LONCIN LC2P73F - Engine Noise Diagnosis

Part IV Faults Diagnosis
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4-8 Abnormal noises of engine
(Adjust valve clearance and replace worn parts)
(Check and adjust carburetor)
(Refer to Section 3-4)
(Refer to Section 4-7)
(Remove carbon deposition)
(Replace piston ring)
(Replace worn parts)
(Replace piston and piston ring)
Abnormal
noises of engine
Rattle
Detonation with
metallic sound
Wear of connectin
g
-rod
,
p
iston
p
in and
p
in hole
Breaka
g
eof
p
iston rin
g
Wear of
p
iston and
p
iston rin
g
Excessive carbon de
p
osition in combustor
Overheat of en
g
ine
Clearance of s
p
ark
p
lu
g
electrode too small
Serious fuel rich of en
g
ine
Improper adjustment of valve clearance/wear of
relevant
p
arts
Other abnormal
noises
(Replace connecting parts and re-install)
Loose connection between fl
y
wheel and crankshaft
(
Re
p
lace wore
p
ar
t
s
)
Wear of crankshaft bearin
g
(Replace fuel)
Wron
g
fuel
g
rades
(Replace bearing)
Bearin
g
wear inside crankcase