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How Is The Connecting Rod Repaired?

6sa1

Inspection of The Appearance of The Folding Connecting Rod

1、Connecting rod body, such as 6sa1 bearing cover, etc. should not have cracks and damage.

2, bearing cover and bearing seat should be close together, no damage to the combined surface, positioning groove intact.

3, check the connecting rod big head two end face and crank arm clearance with a stopper, its size should be in line with the provisions, otherwise it should be replaced.

4, check the connecting rod bolts and nuts. If the thread has more than two teeth damage, the bolt has cracks or obvious defects, bolt elongation and deformation; or the bolt and nut with each other with excessive clearance, there is obvious looseness, should be replaced.

Inspection of Folding Connecting Rod Deformation

1, the connecting rod cover installed on the connecting rod (without bearings), and tighten according to the specified torque, while installing the repair piston pin.

2, the connecting rod bearing hole set in the prismatic support seat of the tester, adjust the shaft end adjustment screw, so that the prismatic support seat on the centering block outward, the connecting rod fixed in the tester

3, the three-point gauge of the tester’s V-shaped surface against the top surface of the piston pin, observe the three measuring points of the three-point gauge and the test plate contact situation.

4, if the three points of the gauge are in contact with the test plate, the rod is neither bent nor distorted.

5, if the upper measuring point and the plate contact, the following two measuring points and the plate does not contact, and the gap with the plate is equal, or the following two measuring points and the plate contact, and the upper measuring point and the plate does not contact, it shows that the rod bending, at this time with the stopper measured the gap between the measuring point and the plate value, that is, the rod in the 100mm length of the bending value.

6, if only a lower measuring point and flat contact, and the gap between the upper measuring point and flat is equal to another lower measuring point and flat gap of 1/2, then the gap between the lower measuring point and flat, that is, the twist value of the connecting rod in the length of l00rnm.

7, if a lower measurement point and the flat contact, but the upper measurement point and the gap between the flat is not equal to another lower measurement point and the gap between the flat l/2, at this time indicates that there is both bending deformation and twisting deformation of the connecting rod, the gap between the lower measurement point and the flat for the twisting value of the connecting rod in the l00mm length. The difference between the gap between the previous measurement point and the flat plate and the gap between the next measurement point and the flat plate of 1/2, is the bending value of the connecting rod in the length of 100mm.

8, so that the end of the big end of the rod and the flat surface against the distance between the small end of the rod and the flat surface a; the rod will be turned 180 degrees with the same method to measure the distance b, if the two measured values are not equal, that there is a double bending of the rod, the difference between the two measured values (a a b), that is, the value of double bending.

Maintenance Issues of Connecting Rod

1.Pay attention to the specifications for the use of connecting rod bolts.

B series engine, the connecting rod bolt using plastic area rotation angle tightening method, so that the bolt stretching in the elastic deformation range, to achieve its calibrated pressure on the fastener.

2.bushing assembly must be interference fit

Connecting rod small head bushing seat hole reaming, must be optional to increase the size of the bushing, never use the hole buried nail method to fix the mismatched bushing.

3.assembly bushing method should be law

Bushing in the assembly, must be guided by the right after the press bed pressure, not arbitrarily using inappropriate methods of assembly.

4. should pay attention to the adjustment method of bearing clearance,When the connecting rod journal and bearing optional clearance is too large, do not use the method of grinding bearing cover and connecting rod combined surface to adjust the clearance, and do not use the back of the bearing pad method to adjust the clearance to prevent the work of blocking the lubricating oil hole.

5.should pay attention to the review of the connecting rod after correction

 

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