Filter
Top Products
20
Engine
Tractors,
Lawn
and
Garden
-
110
and
112
35-6
Piston,
Crankshaft
and
Flywheel
-
Tecumseh
SM-
2059-(Apr-67)
Fig.
12-Scratched
Ring
Faces
Caused
by
Abrasives
in
the
Engine
Vertical
scratches
across
the
faces
of
piston
rings
are
the
result
of
an
abrasive
entering
the
engine.
Abrasives
may
be
airborne,
may
have
been
left
in
during
overhaul
or
are
loose
lead
and
carbon
deposits.
When
this
condition
is
found,
alwa
y s che
ck
and
correct
the
source
of
abrasives
because
the
life
of
a
new
set
of
rings
will
be
short
otherwise.
Common
causes
for
abrasives
in
the
engine
are:
1.
Damaged,
collapsed
or
improperly
in-
stalled
air
filter.
2.
Loose
connection
or
damaged
gasket
between
air
filter
and
carburetor.
3.
Air
leak
around
carburetor
to
block
g·asket.
4.
Air
leakage
around
throttle
shaft.
5.
Failure
to
properly
clean
cylinder
bore.
'1
•
Fig.
13-W
orn
Oil
Rings
Which
Cannot
Provide
Oil
Control
Ra
ils
of
the
oil
rin
g
ar
e
worn
down
to
the
st
eel
expand
e r s pac r and
the
oil
r ing S
urf
a e
is
worn
flat.
T h
is
can
on
ly c
ome
fro
m
cy
lin
d
er
wa
ll
contact
after
much
use
and
possible
ent
ry
of
abrasives.
Comp
re
ssion
ri
ng
s
will
al
so
be
worn
thin.
Badly
worn
oil
rings
will
have:
1.
Extra
lar
ge
g
ap.
2.
Low
t e
ns
i
on.
INSPECTING
PIS
T ON
Fig.
14-
C
leaning
Ring
Grooves
Remove
deposits
from
piston
surfaces.
Clean
gum
and
varnish
from
the
piston
skirt.
Do not use a caustic cleaning solution
or
a
wire
brush
to
clean pistons.
Litho
in
U.S.A.