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What is the Cause of Crankshaft Bearing Damage?

In engine repair, there are many reasons for the damage of bearing bushes. According to statistics, 12.5% ​​of bearing bushes are damaged due to poor lubrication, 41.5% are damaged due to mixed impurities, and 24% are damaged due to insufficient assembly accuracy. 5% are damaged due to excessive load, 6% are damaged due to corrosion and cavitation, and 1% are damaged due to other reasons. In the case of reasonable structural design and correct material selection, most of the damage to the bearing bush is caused by improper assembly and use.

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Crankshaft

1. Bearing Bush Burning

1. Damage Feature

The main reason for the burning of the bearing bush is that the lubricating oil cannot reach between the bearing bush and the journal, so that the bearing bush of the crankshaft works in a state of semi-dry friction or dry friction, resulting in aggravation of friction and wear, resulting in the burning of the engine bearing bush. The burning of the bearing bush will cause the crankshaft to be locked by the bearing bush, resulting in a serious mechanical accident.

2. Cause of Damage

(1) the Engine is Overloaded

When the engine is in overload operation for a long time, the temperature of the lubricating oil increases and the viscosity decreases, resulting in a low oil pressure, and the lubricating oil film between the shaft and the bearing bush is not easy to form, and the heat generated by friction cannot be taken away, resulting in increased friction and adhesive wear of the bearing bush. And burn.

(2) Improper Start-up Operation in Winter

In winter, due to the low ambient temperature and the high viscosity of the oil, the lubricating oil film between the shaft and the bearing bush has not yet formed, and the engine is quickly and forcibly started, causing the bearing bush to burn.

(3) Poor Oil Quality

Poor quality of lubricating oil or water or diesel leakage into the oil pan will deteriorate the oil, and it is difficult to form a good oil film when the lubricating oil is working, causing the engine bearing bush to burn.

(4) Insufficient Amount of Oil

The lubricating oil pipeline is blocked, the filter is seriously blocked, the oil pump is damaged, etc., so that the oil is lacking, the lubrication and cooling strength is not enough, the temperature of the bearing bush rises rapidly when the engine is working, the bearing bush and the journal are expanded and deformed, the gap disappears, and the metal is directly contacted. Burn tiles.

(5) The Bearing Clearance is Too Small

When the engine is assembled, the clearance between the journal and the bearing bush is strictly regulated. If the clearance between the bearing bush and the journal is too small, the flow of lubricating oil will be restricted, and it will be difficult for the lubricating oil to lubricate the bearing bush in operation, and the frictional heat cannot be taken away well, which will cause thermal deformation of the bearing bush and the journal and cause the bushing failure.

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2. Bruises

1. Damage Feature

There are linear or band-shaped pull marks along the circumference of the bearing bush on the inner surface of the bearing bush. It is an uneven wear, often caused by foreign objects. The test results show that foreign particles larger than 8 μm can cause wear. The length and depth of the linear pull marks and the walking path of foreign objects vary with the actual use.

2. Cause of Damage

(1) Mix foreign objects when assembling the bearing bush. The new bearing bush is coated with anti-rust oil, the purpose is to protect the bearing bush from rusting, and the anti-rust itself is harmless to the bearing bush. It must be cleaned, otherwise, it will cause wear and tear.

(2) The clearance between the journal and the bearing bush is small. When repairing and assembling, the gap between the bearing bush and the journal is small, which is easy to cause direct friction between the two working surfaces, and there is not enough lubricating oil.

(3) The lubricating oil is not clean. When the diesel engine lubricating oil is not replaced for a long time, it will inevitably lead to more mechanical impurities in the oil. The hard foreign particles mixed in the oil or attached to the surface of the bearing bush will not only accelerate the wear of the journal and the bearing bush like abrasives but will also be embedded in the soft material of the bearing bush, making the bearing bush itself a “grinding plate”, further Accelerates wear of journals.

(4) The surface of the bearing bush or the surface of the journal is rough. Due to the lowest repair quality, the surface roughness of the bearing bush and the journal is too large, which will lead to scratches on the bearing bush and the journal. The surface of some journals is poorly processed and is in an uneven state. When the diesel engine is working, the lubricating oil film is destroyed and the surface of the bearing bush is scratched.

Common crankshaft bearing bushes are burned, the alloy layer is peeled off, and the damage is scratched. The main forms of diesel engine bearing bush damage and its causes are analyzed in order to take effective preventive measures and prolong the service life of the bearing bush.

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