Valve Guide Installation - HYOSUNG Aquila 250 Service Manual

◉ VALVE GUIDE-VALVE STEM CLEAR-
ANCE
Measure the clearance in the valve guide-valve stem, by
rigging up the dial gauge as shown. If the clearance is
measured exceeds the limit specified below, then deter-
mine whether the valve or the guide should be replaced
to reduce the clearance to within the standard range:
Valve guide-valve stem clearance
IN.
EX.
Dial gauge : 09900-20606
Magnetic stand : 09900-20701
◉ VALVE STEM DIAMETER
Measure the valve stem outside diameter.
If the diameter measured exceeds the standard, replace
the valve.
Valve stem diameter
IN.
EX.
Micrometer(0~25 mm) : 09900-20201

◉ VALVE GUIDE INSTALLATION

● Re-finish the valve guide holes in cylinder head with
a 11.3 mm valve guide reamer ① and valve guide
reamer handle ②.
11.3 mm valve guide reamer : 09916-34561
Valve guide reamer handle : 09916-34542
● Fit a ring to each valve guide. Be sure to use new
rings and valve guides. Use of rings and valve guides
removed in disassembly must be discarded.
● Lubricate each valve guide and drive the guide into
the guide hole using the valve guide installer handle
③ and valve guide installer attachment ④.
Valve guide installer and remover
Valve guide installer attachment
Standard
0.010~0.037 mm
0.030~0.057 mm
Standard
4.475~4.490 mm
4.455~4.470 mm
: 09916-44910
: 09916-44920
②
①
ENGINE 3-22
③
④