3-44 ENGINE
VALVE SPRING
The force of the coil spring keeps the valve seat tight. Weak-
ened spring results in reduced engine power output, and often
account for the chattering noise coming from the valve mecha-
nism.
Check the valve springs for proper strength by measuring their
free length and also by the force required to compress them. If
the spring length is less than the service limit, or if the force
required to compress the spring does not fall within the range
specified, replace it.
" 09900-20102: Vernier calipers
& Valve spring free length (IN & EX)
Service Limit: 39.6 mm (1.56 in)
Valve spring tension (IN & EX)
Standard: 197 – 227 N/35.6 mm
(20.1 – 23.1 kgf/35.6 mm, 44.3 – 51.0 lbs/1.40 in)
CAM DRIVE IDLE GEAR/SPROCKET THRUST CLEARANCE
Install the cam drive idle gear/sprocket
1, its shaft
2, copper
washer
3 and thrust washer
4 to each cylinder head. Tighten
the shaft
2 to the specified torque. Use a thickness gauge to
measure the thrust clearance between the cylinder head and the
thrust washer
4.
& Cam drive idle gear/sprocket thrust clearance
Standard: 0.15 – 0.29 mm (0.006 – 0.011 in)
$ Cam drive idle gear/sprocket shaft:
40 N·m (4.0 kgf-m, 29.0 lb-ft)
" 09900-20803: Thickness gauge
197 – 227 N
35.6 mm
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