Transmission Disassembly - Honda CB450 1968 Service Manual

3. 5 UPPER AN D LOW ER CRANKCASE
53
TOP GEAR:
(Fig. 3 . 109 F)
The fr ee rotat ing main shaft fifth gear (M
51
receives it drive power by being er.gaged to M 2
M 3 gears by a dog . The pow er of the main
shaft is thus transmitt ed from M 5 to the counter-
shaft fifth gear IC 5) to dr ive the countershaft and
the dr ive sprocke t on the end.
L.
Transmission Disas se mbly
The transmission can be disassembled by sepa·
rating the upper and lower crankcase in accordance
with ti1e instructions in section 3. 5. C
M . Inspection
l. Ma in shaft, countershaft diameter (fig . 3.
110 A, 110 El )
Item
Shof.t O.D .
Standard value
!
Serviceable limit
I
19.959-l9.98mmj Replace if under
I
10.7858-0.7866 inl,l 9.94 mm I0.785 ini
' I
2.
Spline clearances M to M
2-3,
C to C 4 and
C 5 (f ig. 3. 111)
Item Standard value
!
Serviceable l imi t
I
Spline
I
0.03 - 0.096 mm
I
Replace if over
I
c learanc e ,I0.0012 - 0.0 038 inl 0.1 5 mm I0 .0059 inl
3 . Backlash (Fig. 3. 112)
Item Standard va lue
i
Serviceab le I imi t
i
' L 0.032-0.096 mm
i
Replace if over
_ ow
m.oo
13-0 0038 inl;_ 0 15 mm 10.006 inl
I ,
0.089 -0. 179 mm , Replace if over
Backlash\ 2 nd
l[0.0035-0.0071 inll 0.2 mm 10.08 inl
I
!3rd.4th,' 0.09 4- 0. 188 mm
!
Replace if over
. Top 1 1 0.0037-0.0074 inil 0.2 l mmt0.0082 inl
4. Main shaft, counter shaft bearing inside diam-
eter
Item
Bearing I.D.
Standar d value : Serviceab le limit
I
I - -- - - - ---- ··--- ·- ·- - ----
t 20 .02 -2 0.033 mm .
1
Replace i f over
!10.7882 -0.7887 inl 20.06 mml0.789 inl \
5. C l g,gar bore
Item
Standard value
Serviceable limit
Bore Dia.
I 2 0.0-20. 021 mrn Replace if over
i0.787 4- 0.7882 inli20.05 mm l0 .789 inl
- - - ---- ------ --- -- - -- -
Fig. 3. J09F Top
Fig. 3. 110 A
(D
Main shaf t outside diameter
Q)
Fig. 3. I JOB
(D
Counter shaft outside d iameter
Fi g . 3. 111 Measuring spline clearance
I
i
_J
Q)
· I