8-1
Cylinder Head / Valve
Service Information
General
Rocker arm and cam shaft can be serviced with the engine installed in the frame. To service the
cylinder heads. the engine must be removed from the frame.
Cam shaft lubrication oil is fed through an oil pipe. Be sure that the oil pipes and orifice are not
clogged before installing the cylinder head.
Specifications
8. Cylinder Head / Valve
Service Information
…………………8-1
Troubleshooting ………………………8-2
Camshaft Removal ……………………8-3
Cylinder head Removal………………8-5
Cylinder Head Disassembly…………8-6
Valve Guide Replacement……………8-8
Valve Seat Inspection ………………8-9
Cylinder Head Assembly ……………8-11
Cylinder Head Assembly ……………8-13
Cylinder Heand Installation …………8-13
Item Standard Service Limit
Rocker Arm
Rocker Arm I.D 12.016~12.034(0.4731~0.4738) 12.060(0.4748)
Rocker Arm O.D 11.982~12.000(0.4717~0.4724) 11.950(0.4505)
Cam Shaft Cam Height
IN. 37.640~37.800(1.4819~1.4881) 37.420(1.4732)
EX. 37.520~37.680(1.4772~1.4835) 37.300(1.4685)
Valve Spring Free Length
IN., EX. 41.65(1.640) 40.0(1.57)
Valve Stem O.D
IN. 4.975~4.990(0.1959~0.1965) 4.925(0.1939)
EX. 4.995~4.970(0.1951~0.1957) 4.905(0.1931)
Valves Valve Guide I.D IN., EX. 5.000~5.012(0.1969~0.1973) 5.03(0.198)
Stem to Guide IN. 0.010~0.037(0.0004~0.0015) 0.08(0.003)
Clearance EX. 0.030~0.057(0.0012~0.0022) 0.10(0.004)
Valve Seat Width 0.7~0.9(0.028~0.035) 1.3(0.051)
Unit:mm(in)
8
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