1998 HONDA CIVIC mainshaft

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S40 Model (All except'99 - 00 2-door Si' SiR)
Manual Transmission
Special Tools ..'.......... 13-2
Maintenance
Transmission Oil .............................. 13-3
Back-up Light Switch
Replacement ......... 13-3
Troubleshooting '....... 13-4
Transmission AssemblY
Removal ................. 13-5
lnstallation ............. 13-8
lllustrated Index ...............'........."........ 13-10
Transmission Housing
I Removaf .."""""""' 13-12
J R"rr"r"" Shift Holder
Clearance lnspection ....................... 13-13
Reverse ldler Gear
Removal ....'.........." 13-14
Mainshaft, Countershaft, Shift Fork
Disassembly ......'... 13-14
Mainshaft AcsemblY
Index ............... ....... 13-15
Clearance Inspection ..'.................... 13-16
Disassembly .......... 13-17
Inspection ....'......... 13-18
Reassembly ........... 13-19
Countershaft AssemblY
lndex ................ ...... 13-20
Clearance lnspection ."..........'......." 13-21
Disassembly ..."""' 13-22
Inspection .............. 13-23
Reassembly ..'.""... 13-23
Shift Fork AssemblY
lndex ............... ."'... 13-25
Clearance lnspection ."......."........'.. 13'26
MBS Shift Piece Inspection ....-.....'.. 13'27
Synchro Sleeve, Synchro Hub
f nspection/lnstallation .......'...... ".... 13'27
Synchro Ring, Gear
Inspection '....'..".... 13'28
Shift Rod
Removal .'......".""" 13'29
Differential
lndex ......."'...... .'."' 13-30
Backlash Inspection ..........."......."... 13-30
Bearing Beplacement'.............'.".... 13'31
Final Driven Gear Replacement '..... 13-31
Thrust Shim Adiustment ..."........... 13-32
Clutch Housing Bearing
Replacement .......'. 13-34
Mainshaft Thrust Shim
Adiustment '....'..".. 13-36
Transmission
Reassembly ........... 13-39
Oil Seals
Replacement ......... 13-43
Gearshift Mechanism
Overhaul ................ 13-44
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Special Tools
Ref. No. I Tool NumbetDescription(Xy I Page Reference
o
@
o.@
!'5,
@
o
@6
@
@
@(3
OTGAJ PG2O11O
OTGAJ PG2012O
07GAJ - PG20130
07736 - A010004
07746 - 0010300
07746 - 0010400
07746 - 0030100
07746 - 0030300
07746 - 0030400
07749 - 0010000
07JAD - PH80101
07JAD - PH80200
07947 - 6110501 or
07947 - 6110500
Mainshaft Holder
Co lla r
Mainshaft Base
Adjustable Bearing Puller, 25 - 40 mm
Attachment. 42 x 47 mm
Attachment,52 x 55 mm
Driver, 40 mm LD.
Attachment, 30 mm I.D.
Attachment, 3S mm LD.
Driver
Driver Attachment
Pilot. 26 x 30 mm
Seal Driver Attachment
1 13-38
1 13-37
1 I 13-37
1 13-34,35
1 13-34.35
1 13-34,35
1 | 13-19,24
31,32
1 13-19,24
1 13-19,24
r I t3-34,35, 43
1 13-43
1 13,43
1 I 13-43
* Must be used with commercially-available 3/8"-j6 Slide Hammer.
oaaal
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aif!
o
ly tr
IvI

Troubleshooting
Reverse Gear Noise Reduction System
Whenever the clutch pedal is depressed to shift into reverse, the mainshaft continues to rotate because of its inertia.
The resulting speed difference between mainshaft and reverse idler gear produces gear noise.
The reverse gear noise reduction system employs a cam plate which was added to the reverse shift holder. When shifting
into reverse, the sth/reverse shjft piece, connected to the shift lever, rotates the cam plate. This causes the sth synchro set
to stop the rotating mainshaft. As there is no speed difference between mainshaft and reverse idler gear, there will be less
gear norse.
NOTE: This system is not a fully-synchronized gear noise reduction system.
Therefore, you may hear gear noise when
O you shift into reverse with the vehicle not yet completely stopped.
@ you shift quickly into reverse during fast idling.
-
Gear noise is oresent when shift-ing into reverce after the engineis started.
Test-drive the vehicle.
ls the gear noise present whenshifting into 5th gear?Beplace the 5th synchro hub and3leeve e3 a set,
Measure the clearance between5th shift fork and 5th synchrosleeve {see page 13'26).
ls the clearance 1.0 mm (0.04
in) or less?
Measure the MBS shift piece pin(see page 13-27).
ls ( 6.8 mm (0.27 in) or more?Replace the MBS shift piece.
ReDlace the reve6e ahift hold.r.
13-4

