Maintenance Manual of 4M11 Series Diesel Engine For Land Power Generators
28
end bearing and clear metallic knocking sound (especially at low
and high speeds)
guarantee specified clearance.
6 Excessive clearance between connecting rod and bearing, with
dumb impact sound
Replace bearing
7 Excessive clearance of main bearing (similar to knocking sound of
connecting rod bearing)
Replace main bearing
8 Impact between piston and valve and metallic knocking sound near
cylinder at low speed
Check valve timing.
9 Excessive gear clearance and knocking sound in gear chamber at
sudden reduction of speed
Check and adjust gear clearance and
when necessary replace gear.
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