Tecumseh AH520 -, Руководство пользователя

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CYLINDERS & INTERNAL COMPONENTS
PISTON & RING SERVICE
Before removing the piston, clean all carbon from the
cylinder, making certain that the carbon ridge is removed
from the top of the cylinder. This will prevent ring damage
when removing the piston.
Push the piston through the top of the cylinder using
a wooden dowel on the inside of the piston so that
the connecting rod and other parts will not be damaged.
Check the piston and cylinder for scoring or other
damage.
Check the piston rings for wear by inserting them into
the cylinder to about 1/2 inch from the top of the cylinder.
Check at various places to make sure that the gap
between the ends of the ring do not exceed the
dimensions indicated in the Table of Specifications.
Bore wear can be checked by the same method, except,
use a new ring to measure the end gap.
Before installing the piston into the bore, put oil on
the rings and piston, and stagger the ring end gaps.
RING
CENTERED
IN RING
TRAVEL AREA
PISTON RING
FEELER GAUGE
CHECK RING END GAP
INVERTED PISTON
TO POSITION RING
SQUARELY IN CYLINDER
STAGGER RING END GAPS
Most models have offset pistons. The pistons on these
models have a “V” or "S" stamped on the piston head.
When installing piston, this “V” mark must be in a 3
o’clock position when viewing the engine with the
exhaust ports down.
"S" OR "V" MARK
AT THE 3 O'CLOCK
POSITION AND THE
EXHAUST PORTS
DOWN