gea r Clearanc e
Standard : 0.85—1. 1 m m
(0.033-0.04 3 in)
Servic e Limit : 0. 4 m m (0.01 6 in )
Doubl e Con e Synchro-to-Gea r Clearanc e
Standard :
(Oute r Synchr o Rin g to Synchr o Cone )
0.5-1.0 m m (0.020-0.03 9 in )
(Synchr o Con e t o Gear )
0.5-1.0 mm (0.020-0.03 9 in)
(Oute r Synchr o Rin g t o Gear )
0.95-1.6 8 m m (0.037-0.06 6 in )
Servic e Limit :
0.3 m m (0.01 2 in )
0.3 m m (0.01 2 in )
0.6 m m (0.02 4 in )
If th e clearanc e is les s than the servic e limit,
replac e th e synchr o rin g an d synchr o cone .
SYNCHR O SPRIN G
SYNCHR O RIN G
SYNCHR O RIN G
GEA R
SYNCHR O CON E
INNERSYNCHR ORING
OUTE R SYNCHR O RIN G
GEA R
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Synchro Sleeve , Synchr o Hu b
Inspectio n
1. Inspec t gea r teet h o n al l synchr o hub s an d synchr o
sleeve s fo r rounde d of f corners , whic h indicate s
wear.
2. Instal l eac h synchr o hu b i n it s matin g synchr o
sleeve , an d chec k fo r freedo m o f movement .
NOTE : I f replacemen t i s required , alway s replac e
th e synchr o sleev e an d synchr o hu b a s a set .
SLEEV E
HUB
Installatio n
Each synchr o sleev e ha s thre e set s o f longe r teet h (12 0
degree s apart ) tha t mus t b e matche d wit h th e thre e
sets o f deepe r groove s i n th e synchr o hu b whe n
assembled .
NOTE : Installin g th e synchr o sleev e wit h it s longe r
teet h i n th e synchr o hu b slot s wil l damag e th e sprin g
ring.
SYNCHR OHUB
LONGER TEETH
SYNCHR OHUB SLOT
SYNCHROSLEEVE
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Oil Pump

Disassembly/Reassembly

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

6 x 1.0 mm BOLT

12 N-m (1.2 kg-m, 9 Ib-ft)

STRAINER COVER

O-RING

Replace.

STRAINER SET

SPRING

OIL PUMP STRAINER

Inspect for damage and

clogging.
OIL PUMP SHAFT ASSEMBLY

6 x 1.0 mm BOLTS

12 N-m (1.2 kg-m, 9 Ib-ft)

INNER ROTOR

OUTER ROTOR

RELIEF VALVE SPRING

(L.
19.1
mm)

STEEL BALL

(5/16
in)
OIL PUMP PLATEProCarManuals.com

Oil Pump

Clearance Inspection

1. Check the clearance between the transmission

mating surface of the clutch housing and the oil

pump gear.

Standard:
0.3-0.8
mm
(0.012-0.031
in)

Service Limit: 0.9 mm (0.035 in)

2. Check the axial clearance on the pump rotor.

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)
3. Check the radial 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

housing 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)ProCarManuals.com

Countershaft Bearin g (Clutc h Housing )
Replacemen t
1. Remov e th e bearin g retainin g plate .
BEARIN G RETAININ G
PLAT E 6
x 1. 0 m m BOLT S
Replace .
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 .
3/8"-1 6SLIDE HAMME R(Commerciall yavailable)
ADJUSTABL E BEARIN G
PULLER ,
25-40 mm0773 6 - A01000 A
OIL HOL E
NEEDL E BEARIN G
OI L GUID E PLAT E
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 .
NOTE : Positio n th e needl 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 tool s a s
shown .
DRIVE R07749 - 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 i n th e groov e i n th e bearin g retainin g plate .
6 x 1. 0 m m SPECIA L BOL T
1 2 N- m (1. 2 kg-m , 9 Ib-ft )
Replace .
BEARIN G RETAININ G PLAT E
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Mainshaft Oi l Sea l (Clutc h Housing )
Replacemen t
1. Remov e th e releas e bearin g guid e cove r an d
releas e bearin g guide .
RELEAS E BEARIN G
GUID E COVE R
RELEAS E BEARIN G
GUID E
2. Remov e th e oi l seal .
OIL SEA L
Replace .
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 .
OIL SEA L
Replace .
DRIVE R
07749 - 0010000
ATTACHMENT ,52 x 5 5 m m07746 - 0010400
OI L SEA L
Replace .
4. Instal l th e releas e bearin g guid e an d releas e bearin g
guid e cover .
6 x 1. 0 m m BOLT S
1 2 N- m (1. 2 kg-m , 9 Ib-ft )
RELEAS E BEARIN G
GUID E COVE R
RELEAS E BEARIN G
GUIDE
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