Dnepr MT9 - Checking the Engine for Technical Condition by Noises and Knocks

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Table 1
Checking the Motorcycle Engine lor Technical Condition by Noises and Knocks
Point s (junction of com-
En gine !her-
Engine operating Poin ts (l ocatio n s)
Cone! usions regarding
pone nt s) of possible kn ocks
mal condi·
conditions to be I istened to
~aturc ol knocks
further usage
tions
Piston pin - conn ect -~ Warmed
U nd er loa d,
Cylinder loca-
Clear shrill me tal- I Must not he opera ted.
ing -rod small e nd up
followed
by
a
lion
lie
knock Cl e an the combu stion
s udd en
incr
ease
chamb er to r emove car-
in ro
tati ona l
bon de
posits; if neccs-
speed sa ry, replace the piston
pin en sur ing that i ts co-
louring
corresponds
to
that of con n ect ing
rod
sma ll end
Same
Pi ston pin - piston
Sa me
Same Same
Knocks
no t so
boss
clea r
but be come
more distinct as the
engine warms to a
higher tc n1p c rature
Pi s ton - cylinder
Cold
Idling
Cylinder Joca -
Dry metallic knock
May
be operated
in
lion
\\"hich becomes mo- case the !mock disap-
re apparent as the
peMs as the
engi ne
rota tiona I
spe ed
warms up. When r epai r-
changes; the knock ing ,
repl ace
the piston
be comes l ess audible
as the e ngine war ms
up
<0
I
Simi la r kno ck due
Must not be operate d.
· to the pin bein g
Replace the piston and
I se ized in the con -
p: n
necting-rod sma ll
end
i
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