61
outside cut section should be put down and remember not to the contrary. Firstly the oil controlling ring,
then the second compression ring, and finally the first compression ring. As assembling the ring, its
maximum tension should be inferior to the diameter of the cy1. 65mm), or the ring would be
deformed and broken. The two cotters of the steel band combination oil ring and oil control spacer ring
should be parted with a angle of 120
°
.And the cotters of cast iron oil ring and screw spacer ring should be
parted with a interval of 180
°
. The piston should rotate freely in the ring groove without blocking.
Fig.81
Installation of the piston and rod assembly
：
Apply engine oil on piston, piston ring and cylinder bore. Stagger 120
°
among the first compression
ring, the second ring and oil ring cotter, then install piston rod into cylinder bore. push the piston an rod
assembly by hammer into the cylinder bore.
——Apply engine oil on the connecting rod bushing.
Mount connecting rod cap. Retain connecting rod body and cap with two elastic retaining pins.
——Tighten connecting rod bolt to 30—36Nm. apply engine oil on the bolt head and bolt threads before
installation.
——The side play of big end is 0.092—0.268mm
。
【
10
】
. The removal and installation of flywheel assembly and carrier assembly of real
crankshaft oil seal
1). The removal and installation of flywheel assembly removal
：
——Remove six M10 bolts and replace bolts.
——Remove flywheel. Check if there is crack in the surface of clutch plate. Check ring gear teeth for
crack, wear, pitting. Installation
：
——The press fit clearance of gear ring and flywheel is 0.48—0.86mm. The gear ring should be
pressed when heated to 300
℃
.
——The retaining hole of flywheel and the retaining journal of crankshaft is of clearance fit.
clearance is 0.012—0.074mm. Try to push it lightly after centering. Don’t strike the crankshaft by the
hammer.
——During assembling, align the installation mark hole and fabrication hole on the crankshaft.
Screw in 6 new bolts by hand. Bolts should have sealant on them. Tightening torque is 82—92Nm.
