Dnepr MT9 - Page 16

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Troubl e
Engine overheats
Cnusc
3. Va lves do not fit close-
ly to th
eir scats due to accu-
mulatio n of ca rbon deposits
4. Gases burst fo rth from
under cy lind er head
5. Pi ston ri ng s burnt · or
broken
6. Cyl ind ers and pi sto ns cx-
cess iY ely worn
l. No oil or insufficient
amount of it in the c rankca se
2. Enri c hed mixture:
a) ca rbur ettor overfi lled
du e to float needle Ya l ve be-
ing badl y seated ;
b) air clean er dirt y;
c)
carburettor thro tt le need-
le wrongly set
3. Diluted mix tur e:
a) th rottle n ee dle in co rr ect-
ly set;
b) a ir inle akage at carbu-
r ettor -t o-head junctio ns
4. Lat e ignition advance
Symptoms and iJ ul t lracillR
3. L ow compression is ob-
served
4. Bangs arc heard an d lo\\.
compression is obsen·ed
5. L ow compression, eng ine
smokes a
nd splashes the
plugs with oil
6.
To be checked at main-
te nan ce shop
l. Ch ec k o il level
2. Engine fai ls to de\·elop
sufiicient speed:
a) check whether pe trol
flows fr om fl oat chamb 2r
(chamber overfilled)
a) eng ine, if und er l oad ,
fai ls
to de velop the proper
speed;
b) bangs in the ca rbur et l or
Continu ed
Remedy
3. R epair the e ngine. Clean
off carbo n and l ap th e val ves
tl. Tight en the nuts sec ur i ng
the h ea ds lo cy l inder
5. Repair the en gin e. Clean
or r eplace the rings
6. Repair th e e ngin e. Repla -
ce or r epai r the cy linders and
pist ons at maintenanc e shop
I. Fill up w ith o il
2. Clean dirt from the float
c hamb er:
a) repair the carburetlor
1
.
and Ia p the needle va lve;
.. l./
b) r emove the air c lean er
and was h it;
c)
adj ust the ca rbur et tor
a) a dju st th e carb ur e tt or;
b)
tighte n the nuts secu ring
the car bur e tt or to the head. If
in l eakage continues to take
place, re place the gasket.
Check the breaker gap .
Set the igniti on