Suzuki GSX1200 1999 Service Manual page 59

3-24 ENGINE
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 exceeds the limit, replace the cylinder head.
! !
! ! 09900-20803: Thickness gauge !
% %
% Cylinder head distortion % %
Service Limit: 0.2 mm
VALVE STEM RUNOUT
Support the valve with "V" blocks, as shown, and check its runout
with a dial gauge.
The valve must be replaced if the runout exceeds the limit.
! 09900-20606: Dial gauge (1/100 mm) ! ! ! !
09900-20701: Magnetic stand
09900-21304: V-block (100 mm)
% Valve stem runout % %
% %
Service Limit: 0.05 mm
VALVE HEAD RADIAL RUNOUT
Place the dial gauge at right angles to the valve head face, and
measure the valve head radial runout.
If it measures more than the limit, replace the valve.
! !
! 09900-20606: Dial gauge (1/100 mm) ! !
09900-20701: Magnetic stand
09900-21304: V-block (100 mm)
% Valve head radial runout % % % %
Service Limit: 0.03 mm
VALVE FACE WEAR
Visually inspect each valve for wear of its seating face. Replace
any valve with an abnormally worn face. The thickness T de-
creases as the wear of the face advances.
Measure the thickness and, if the thickness is found to have been
reduced to the limit, replace it.
! !
! ! 09900-20102: Vernier calipers !
% %
% % Valve head thickness %
Service Limit T T T T T : 0.5 mm
VALVE STEM DEFLECTION
Lift the valve about 10 mm from the valve seat.
Measure the valve stem deflection in two directions, "X" and "Y",
perpendicular to each other, by positioning the dial gauge as
shown. If the deflection measured exceeds the limit, (see below)
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
% % Valve stem deflection %
% %
Service Limit
Intake and exhaust valves: 0.35 mm
10 mm