O.S. Engines 21VZ-M - Manual (Page 8)

14
Screw in the screw gently until it stops.
Tighten a further
120-180˚
Epoxy glue
or LOCTITE
INSTALLATION OF CARBURETOR
Carburetor
Sealing Washer
Carburetor Retainer
Insert the carburetor seal washer onto the
bottom of the carburetor installing hole on the
crankcase.
Insert the carburetor retainer into the position
shown in the sketch and install the carburetor
into the installing hole.
Make sure that the carburetor is inserted
securely to the bottom of the installing hole.
Then, screw in the fixing screw gently until it
stops. Screw in 120-180 degrees further.
Do not fasten further, or the carburetor
spacer will be damaged. 120-180 degrees
further tightening is just enough because the
retainer pinches from the both sides.
15
INSTALLATION
Make sure that the engine mounting beams in
the hull are parallel, with their top surfaces in
the same plane. If they are not, the engine will
not rest firmly as the engine mounting faces
(undersides of the mounting lugs) are precision
machined to be flat and in the same plane.
Poor installation may not only cause vibration,
erratic running and loss of performance, but
may also damage the engine itself by
deforming the crankcase, cylinder, etc.
The mounting beams and adjacent hull
structure should be as rigid as possible so that
the engine may develop its full performance.
Use 3mm steel screws, such as Allen socket-
head type, with locknuts, for bolting the engine
to the mounting beams.
1.
2.
3.
Touches here
Chamfer edges
Touches here
File off Cut out
Before installing the engine in the model, clean out
the engine room. Especially if the sand paper and
glass wool residues are not removed completely,
they may be sucked into the engine and damage
the engine.
Screws are prone to loosen during flights. Be
sure to use the Lock Washers available as
optional extra or locking glue for slack
prevention. 4.
If the holes in the mounting beams do not align
exactly with the engine's mounting lugs,
enlarge them slightly with a needle file so that
the mounting screws pass through the holes
smoothly without being forced.