Suzuki FU150SC Manual page 28

3-17 ENGINE
CYLINDER HEAD DISTORTION
Decarbon the combustion chamber.
Check the gasketed surface of the cylinder head for distortion
with a straightedge and thickness gauge, taking a clearance
reading at several places as indicated. If the largest reading at
any position of the straightedge exceeds the limit, replace the
cylinder head.
Service Limit : 0.05 mm
09900-20803 : Thickness gauge
VALVE FACE WEAR
Measure the thickness @ and, if the thickness is found to
have been reduced to the limit, replace the valve.
NOTE :
Visually inspect each valve for wear of its seating face.
Replace any valve with an abnormally worn face.
Service Limit : 0.5 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.
Service Limit: 0.05 mm
09800-20701 : Magnetic stand
09900-20606 : Dial gauge (1/100 mm)
09900-21304 : V-block (100 mm)
VALVE HEAD RADIAL RUNOUT
Place the dial gauge at right angles to the valve head, and
measure the valve head radial runout.
lf it measures more than limit, replace the valve.
Service Limit: 0.03 mm
VALVE STEM DEFLECTION
Life the valve about 10 mm from the valve seat. Measure the
valve stem deflection in two directions, "X" and "Y", perpen-
dicular to each other, by positioning the dial gauge as shown.
lf the deflection measured exceeds the limit, then determine
whether the valve or the guide should be replaced with a new
one.
Service Limit :
Intake and exhaust valves: 0.35 mm_
ENGINE 3-18
VALVE STEM WEAR
if the valve stem is worn down to the limit, when measured
with a micrometer, and the clearance is found to be in excess
of the limit indicated previously, replace the vaive, if the stem
is within the limit, then replace the guide. After replacing valve
or guide, be sure to re-check the clearance.
Valve stem O,D.
IN. : 4.475-4.490 mm
Standard
EX. : 4.455-4.470 mm
09900-20205 : Micrometer (0-25 mm)
NOTE :
VALVE GUIDE SERVICE
e Remove the valve guide with a valve guid remover.
09916-44310 : Valve guide remover
NOTE :
* Discard the removed valve guide subassemblies.
NOTE:
Insert the reamer from the combustion chamber and always
turn the reamer handle clockwise.
Fit a fing to each valve guide.
09916-44310 : Vaive guide installer
AXCAUTION