Husqvarna NUDA 900 R 2012 Workshop Manual page 28

NUDA 900 2012/2013 - NUDA 900 R 2012/2013
Trouble
Engine excessively noisy
Manuale d'officina Ed. 11-2011
TROUBLESHOOTING
Possible causes
Noise is heard when the engine is
started:
Sprag clutch, sprag clutch housing or fre-
ewheel gear worn
Teeth of starter motor and/or starter drive
gears worn
Chain tensioner does not work
Noise seems to come from the valve
train:
Excessive valve clearance
Chain tensioner does not work
Camshaft or brackets of camshaft worn
Camshaft drive worn or loose
Camshaft chain, chain guide or chain tension
guide worn
Noise seems to come from the piston:
Piston or cylinder worn
Piston pin bore or piston pin worn
Piston rings broken or ring grooves worn
Noise seems to come from the crankshaft
or balancing swing arm or crankcase:
Bearings of crankshaft or conrods worn
Needle bushing and /or bearings of balan-
cing swing arm and/or balancing rod worn
Noise seem to come from the clutch or
clutch side:
Friction plates (hammer heads) and/or
clutch drum worn
Excessive or insufficient backlash of the
teeth of the primary drive gears
Clutch drum, clutch hub or pressure plate
worn
Bearing of clutch gear worn
Disk springs of primary drive assy. worn
Springs and spring retainers of primary
drive assy. Worn
Noise with clutch engaged - ball bearing of
the pressure plate worn
Noise seem to come from the gearbox:
Tooth flanks of the gearbox gears worn
Ball bearing of gearbox shafts and/or needle
bearings of gears worn
C.6
Remedy
Replace Sprag clutch, sprag clutch housing
or freewheel gear
Replace starter motor and/or starter drive
gears
Noise disappears after the engine is started
when oil pressure is available
Adjust valve clearance according to spe-
cification
Replace chain tensioner
Replace camshafts and/or cylinder head
Tighten or replace camshaft gears
Replace camshaft chain, chain guide or
chain tension guide
Replace piston or cylinder
Replace piston pin bore or piston pin
Replace piston rings broken or ring groo-
ves
Replace crankshaft and/or conrod bearings
and /or replace crankshaft and conrods
Replace balancing swing arm with balan-
cing rod
Replace friction plates and /or clutch
drum
Replace primary drive assy.
Replace clutch drum, clutch hub or pres-
sure plate
Replace primary drive assy.
Replace primary drive assy.
Replace springs and spring retainers
Replace ball bearing
Check gears and gear shafts, replace if
necessary
Replace bearings