Inspection - Yamaha TDM850 1996 Service Manual

VALVE AND VALVE SPRING

INSPECTION

1. Measure:
S Stem-to-guide clearance
Stem-to-guide clearance =
Out of specification ! Replace valve guide.
2. Replace:
S Valve guide
Replacement steps:
NOTE:
Heat the cylinder head in an oven to 100_C to
ease guide removal and installation and to main-
tain correct interference fit.
S Remove the valve guide using the valve guide
remover 1 .
S Install the valve guide (new) using the valve
guide installer 2 and valve guide remover 1 .
S After installing the valve guide, bore the valve
guide using the valve guide reamer 3 to obtain
proper stem-to-guide clearance.
NOTE:
Reface the valve seat after replacing the valve
guide.
4-17
Valve guide inside diameter a –
Valve stem diameter b
Stem-to-guide clearance:
Intake:
0.010 X 0.037 mm
<Limit>: 0.08 mm
Exhaust:
0.025 X 0.052 mm
<Limit>: 0.10 mm
Valve guide remover, installer and
reamer (5.5 mm):
90890-04016
ENG