Suzuki GZ250 Marauder Service Manual page 62

CYLINDER HEAD DISTORTION
Decarbon the combustion chamber. Check the gasket surfac e
of the cylinder head for distortion using a straightedge and
thickness gauge. Take clearance readings at several places.
If readings exceed the service limit, replace the cylinder head.
09900-20803: Thickne ss gauge
Service Limit: 0.05 mm (0.002 in)
VALVE FACE W EAR
The t hickness of the valve face decreases as the face wears.
Visually inspect each valve face for wear and re place any
valve with an abnormally worn face. Measure t he valve face
thickness
a new one.
09900-20101: Vernier calipers
Service Limit: 0.5 mm (0.02 in)
VALVE STEM RUNOUT
Support the valve using V-blocks, as shown, and measure its
runout with the dial gauge. If the runout exceeds the limit,
replace the valve.
09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand 09900-
21304: V-block (100 mm)
Service Limit: 0.05 mm (0.002 in)
VALVE HEAD RADIAL RUNOUT
Place the dial gauge at a right angle to the valve head face
and measure the valve head radial runout.
If it meas ures more than the service limit, replace the
valve.
09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand 09900-21304:
V-block (100 mm)
Service Limit: 0.03 mm (0.001 in)
VALVE STEM DEFLECTI ON
Lift the valve about 10 mm (0.39 in) from the valve seat.
Measure the valve stem deflection in two directions, " X" and
"Y", perpendicular to each other. Position the dial gauge as
shown. If the deflection exceeds the service limit, then
determine whether the valve or the guide should be replaced
with a new one.
09900-20606: Dial gauge (1/100 mm) 09900-
20701: Magnetic stand
Service Limit
Intake and exhaust valve s: 0.35 mm (0.014 in)
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, if it is out of specification, replace the valve with
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ENGINE 3-26