Filter
Top Products
T
ractors,
Lawn
and
Garden
-
110
and
112
Engine
20
S
M-2059-(Apr-67)
Piston,
Crankshaft
and
Flywheel
-
Tecumseh
35- 7
Be
sure
the
oil
ring
holes
are
clean.
Clean
carbon
from
piston
ring
grooves
with
a
ring
groove
cleaner,
Figure
14.
If
cleaning
tool
is
not
available,
break
an
old
ring
and
use
it
to
clean
grooves.
Fig.
IS-Measuring
Ring
Clearance
, "
.
..
Check
ring
grooves
for
excessive
wear
by
inserting
a
new
ring
in
the
proper
groove
at
several
pOints
around
the
piston.
Measure
clear-
ance
between
ring
and
groove
with
a
feeler
gauge,
Figure
15.
Refer
to
"Specifications,"
page
35-18,
for
ring
groove
side
clearance.
Replace
piston
having
ring
clearance
beyond
wear
limits.
Inspect
piston
for
fractures
at
the
ring
lands,
skirts
and
ring
bosses
and
for
rough
or
scored
skirts.
Analyze
the
condition
of
the
piston
by
stud-
ying
the
illustrations
beginning
on
page
35-8.
Replace
faulty
pistons.
,' I .101,
PI'
Fig.
16-Measuring
Piston
Pi"
and
Piston
Measure
piston
pin
to
piston
clearance
with
micrometer.
Ream
out
piston
and
rod
and
install
oversize
piston
pins
when
necessary.
See
"Spec-
ifications,"
page
35-18.
Oversize
piston
pins
are
a
vailable
for
service.
.
1f
,
t'
I
Fig.
17-Mcasuring
Piston
Check
the
piston
to
cylinder
bore
clearance
by
measuring
the
piston
and
bore
diameters.
Measure
the
outside
diameter
of
the
piston
with
a
micrometer
at
the
centerline
of
the
piston
pin
bore
and
at
90
0
to
the
pin
bore
axis.
If
cylinder
to
bore
clearance
is
more
than
0.005
inch,
the
cylinder
will
have
to
be
rebored
and
oversize
piston
and
rings
installed.
Oversize
pistons
and
rings
are
available
in
0.010
inch
and
0.020
inch
sizes
for
service.
See
page
35-11
for
deglazing
and
reboring
information.
Litho
in
U.S.A.