Cylinder Head Servicing; Cylinder Head Distortion; Valve Face Wear - Suzuki DR350 Service Manual

CYLINDER HEAD SERVICING
• Compress the valve sp rings w ith the specia l too ls.
• Remove the va lve cotters.
09916· 14510 : Valve spring compressor
09916-14910 : Attachment
09916-84510 : Tweezers
• Remove the valve sp ring ratainer. inner spring and outer
spnng.
• Remove the va lves.
• Remove the o il seal, and remove the spring seat.
NOTE:
Removal of valves completes ordinary disassembling work.
If valve guides have to be removed for replacement after
inspection related parts, carry out the steps shown in valve
guide servicing.
CYLINDER HEAD DISTORTION
Decarbon the combustion chamber .
Check the gasketed surface o f the cylinder head for distor+
tion with a straightedge and thickness gauge, taking a clear-
ance 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 10.002 inl
VALVE FACE WEAR
Measure th e thickness (1)and, if the thickness is found to
have been reduced to the limit. replacle th e valve .
NOTE:
Visually inspect each valve for wear of its seating face.
Replace any valve with an 8bnormally worn face.
Service Limit : 0 .5 mm 10.02 inl
ENGINE 3·16