O.S. Engines 21XZ-M - Manual (Page 14)

26
CARE AND MAINTENANCE
1.
2.
3. The minute particles of foreign matter, that
are present in any fuel may, by accumulating
and partially obstructing fuel flow, cause
engine performance to become erratic and
unreliable. O.S. 'Super-Filters' (large and
small) are available, as optional extras, to
deal with this problem. One of these filters
installed to the pickup tube inside your
refueling container, will prevent the entry of
foreign material into the fuel tank. It is also
recommended that a good in-line filter be
installed between the tank and carburetor.
Do not forget to clean the filters regularly to
remove foreign matter that accumulate on
the filter screens. Also, clean the carburetor
itself occasionally.
At the end of each operating session, drain out
any fuel that may remain in the fuel tank.
Afterwards,energize the glow-plug and try to
restart the engine, to burn off any fuel that may
remain inside the engine. Repeat this
procedure until the engine fails to fire. Do this
while the engine is still warm.
4. Then, inject some after-run oil into the
engine, and rotate the engine with an
electric starter for 4 to 5 seconds to
distribute the oil to all the working parts.
Note:
Do not inject after-run oil into the
carburetor as this may cause the O-rings
inside the carburetor to deteriorate. These
procedures will reduce the risks of starting
difficulties or corrosion after a period of
storage.
27
CHECKING THE ENGINE
Engine will not develop normal performance
after long time running due to wearing of parts.
It is suggested to replace necessary parts when
the following symptoms are detected.
Engine sound changes and easily overheats.
Power has dropped extremely.
Idling is unstable and/or engine tends to stop
at idling.
In most cases, ball bearings, cylinder & piston
assembly, connecting rod and/or crankcase have
become worn out or abnormal. Check the
parts carefully and replace them if necessary.
5. Finally, when cleaning the exterior of the
engine, use methanol or a household
cleaning agent. Do not use gasoline,
kerosene, or any petroleum based chemical
which can damage silicone fuel tubing.
Crankshaft of this engine is filled with
silicone. Do not use light oil nor
kerosene, etc. for washing, or the
silicone will swell. Use alcohol or fuel for
washing.
Note:
Remove this with
an 8mm wrench Dirt and fbrous matter
mostly accumulate here