Transmission Assembly
Removal(cont'd)
17. Remove the three upper transmission mounting
bolts and the lower starter mounting bolt,
STARTERMOUNTINGBOLT10 x 1.25 mm44 N.m (4.5 kgf.m,33 rbnftl
TRANSMISSIONMOUI{TING EOLTS12 x 1.25 mm& N.m (6.5 kgt'm,47 lbl.ftl
18. Remove the rear mount bracket bolts and transmis-
sion mounting bolts.
12 x 1.25 mm64 N.ft 16.5 kgl.m,47 lbl.ftl
SPECIAL BOLTReplace.'ll x 1.5 mm84 N.m (8.5 kgf.m, 61 lbf.ftl
SPECIAL BOLTReplace.14 x 1,5 mln84 N.m (8.5 kgl.m, 61
WASI{ERREARMOUNTBRACKET
rbl.ftt
Pull the transmission away from the engine until it
clears the mainshaft. then lower it on the transmis-
sion jack.
CAUTION: Take caro not to b6nd tho clutch lin€.
1(|
Installation
Install the transmission assembly in the reverse order of
removal.
Before installing, check that the two dowel pins are
installed in the clutch housing.
When installing the starter cable, make sure that the
crimped side of the ring terminal is facing out (see
section 23).
Apply grease to the parts as shown, then install the
release fork and release bearing,
NOTE: Use only Super High Temp Urea Grease
(P/N 08798 - 9002).
RELEASE FORK BOLT12 x 1.25 mm29 N'm 13.0 kgt,m,(P/N 08798-90021
22 tbl.ttlR€LEASEBEARING
J
RELEASEFORK8()07
ra
{PiN 08798-9002)
tP/N 08798-900210.3-0.9 g
10.01-0.03 ozl

Torque Value
A - 15 N.m (1.5 kgf.m, 1'1 lbf.ft)
B - 27 N.m (2.8 kgf.m. 20 lbift)
C - 31 N.m {3.2 kgnm, 23 lbift)
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O BALL BEARING (*T)
ANGULAR
BALL BEARING {*2I
O 5TH SYNCHRO HUB
O 5TH SYNCHRO SLEEVE
€) SYNCHRO SPRING
o SYNCHRO B|NG
@ 5TH GEAR
@ gz xgt x 23.5 mm
NEEDLE BEARING
@ SPACER COLLAR
@34x39x23mm
NEEDLE BEARING
(D 4TH GEAR
O SYNCHRO RING
C) SYNCHRO SPRING
CO 3RD/4TH SYNCHRO SLEEVE
@ 3RD/4TH SYNCHRO HUB
(} 3RD GEAR
@34x39x27.5mmNEEDLE BEARING
G) MAINSHAFT
G) WASHER
@ SPRING WASHER
@ BALL BEARING
Check for wear and
operation.(E 26x42x7 mm OIL SEAL
Replace.
@ 28 mm PLUG BOLT
5,1 N.m {5.5 kgf'm, /t0 lbt'ft)
@ lsT/zND SELECT SPRING
L. 36.26 mm (1./P8 in)
@ SHIFT ARM SHAFT
@ CLUTCH HOUSING
@ INTEELOCK GUIDE BOLT
39 N.m (4.0 kgf.m, 29 lbf.ftl
@ REVERSE SHIFT HOLDER
@ REVERSE IDLER GEAR
@ REVERSE IDLER GEAR SHAFT
@ 5 x 22 mm SPRING PIN
Replace.
@ 3RD/4TH SHIFT PIECE
@ 5TH/REVERSE SHIFT PIECE
@ MBS SHIFT PIECE
@ 1ST/2ND SHIFI FORK
*1:D16Y7 engine*2: D16Y5, D16Y8 engines
@ 3RD//|TH SHIFT FORK
@ 5TH/REVERSE SHIFT FORK
@ 52 mm SNAP RING
@ 65 mm THRUST SHIM (*11
70 mm THRUST SHIM (*21
Selection, page 13-36
@ OIL GUIDE PLATE
@ wASHER Replace.
@ BACK.UP LIGHT SWITCH
25 N.m (2.5 kgf'm, 18 lbf'ft)
@ sET SCREW
22 N.m {2.2 kgf.m, 16 lbl.ft}
@ WASHER Replace.
@D SPRING 1.31.6 mm (1.2,1inl
@ STEEL BALL 15/16 in)
@ BACK-UP LIGHT
SWITCH HARNESS BRACKET
@ TRANSMISSION HANGER
@ 32 MM SEALING BOLT
25 N.m (2.5 kgf.m, 18 lbt'ft)
@ OIL SEAL
Replace.
@ OIL DRAIN PLUG
39 N.m (4.0 kgf.m, 29 lbf.ft)
@ WASHER Replace.
@} OIL FILLER PLUG
44 N.m (4.5 kgf.m, 33 lbf'ftl
@ WASHER Replace.
@) TRANSMISSION HOUSING
€) CLUTCH LINE BRACKET
@ OIL GUTTER PLATE
@ REVERSE LOCK CAM
@ REVEBSE SELECT SPRING
L. 63.4 mm {2.,196 in)
@ REVERSE SELECT RETAINER
@ SHIFT ARM C
@ SHIFT ARM B
@ INTERLoCK
@ COLLAR
@ SHIFT ARM A
@ SPRING WASHER
@ MAGNET
@ sET BALL SPRING BOLT
22 N.m (2.2 kgf.m, 16 lbf.ftl
@ 14 x 20 mm DOWEL PIN
@ 72 mm THRUST SHIM l*11
80 mm THRUST SHIM (*21
Selection, page '13-33
@ DIFFERENTIAL ASSEMBLY
See page 13-30
@ 14 x 25 x 17.5 mm OIL SEAL
Replace.
@ 35 x 56 x 8 mm OIL SEAL
Replace.
@ SHIFT ROD
@ BOOr
@ OIL GUIDE PLATE
@30x47x21 mm
NEEDLE BEARING (* 1}
30x55x21 mm
NEEDLE BEARING {'2)
@ COUNTERSHAFT
@36x41 x 25.5 mm
NEEDLE BEARING
Check for wear and
operatron.
@ lsT GEAR
@ FRICTION DAMPER
@ SYNCHRO RING
@ SYNCHRO SPRTNG
@ lST/2ND SYNCHRO HUB
@ REVERSE GEAR
@ SYNCHRO SPRING
@ SYNCHRO RING
@ FRICTION DAMPER
@ SPACER
@39x4lx27mm
NEEDLE BEARING
@ 2ND GEAR
@ 3RD GEAR
@ 4TH GEAR
@ sTH GEAR
@) BALL BEARING {* 1}
NEEDLE BEARING (*2}
@ BALL BEARING
@) SPRING WASHER
@ LoCKNUT Replace.
108 - 0- 108 N.m
ftt.o* o- 1r.o kst.m,l
179.6- 0- 79.6 rbtft I

