Cylinder Construction; Cylinder Disassembly; Cylinder Inspection - Honda CB450 1968 Service Manual

32
Fig . 3 . 51 Cylinder construction
G)
Cylinder sleeve
®
0
ring
Fig.
3. 52
Cylinder inner diameter measuring
G)
Cylinder gouge
®
Cylinder
Fig. 3.
53
(D
Vertical
©
Middle
®
Horizontal
®
Lower
(! ~ !~
~
Q)
. I
I .
fig. 3 • .54
0F·
Cylinde~ridge
:t·4
:,.
~
~
3. ENG I NE
@.
Upper
Q.
Cylinder Construction
The cylinder sleeve is made of special steel alloy
and is press fitted into the cast aluminum body.
A compartment is provided between the cylinder
barrels to accomodate the cam chain and tensioner.
There are two cylinder studs w hich are hollow and
serves as an oil passagew ay. An O ring is installed
on the sleeve skirt to prevent gas leaks.
(Fig. 3.
51)
R. Cylinder Disassembly
Remove the cylinder head in accordance with
Section 3.2 B.
S. Cylinder Inspection
Measure the cylinder bore, taper and out-of-
round w ith a precision cylinder gauge. Take
measurements at the top, middle and bottom in
both diametrical axes.
(Fig. 3. 52, 53}
Item
I
Stand ard value Serviceable limit
70 .0-70 .01
mm
Boring necessary
Cylin der barre l
12.7 56-2 .7 564
in!
when over
70.11 mm 12.7 6 !nl
Cylinder Less than
Boring necessary
when over
out-of-round
0.005
mm
10.0002
in)
0.05
mm
10.002
inl
. I
Less than
Boring necessary
Cylinder taper
0.005
mm
10.0002
in) when over
0.05
mm
I0.002
in)
NOTE:
a. After reboring the cy linder, finish honing must
be performed to provide l
s~
l
.5
S surface
finish. The permissible stock removal during
the honing operation is approximately 0.01 mm
(0. 0004 inl. The cyligper sleeves are available
in oversize up to l mm
!O.
040 in) in 0. 25 mm
(0.010 inl oversizes increments. Cylinders re-
quiring reboring beyond 1.0mm (0.040inl should
be replaced with a new cylinder sleeve.
b. When only the piston is to be replaced without
the cylin der, the cylinder ridge should be
removed with a ridge reamer. (Fig. 3. 54)