Tecumseh HH100 Handbook page 36

FEELER GAUGE
INVERTED PISTON
TO POSITION RING
SQUARELY IN CYLINDER
PISTON RING INSTALLATION. Only correct piston
ring installation will assure full power. Carefully note
the ring sequence when removing the worn rings
from the piston. Note especially the ring expander,
as it may be found both behind the second (compression)
ring and the third (oil control) ring.
Although piston rings are installed correctly, they
will not perform unless the piston and cylinder are
reconditioned. Clean and check the ring grooves
for wear. Deglaze the cylinder bore with a fine abrasive
cloth; this will aid in the seating of the rings.
When reinstalling the rings, note the marks on the
first and second rings in dictating the top of the ring.
Stagger the ring end gaps to prevent compression
loss. Use plenty of service classification SF - SJ
rated oil to lubricate all friction surfaces during engine
reassembly.
OFFSET PISTON INSTALLATION FOR OH180 VALVE
OVERHEAD ENGINE. The connecting rod is assembled
to the piston with match marks facing the mechanic
and the arrowhead on the piston pointing to the right
i.e., arrowhead facing the push rod tube area.
34
PISTON RING
RING
CENTERED IN
RING TRAVEL
AREA
CHECK RING
END GAP
INSIDE CHAMFER
TO PISTON TOP
UNDER CUT
(DOWN)
EXPANDER LOCATED
BEHIND THE SECOND
COMPRESSION RING
AND BEHIND THE
OIL CONTROL RING
ARROWHEAD
MATCH MARKS
ARROWHEAD FACING PUSH
ROD TUBES