Suzuki GSX-R750, Service Manual

Page: 82 / 495

3-34 ENGINE
• Remove the oil seal
1
and the spring seat
2
.
#
Do not reuse the removed oil seal.
• Remove the other valves in the same manner as described
previously.
CYLINDER HEAD DISTORTION
• Decarbonize the combustion chambers.
• Check the gasketed surface of the cylinder head for distortion
with a straightedge and thickness gauge, taking a clearance
reading at several places indicated.
• If the largest reading at any position of the straightedge ex-
ceeds the limit, replace the cylinder head.
[
09900-20803: Thickness gauge
Cylinder head distortion:
Service Limit: 0.20 mm (0.008 in)
VALVE STEM RUNOUT
• Support the valve using V-blocks and check its runout using
the dial gauge as shown.
• If the runout exceeds the service limit, replace the valve.
[
09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block set (100 mm)
Valve stem runout:
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 measures more than the service limit, replace the valve.
[
09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block set (100 mm)
Valve head radial runout:
Service Limit: 0.03 mm (0.001 in)
VALVE FACE WEAR
• Visually inspect each valve face for wear. Replace any valve
with an abnormally worn face. The thickness of the valve face
decreases as the face wears. Measure the valve face
T
. If it is
out of specification, replace the valve with a new one.
[
09900-20102: Vernier calipers
Valve head thickness
T
:
Service Limit: 0.5 mm (0.02 in)