CAC Gasoline Engine Maintenance And Servicing Manual
14
Engine structural features
1.Cylinder block：Made from gray cast iron. Without bibcock. Without cylinder liner.5 main
bearing seats. Main Intermediate bearing anti-thrust. Main bearing caps are retained by
spigot. Main bearing bolts of 12.9 grade.
2.Cylinder head：Made from aluminum alloy. Intake and exhaust valve seats and valve guides
strutting.6 camshaft supports. Without camshaft bushing. with fuel pump, Push rod and
distributor，Thermo-sister in cylinder head for Carburetor engine. with thermo-sister in
cylinder head for Electric control engine. Cylinder cover bolts of 10.9 grade.
3.Piston：made from eutectic aluminum silicon. Anti-expansion steel-strutted skirt. Ellipse head
and skirt. Cone head. Barrel skirt.
4.Piston ring：First compression ring of ductile cast iron. With excircle sprayed molybdenum.
Ground ring with barrel surface.
Second compression ring is of twist type. made from alloy cast iron.
Steel strip combination oil ring. With scape blade excircle chroming.
5.Piston pin：Low carbon steel. Surface carbonizing and quenching. Semi-floating
structure(Interference fit with small end of connecting rod. Clearance fit with piston pin hole.
6.Connecting rod：Forged steel. Flat insection. Without small end bushing. Connecting rod stem
and cover are retained by 2 spring dowels. Piston and cylinder block is lubricated by oil spray
from connecting rod bearing bore drill. Connecting rod bolts of 12.9 grade.
7.Crankshaft：4 balance weight. Ductalloy. Normalizing treatment.
8.Bearing bushing：Connecting rod bushing,Main bearing bushings and thrust washers are all
made of tin&aluminium duplex metal. Two pieces of thrust washer. They are mounted in
cylinder block.
9.Flywheel：It is made of ductalloy. May be fitted with 190 and 210 clutch. Casted with
crankshaft speed signal disk.
10.Camshaft：It is made of alloy cast iron. Cam and fuel pump eccentric cam high frequency
quenching treatment. 5 supports. Camshaft thrust spacer is made from low carbon steel.
Surface carbonitriding .
11.Rocker arm：Low carbon steel、Stamping. Surface carbonitriding. Rocker arm stud of 10.9
grade.
12.Hydraulic lifting rod：The surface contacting cam is quenched. The contact face with rocker
arm is made of low carbon steel. Surface carbonitriding，Both contact face are circular-arc.
13.Intake valve seat：It is made of alloy cast iron.
14.Exhaust valve seat：Iron base powder metallurgy. Quench treatment.
15.Valve guide：It is made from alloy cast iron.
16.Valve： Intake valve：Made from 4Cr9Si2. With smaller end of conical surface
quenched，With conical surface angle 45°.With large nest seat in the valve head for
hemispherical combustion chamber.
Exhaust valve：4Cr9Si2-21-4N. With conical surface angle 45°.With smaller end
quenched.
17.Gear：Made from iron base powder metallurgy.
18.Timing belt：Made from cyaniding butadiene-acrylonitrile rubber.
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