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1 cylinder
1.1 Measure the roundness and cylindricity of the cylinder, and determine the cylinder or replace it according to the degree of wear.
1.2 The roundness and cylindricity of the cylinder are in accordance with Table 5.
Cylinder diameter Maximum wear roundness Maximum wear cylindricity
>200~250 0.40 0.25 soil 0.04
>250~300 0.45 0.30 soil 0.05
>300~350 0.50 0.35 soil 0.05
>350~400 0.55 0.40 soil 0.06
>400~450 0.60 0.45 soil 0.06
>450~500 0.65 0.50 soil 0.07
1.3 The inner surface of the cylinder should be free of cracks, blisters, scratches, grooves and other defects, and the surface roughness is 1.6.
1.4 The diameter of the cylinder after the hammer cylinder shall not increase by more than 2% of the original size, and the wall thickness shall not exceed 1/12 of the original wall thickness.
1.5 The cylinder water jacket is not allowed to have defects such as cracks or leaks.
2 crankshaft, connecting rod and bearing bush
2.1 crankshaft
2.1.1 Measure the degree of wear of the crankshaft main journal and the crank neck. To determine repair or replacement, the main journal can be repaired by metal brush plating or spraying.
2.1.2 The wear values ​​of the main journal and the crankshaft are in accordance with Table 6.
2.1.3 The maximum reduction of the crankshaft journal shall not exceed 3% of the original diameter.
Maximum wear allowable value
Journal diameter: ≤80
Spindle neck roundness: 0.05
Spindle neck cylindricity: 0.04
Crank neck roundness: 0.05
Crank neck cylindricity: 0.04
Journal diameter: 81~180
Spindle neck roundness: 0.06
Spindle neck cylindricity: 0.05
Crank neck roundness: 0.06
Crank neck cylindricity: 0.05
Journal diameter: 181~270
Spindle neck roundness: 0.08
Spindle neck cylindricity: 0.08
Crank neck roundness: 0.08
Crank neck cylindricity: 0.08
2.1.4 Scratch of the crankshaft main journal and the crank neck, the area of ​​the dimple shall not be greater than 2% of the area of ​​the journal, and the depth of the groove shall be 0.10 mm, which shall be ground and repaired.
2.1.5 If the crankshaft is subjected to non-destructive testing or a magnifying glass inspection, the crankshaft should be replaced when there is a crack.
2.1.6 The parallelism of the crankshaft axis of the crankshaft to the crankshaft reference axis is 0.20-0.30 mm.
2.1.7 The straightness of the crankshaft is Φ0.05mm.
2.2 Connecting rod
2.2.1 The parallelism of the small pin hole axis of the connecting rod to the reference axis of the connecting rod is 0.3 mm.
2.2.2 The bending or torsion deformation of the connecting rod can be checked or corrected by the connecting rod corrector. If the calibration still fails to meet the quality standard, it should be replaced.
2.2.3 The verticality of the center line of the connecting rod big and small pin hole is 0.50mm.
2.3 bearing bush
2.3.1 The bearing alloy should be well adhered to the tile shell and must be free of defects such as cracks, pores and delamination.
2.3.2 The contact area between the bearing bush and the bearing housing shall not be less than 40-50%, and no gasket shall be placed between the two.
2.3.3 The bearing bush and the journal should be in point contact with uniform contact, and the contact angle should be 60-90. The contact point is not less than 2-3 points per square centimeter.
2.5.4 The radial clearance between the bearing bush and the journal should be 1‰ (D is the journal diameter).
3 piston, piston ring
3.1 The surface of the piston and piston ring should be smooth and free from defects such as cracks, blisters and scars.
3.2 The installation clearance and relative allowable wear value of the piston and cylinder are shown in Table 7.
3.3 The piston ring should have sufficient spring force and the total length of the contact surface with the cylinder wall is not less than 60% of the circumference.
3.4 Piston ring in the ring groove, the opposite mouth should be staggered from each other 120o
3.5 The clearance of the piston ring in the cylinder, the backlash in the ring groove and the maximum wear value are shown in Table 8.
Cylinder diameter: >200~250
Installation gap counterpart: 1.00
Installation gap backlash: 0.05~0.07
Allow maximum wear to match: 4.00
Maximum wear side clearance allowed: 0.20
Cylinder diameter: >250~300
Installation clearance counterpart: 1.20
Installation gap backlash: 0.06~0.09
Allow maximum wear to match: 4.50
Maximum wear side clearance allowed: 0.20
Cylinder diameter: >300~350
Installation gap counterpart: 1.40
Installation gap backlash: 0.06~0.09
Allow maximum wear and tear counterpart: 5.00
Maximum wear side clearance allowed: 0.20
Cylinder diameter: >350~400
Installation clearance counterpart: 1.60
Installation gap backlash: 0.70~0.10
Allow maximum wear counterpart: 5.50
Maximum wear side clearance allowed: 0.20
Cylinder diameter: >400~450
Installation gap counterpart: 1.80
Installation gap backlash: 0.70~0.10
Allow maximum wear and tear counterpart: 6.00
Maximum wear side clearance allowed: 0.20
Cylinder diameter: >450~500
Installation gap counterpart: 2.00
Installation gap backlash: 0.09~0.12
Allow maximum wear and tear counterpart: 6.50
Maximum wear side clearance allowed: 0.20
4 piston rod
4.1 The maximum wear of the piston rod must not exceed 0.05-0.07D (D is the diameter of the piston rod).
4.2 The straightness of the piston rod is Φ0.10mm.
5 valve and seat
5.1 The joint surface of the valve plate and the valve seat should not be somewhat etched, scratched and other defects.
5.2 The valve plate and the valve seat should be in strict contact, and there should be no continuous leakage within five minutes after the kerosene test.
5.3 The valve spring should have sufficient spring force and the free height of the same valve spring should be the same.
6 crossheads and guides
Cross head diameter mounting clearance
80-120 0.20-0.24
>120-180 0.24-0.29
>180-260 0.29-0.34
6.1 Crosshead should be free of defects such as cracks
6.2 The maximum wear of the crosshead pin is not more than 0.50mm.
6.3 The clearance between the crosshead and the guide rail shall comply with the requirements of Table 9.
6.4 The clearance between the crosshead pin and the bushing is 0.03-0.06mm.
6.5 The contact surface of the crosshead and the guide rail is 60%, and the contact points should be evenly distributed.
7 Adjustment requirements
7.1 The clearance of the piston at the front and rear dead points is 1.50-2.00mm.
7.2 The valve position adjustment method is as follows:
a. Making the crank of the crankshaft just exceed the front dead point;
b. The position of the eccentric is at the highest point on the vertical line;
c. Place the valve in the center of the cylinder seat;
d. The transmission mechanism of the entire valve is fixed at the above position.
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