HYOSUNG GT 650, Руководство по обслуживанию

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ENGINE 3-22
(B.T.D.C)
Intake open
(T.D.C)
(A.T.D.C)
Exhaust close
(B.B.D.C)
Exhaust open
(A.B.D.C)
Intake close
(B.D.C)
Valve timing diagram
�
Cam height � �
Intake cam
Exhaust cam
Service limit
34.98 mm (1.377 in)
33.08 mm (1.302 in)
Camshaft journal
oil clearance
(IN & EX)
Service limit
0.15 mm (0.006 in)
Valve clearance
Standard(When cold)
0.1 ~ 0.2 mm
(0.004 ~ 0.008 in)
0.2 ~ 0.3 mm
(0.008 ~ 0.012 in)
◉
CAMSHAFT
The camshaft should be checked for runout and also for
wear of cams and journals if the engine has been noted
to produce abnormal noise or vibration or a lack of out-
put power. Any of these abnormality could be caused by
a worn camshaft.
■ CAMSHAFT WEAR
Worn-down cams are often the cause of mistimed valve
operation resulting in reduced output power.
The limit of cam wear is specified for both intake and
exhaust cams in terms of cam height
� , which is to be
measured with a micrometer. Replace camshafts if
found it worn down to the limit.
■
CAMSHAFT JOURNAL WEAR
Determine whether or not each journal is worn down to
the limit by measuring the oil clearance with the
camshaft installed in place.
●
Use the plastigauge to read the clearance at the
widest portion, which is specified as follows :
Micrometer
((
25~50 mm
))
: 09900-20202
◉
TAPPET & SHIM WEAR
When measuring the valve clearance, the clearance
should be within the standard range.
Exhaust valve
Intake valve