S5 Workshop Manual
Engine
EM-44
Inspect the flatness of cylinder head surface according to the direction shown in
figure. If flatness in any direction exceeds repair limit value, replace cylinder head or
slightly process cylinder head matching surface.
Flatness of cylinder head washer surface.
Standard value: Below 0.03 mm
Limiting value: 0.2 mm
2) Valve
Use a steel wire brush to completely
clean valve.
Inspect whether each valve has abrasion, damage, and head and rod B have
deformation. If necessary, replace it. If rod end surface A has depression or abrasion,
repair the surface according to actual condition. This repair must be limited to the
minimum valve range. Meanwhile, re-process valve surface.
If the allowance amount reduces to below
repair limit valve, replace valve.
Allowance amount
Standard value
Air intake: 1.0mm
Air exhaust: 1.5mm
Limiting value
Air intake: 0.7mm
Air exhaust: 1.0mm
3) Valve Spring
Inspect the free height of each valve spring. If it exceeds repair limit value, replace
spring.
Use a ruler to inspect the verticality of each spring. If the spring is not vertical
seriously, replace it.
EM070
EM069
EM068
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