MAINTENANCE MANUAL OF ENGINE
21
2.2 Data
The data are mainly used for engine overhaul in workshop.
Cylinder head
Valve seat angle:
Exhaust valve ------------------------------------------------------------------------------- 90°±20'
Intake valve----------------------------------------------------------------------------------120°±20'
Diameter of valve guide installation hole -----------------------------------------------13
+0.018
0
mm
Leakage test pressure ----------------------------------------------------------------------350-400 KPa
Cylinder head thickness -------------------------------------------------------------------170±0.1 mm
Minimum permissible thickness of cylinder head after machining -----------------169.9 mm
Intake valve
Diameter of valve stem --------------------------------------------------------------------Φ8
-0.025
-0.047
mm
Clearance between valve stem and guide -----------------------------------------------0.025-0.069 mm
Maximum clearance between valve stem and guide-----------------------------------0.069 mm
Diameter of valve head---------------------------------------------------------------------Φ35±0.15 mm
Valve face angle ----------------------------------------------------------------------------120 °±20'
Full length------------------------------------------------------------------------------- ---117±0.1 mm
Sealing manner ----------------------------------------------------------Rubber seal ring mounted to valve guide
Exhaust valve
Diameter of valve stem---------------------------------------------------------------------Φ8
-0.04
-0.55
mm
Clearance between valve stem and guide ------------------------------------------------0.040-0.077mm
Maximum clearance between valve stem and guide------------------------------------0.077mm
Diameter of valve head ---------------------------------------------------------------------Φ29.4±0.1 mm
Valve face angle -----------------------------------------------------------------------------90°±20'
Full length------------------------------------------------------------------------------------117±0.1 mm
Sealing manner -----------------------------------------------------------Rubber seal ring mounted to valve guide
Valve guide
Inner diameter-------------------------------------------------------------------------------Φ8
+0.037
+0.015
mm
Outer diameter------------------------------------------------------------------------------Φ13
+0.040
+0.022
mm
Clearance between valve guide and hole in cylinder head ---------------------------0.036mm
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