Sachs SA 280A User Manual

Decarbonizing the exhaust muffler , cylinder and cylinder head
Whe n dealing wi th com pla in ts and repoirs, the following should be bor ne in min d:
In every engi ne a p ropo rtion of th e lubrication oil is burnt ond forms carbon which,
in a two-stroke engine, is deposited chiefly on the piston (fown, in the transfer port of
the cylinder and in the exh aust mu ff ler. The corbon should be removed ofter every
200 running hours, at the lotest when the e ng ine performance drops or when, even
wi th correct corburellor setting, the engine lends 10 four-stroke.
Fi g. 50
Exhaust muffler
Fig. 50
The exha ust muffler cannot be
dis ma ntled for cl eaning.
Corban deposils may be burnt
off by heating the muffler 10 red
heat by me an s of a weld i ng torch
or in a fo rge fire.
I
No modifications should be mode to the exhaust muffler, as any such alterations
wi ll be detrimental to performance, fuel consumption and wi ll increase engine
noise. Modifications of any kind to the exhaust muffler are in any case illegal
a
nd constitute a puni sh abl e offence.
Cylinder he ad
Un screw the cylinder head and re m ove the carbon deposits from the in si de of I he
combusti on chamber with a screwd ri ver. Take care not to da mag e the surface of
the cham ber .
Cylinder
port s
Place piston at bottom dead ce nter.
Remove
carbon deposits in exhaust port ond transfer ports with a screwdriver.
Care fu lly place piston a t top dead center and remove loose carbon.
Piston
Care fully r emove only th e thick er carbon deposits (fla ke s) from the piston crown.
Do
nottfy to sc rap e th e pi ston crown to a bright m eta ll ic co ndition.
32
ASSEMBLING THE ENGINE
Crankca se and cronkshoft
Fi g. 51
Before assembling, fill the groov-
es of the sholt seah with g r ease
(Alvonio 3 ).
Note:
When assembling
crankcase hal-
v es , hove a look 01 the table on
crankshaft bear ings on page 15 .
On engines equipped with
grooved boll bearing on the
magneto side, he a t the in ner
race of the grooved boll beoring
and insert c ra nk sha ft into the
crankcase half.
Insert both dowe l tubes and
place gasket in position.
Fit
the p. t. a. cra nkca se half
(heat up inner
rir>g on engines
equipped wi th grooved boll
bearing) a nd screw t he two hal-
ves together by mea ns of 4 hexa-
gon socket head screws M 8 x 35
and 2 hexagon socket head
screws M 8 x 60 (on SACHS SA
340 C, 2 hexa gon socket head
screws M 8 x 65) a nd sp ring wa-
shers.
Tightening
torque 2.2 .. 2.4 kpm
(15.9 ... 17.4 fl. lb .).
Sc rew magneto side c ran kcase
half to assembly ji g wilh two
he xagon he ad screws M lOx 40.
Screw in scr ewed nipple II) and
oil dr ain co ck (2) with sea .
Fig. 52
A ft er having screwed the crank-
case hal ves together, press in
cr ankshaft ail seals on power
takeoff and on magneto side
from outside until
flu sh (see illus-
tration).
Fig. 51
Fig. 52
33
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Sachs SA 280A Specifications

General

Brand	Sachs
Model	SA 280A
Category	Engine
Language	English