Trouble Diagnosis - Panterra Fusion Service Manual

NIKOTA USA: PANTERRA SCOOTER SERVICE MANUAL
7. Cylinder Head Valve
Torque Value
•Camshaft bolt 16 ft lbs
•Lubricate threads with oil
•Valve gap adjusting screw cap 7 ft lbs
General tools
•Valve spring compressor
•45 degrees IN/EX
•Valve seat reamer 24.5mm
•Plane reamer 30 degrees IN
•Valve seat reamer25mm
•Plane reamer 32 degrees EX
•Valve seat reamer 22mm
•Plane reamer 60 degrees IN/EX
•Valve seat reamer 26mm
•Reamer damping fixture 5mm
Special tools
•Valve spring compressor accessories
•Valve gap regulatory spanner
•Valve guide screwdriver
•Valve guide reamer

Trouble Diagnosis

•Confirm poor operation of cylinder head by
measuring pressure or by noise produced
by engine upper end.
CHAPTER 7: CYLINDER HEAD VALVE
Slow Speed Hitch
Compression pressure too low
Bad valve gap
Burning or curving of valve
Bad valve timing
Broken valve spring
Bad valve seat
Leakage of cylinder head gasket
Warped cylinder head surface or cracking
Bad spark plug
Compression Pressure Too High
•Too much carbon buildup in combustion
chamber
White Smoke from Exhaust Pipe
•Wearing of valve guide
•Broken oil seal
Abnormal Noise
•Bad valve gap
•Broken or burning of valve or valve spring
•Wearing and breaking of camshaft
•Wearing of inner chain adjusting plate
•Wearing of cam shaft and valve rocker arm
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