Engine Structural Features - Joyner JNSZ1600QL Owner's Manual

Fan speed r/min
Air filter
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
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 m ade 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 ： ： ： ： L ow 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 ： ： ： ： C onnecting 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 ： L ow carbon steel
carbonitriding. Rocker arm stud of 10.9 grade.
、 S tamping. Surface
35
s peed 1500
Ⅰ
s peed 2800
Ⅱ
1GD129607G

Engine structural features

， Thermo-sister