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Tractors,
Lawn
and
Garden
-
110
and
112
Engine
20
SM-2059-
(Apr-57)
Piston,
Cr
ankshaft
and
Flywheel
-
Tecumseh
35-9
--------~~-------------------------------------------
Fig.
20-0iogonol
Piston
Wear
Pattern
Caused
by
Bent
or
Twisted
Connecting
kod
Check
rod
and
piston
alignment
when
a
piston
shows
a
diagonal
wear
pattern
extending
across
the
skirt
of
the
piston.
Contact
with
cylinder
wall
shows
on
bottom
of
skirt
at
left
and
ring
lands
on
the
right.
A
cylinder
bored
at
an
angle
to
the
crank-
shaft
could
also
cause
improper
ring
contact
with
the
cylinder
wall.
This
condition
can
cause:
1.
Rapid
piston
wear.
2.
Uneven
piston
wear.
3.
Excessive
oil
consumption.
Fig.
2T-Piston
Damage
Caused
by
Pin
Lock
Coming
Loose
In
the
above
illustration
a
piece
of
the
lock
found
its
way
into
the
oil
ring.
Pin
locks
loosen
or
break
due
to:
1.
Rod
misalignment.
2.
Excessive
crankshaft
end
play.
3.
Crank
pin
taper.
4.
Weak
pin
locks.
5.
Pin
locks
incorrectly
installed.
Inertia
can
cause
a
lock
or
loose
object
in-
side
the
piston
pin
to
beat
out
the
piston
and
cylinder
in
the
pin
boss
area.
Damage
to
both
piston
and
cylinder
occurs.
Litho
in
U.S.A.