13-1 1

Transmission Housing
Removal
NOTE: Place the clutch housing on two pieces of wood
thick enough to keep the mainshaft from hitting the
workbench.
1. Remove the back-up light switch.
2. Remove transmission hanger.
TRANSMISSIONHANGER
BACK-UP LIGHT SWITCH
Remove the setting screws. washers. springs, and
steel balls.
STEEL BALLSO. 5/16 in
SPRINGL. 31.6 mm I 1.24 inl
13-12
SETTING SCREW
TRANSMISSION HOUSING
6.
4.Loosen the transmission housing attaching bolts in
a crisscross pattern in several steps, then remove
them.
Remove the 32 mm sealing bolt.
Expand the snap ring on the countershaft ball bear-
ing, and remove it from the groove using a pair of
snap ring pliers.
32 mm SEALING EOLT
Separate the transmission housing from the clutch
housing, and wipe it clean of the sealant.
Remove the thrust shim, oil guide plate. and oil gut-
ter plate from the transmission housing.
(o
7.
otLGUTTERTE
SNAP RING

Reverse ldler Gear
Mainshaft, Cou ntershaft,
Shift Fork
Removal
1. Remove the reverse shift holder.
REVERSE SHIFTHOLOER
Remove the reverse id ler
idler gear.
gear shaft and reverse
REVERSE IDLERGEAR SHAFT
13-14
Disassembly
1. Remove the interlock guide bolt from under the
clutch housing.
SHIFT ARM 8ATTACHING BOLT
CLUTCHHOUSING
INTERLOCK GUIDE BOLT
Remove the shift arm B attaching bolt.
Remove the mainshaft and countershaft assemblies
with the shift fork from the clutch housinq.
NOTE: Before removing the mainshaft and counter-
shaft assemblies, tape the mainshaft splines to pro-
tect the seal.
Tape the mainshaftsplines.
WASHER
SPRINGWASHER

Mainshaft Assembly
I
lndex
Note the following during reassembly:
. The 3rd/4th and sth svnchro hubs are installed with a press
. Install the angular ball bearing with the thin-edge outer race facing the sth synchro hub
. Install the ball bearing with the ball cage facing up
prior to reassembling, clean all the parts in solvent, dry them and apply lubricant to all contact surfaces the 3rd/4th
and sth svnchro hubs.
Ballcage faces uP.
Thin edge of outerrace laces down.
3RD/4TH SYNCHRO SLEEVE
page 13'27
SYNCHRO SPRINGSYNCHRO RINGInspection,page 13-28
BALL BEARING {*1)ANGULAR BALL BEARING ('2)
Check for wear and operataon.Note the direction ot installation
5TH SYNCHROSLEEVElnspection, page 13-27
SYNCHRO HUB
SYNCHRO RINGInspection, pase 13 28
sTH GEARInspection, page 13-17
3RD GEARlnspection, page 1 3-1 6
34 x 39 x 27.5 mmNEEDLE BEARINGCheck for wearano opetaflon,
MAINSHAFTInspection, page 13-18
CHAMFEB
32 x 37 x 23.5 mmNEEDLE BEARINGCheck for wear andoperation.SPACER COLLABInspection, page 1316
34x39x23mmNEEDLE EEARINGCheck for wearand operation,
4TH GEARrnspeclron,
*1: D16Y7 engine*2: D16Y5, D16Y8 engines
page 13'16RINGInspectaon, page 13 28
SPRING
13-15