Cylinder Head, Cylinder And Piston - Shineray XY400-A Maintenance Manual

XY400–A Maintenance Manual
Maintenance notice
Troubleshooting
Cylinder head cover
Camshaft
The lubrication of the camshaft and rocker arm is implemented by pumping oil by the oil pump through the oil troughs of the
cylinder, cylinder head and cylinder head cover; before assembling, please check whether the oil troughs are unobstructed and
clean them up properly.
Before assembling, clean all parts and components with cleaning agent and dry them with compressed air.
While assembling, coat engine oil and molybdenum disulfide lubricant on the protruding surface of the camshaft for preliminary
lubrication.
Be careful not to damage the cylinder wall and piston.
Technical specifications & maintenance benchmark
Item
Camshaft
Cylinder head
Valve spring
Valve
Valve clearance
Cylinder

Cylinder head, cylinder and piston

Standard value
Camshaft lift: IN 5.5057 mm
Camshaft lift: EX 5.515mm
0.03
Planeness
Internal spring free 36.7mm
length
External spring free 43mm
length
IN Valve stem
φ5.49mm～φ5.475mm
external diameter
Conduit inner
φ5.5mm～φ5.512mm
diameter
EX Valve stem
φ5.46mm～φ5.445mm
external diameter
Conduit inner
φ5.5mm～φ5.512mm
diameter:
IN 0.08mm～0.10mm
EX 0.10mm～0.12mm
Internal diameter
φ85mm～φ85.01mm
Roundness /
Cylindricity /
Cylinder head
Cylinder
Piston
Maintenance notice
51
Cylinder Head, Cylinder and Piston
Maintenance limit value
5.3057mm
5.315mm
0.05mm
35.8mm
41.89mm
φ5.455mm
φ5.53mm
φ5.415mm
φ5.53mm
/
/
φ85.1mm
0.05
0.05