Camshaft Runout - HYOSUNG RT 125 D Service Manual

⊙ ⊙ CAMSHAFT RUNOUT
Support the camshaft using a V-blocks and measure
the camshaft runout using the dial gauge. If the
runout exceeds the service limit, replace the
camshaft with a new one.

Camshaft runout

(IN. & EX.)
Dial gauge : 09900-20606
Magnetic stand : 09900-20701
V-block : 09900-21304
⊙ ⊙ 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
be measured with a micrometer. Replace camshafts
if found it worn down to the limit.
Cam height
Intake cam
Exhaust cam
Micrometer(25~50 mm) : 09900-20202
Service limit
0.10 mm (0.004 in)
, which is to
Service limit
34.17 mm (1.345 in)
34.12 mm (1.343 in)
Intake open
(B.T.D.C)
270。
Intake close
(A.B.D.C)
VALVE TIMING DIAGRAM
35
ENGINE 3-12
TDC (0。 。 )
Exhaust close
(A.T.D.C)
17。
45。
90。
48。
14。
Exhaust open
(B.B.D.C)
(180。 。 )
BDC