Yangdong Co. Y90 Series Manuel de service télécharger pdf (Page 30)

OPERATION&MAINTENANCE MANUAL

abrasion, it still remains a certain of radial resilience, therefore, it extends service life of

the oil control ring.

Please check clearance of the opening before installing the piston. Keep the piston

ring flat. 15-20mm away from top face of the cylinder sleeve. Then measure it gas feeler,

clearance of the opening shall be 0.3-0.4mm. See figure 7 for detail. If with clearance of

the opening is smaller, amend it with a file; if clearance of the opening is larger, change a

new one, In addition, it’s necessary to measure the end face clearance between the

piston ring and the piston ring groove with a gap feeler. Clearance for the first gaseous

ring shall be 0.060-0.092mm, and the second gaseous ring shall be 0.040-0.072mm, see

figure 8 for detail.

Special purpose tool shall be employed for dismantling the piston ring. When

assembling, opening positions of each piston ring shall stagger 120 degrees and not put

on the direction of the piston pin.

During maintenance, if the piston ring can not move smoothly, immerse it in diesel

(diesel or petroleum) for twenty-four hours or longer, then knock on the piston ring. After

it is released by itself, take it out of the diesel and clean it with diesel or carbon

tetrachloride.

Check if there is any rupture or crack on the piston ring, change a new one if any

defect is found.

No.45 steel with die forging technology is made of the connecting rod. Section

surface of the connection rod body is I-beam axle. Parting plane of the big end is 45

degrees to the connecting rod body. The connecting rod and connecting rod casing shall

be corresponding borehole. Assemble it with marks and no error shall be made during

assembly. Positioning lip is used for positioning for the connecting rod and connecting

rod casing. Bolts for connecting rod are made of 40Cr steel. The upper and lower shaft

bushings for the connecting rod are made of copper-lead alloy and tin-aluminum with

support. When the clearance exceeds its limit value by abrasion or the surface wears off

or burns. Please change the new ones in couple.

Before overhaul for the diesel or assembling(disassembling) the connecting rod

assembly, clean the deposit carbon and oil stain on upper part of the cylinder sleeve.

Coat clean engine oil on cylinder trepan boring, external surface of the piston, piston ring,

shaft bush for connecting rod, crankshaft, connecting rod journal and etc, then place the

guide bush on the cylinder sleeve. Rotate the crankshaft, assemble the connecting rod in

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Yangdong Co. Y90 Series Manuel de service Page 30