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Main factors and solutions for oil seal leakage

Update:2018-10-31

Main factors causing oil seal leakage

The main reason of oil leakage is that the seal of oil seal is not strict. When the shaft wears and forms a groove, even if the oil seal is not sealed when changed oil seals, the contact pressure between sealing lip of oil seals and the shaft is lowered, and the interference between the diameter of the oil seal lip and the shaft diameter after installation is too small. Taking the crankshaft oil seal of diesel engine as an example, Analysis of the main reasons for its lack of sealing:

1. The quality of the oil seal is poor.

2. Poor quality of the shaft or bearing

3. Improper use and maintenance

4. Incorrect installation

5. Improper storage, affected by environmental pollution

Countermeasures that oil seals leak oil due to lack of sealing

1. Master and identify the basic knowledge of counterfeit products, purchase standard oil seals

2. When installing, if the outer diameter of the shaft diameter is low or there are rust spots, rust, burrs, etc., use a fine sand cloth or oil stone to smooth it; apply clean oil or grease at the corresponding position of the oil seal lip or shaft diameter. 

Apply sealant to the outer ring of the oil seal, wrap the key groove on the shaft with hard paper to avoid scratching the lip of the oil seal. Use a special tool to rotate the oil seal inward. Do not break forcibly to prevent the oil seal from deforming, or squeeze the spring and fail; 

if the lip is turned over, the spring is detached, and the oil seal is skewed, it is removed and reloaded. It should be noted that when the shaft diameter is not worn and the oil seal spring is strong enough, do not tighten the inner spring without authorization.

3. The oil seal applied to the machine should be inspected, maintained and maintained when the working conditions are poor, the temperature difference is large, the dust is too much, and the vibration of the machine is frequently changed.

4. If the shaft diameter and bearing wear are serious; oil seal rubber aging or spring failure, etc., repair and replace the corresponding parts in time.

5. For parts or assemblies that are not normally heated, the fault should be eliminated in time; avoid mechanical overload operation to prevent the temperature of the oil seal lip from rising, rubber aging, early lip wear and so on.

6. Always check the oil level of the engine oil. If there are too many impurities in the oil, the alloy oil should be completely replaced when there is alloy powder or metal iron filings. The oil brand and quality should be changed according to the season requirements. It is recommended to add a seal to the oil.