3016792 6D170 Engine Crankshaft Front And Rear Oil Seals 6240-21-4250 Excavator Seal Kits

3016792 6D170 Engine Crankshaft Front And Rear Oil Seals 6240-21-4250 Excavator Seal Kits

Specifiion

 
 
Description
 

Operating temperatures for engine oil seals vary widely, depending on engine design and loion within the engine. Typically, the rear crankshaft seal is subjected to much higher temperatures than the front seal. Oil sump temperatures vary considerably, depending on provisions for oil cooling. This allows use of hydrogenated nitrile (HNBR), silicone, or acrylic elastomers for some seals in relatively low-temperature environments (120–140°C or 250–284°F). Standard fluoroelastomers (FKM), bisphenol-cured VDF/HFP/TFE terpolymers with 68–69% fluorine content, perform well in oil service up to about 160°C (320°F). More resistant fluoroelastomers are necessary for reliable long-term performance in more severe environments.
Natural rubber seals and rings are suitable for air, acetylene, cold ammonia gas, alcohols, inorganic salt solutions, sugar liquors, castor oil, ethyl chloride, ethylene glycol, formaldehyde, formic acid, hydrochloric acid, water, sea water, wines, and spirits. Nitrile rubbers are suitable for organic solvents, petrol, aviation turbine fuels, hydraulic oils, transformer coolants, mineral oils, etc. High acrylonitrile and medium acrylonitrile content nitrile rubbers are available which can be employed based on the functional requirements of seals. Blends of synthetic rubbers are also employed in formulating a compound depending on specific performance requirements. Neoprene rubber seals are also suitable for the fuels mentioned above. Nitrile seals are suitable for high aromatic liquids. For extreme temperatures, fluoro-rubbers (e.g., Viton) and silicone rubber seals are suitable. Thiokol (polysulfide) rubbers are suitable for esters, ketones, lacquers, and UV light in the case of static seals.

 
Characteristic

1.Low friction, high efficiency.

2.Superior sealing effect in high pressure.

3.Can be installed onto a solid piston without tools

4.Low density; High strength;

5.Low thermal expansion

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