Motobecane 40 - Disassembling the Engine

D I SASSEMBL
I NG
THE
ENG I NE
Engine removed.
Remove
the exhaust
usinq 10mm and 1lmm
sockets to loosen exhaust
clamp
and
a 32mm open wrench
to
loosen
the nut
connecting
the exhaust to
the
cyl
i nder.
Set
the engine
jn
a vice
by inserting
a
spacer
between the lower
enqine
mount
plates
so
that the assembly
may be firmly
clamped
(fjg.2).
Remove belt
cover usinq
a screwdriver for
variator
engines or
a LOmm
socket
for
Dimoby
clutch
eng'ines.
Remove
the flywheel magneto
(See
page
28).
Remove
the variator
or the clutch assembly
according
to the
type of
machjne serviced
(See
pages
38 and 43).
Progressive'ly
loosen
the
cy1
inder
head nuts at
opposite
corners.
Remove
the
cylinder head and the
qasket
(tOmm
socket).
Remove
the cyljnder and
cylinder
base
gasket.
N0TE
:
After
Ju1y, 1975
,
our
eng.ines are
f
j
tted wi th
pi
stons
havi nq LEVELLED
UP RINGS WHICH
COVER THE L0CATING
PINS
(fig.
1).
l^Jithdraw the
piston
rings.
Stuff
a
rag into
the crankcase
mouth and
remove the
wrist
pin
c'l
'ips
using
flat
nose
p1
iers
(fig.
2).
Dri
ve out the
p.iston p
j
n
usi
ng
the
pi
n extractor
tool
,
100025,
(f
j
g.
3) .
New-sty1
e
P.i
s
ton
Fig.
1
0l
d-sty
Piston
le
!
{
I
k
Fjg. 3
RO
12
Fi
g.
mike
butkus
Digitally signed by mike
butkus
DN: cn=mike butkus,
o=orphancameras,
ou=29,
email=mike@butkus.org,
c=US
Date: 2018.03.02 16:02:07
-05'00'