Sometimes seal cocking can be prevented through use of special designs; the non-standard“TAY”shaft seal is a perfect example. The TAY design features a flange on the outside diameter of the seal. crankshaft auto oil seals Price reduction.This flange helps to ensure that the seal seats properly against the housing face during initial installation Because the presence of the flange also helps prevent the possibility of subsequent misalignment, seal cocking concerns can be prevented.Seal cocking can also be prevented by the use of a properly designed or selected installation tool, and the right amount of force.Without the right tool, it’s easy to damage or distort the seal lip or case. rubber sealing.
Installation tools are generally made of steel and are designed to contact the seal near the O.D. (where the seal is most resistant to deformation). Pressing at the more vulnerable seal I.D. can distort the case and lead to leak age in service. The tool shown in Figure 6 is also advanta geous because it is designed to bottom out on the housing face, thus preventing seal cocking.crankshaft auto oil seals Price reduction.
Depending on the specifics of the application, the tool may also be designed such that it can keep pressing until the seal bottoms out or until the tool bottoms out against the shaft face
Depending on the application, the seal may be installed with the shaft already in place, or the shaft may be fitted into the assembly after the seal has been installed into the housing. Either way, it is necessary to protect the sealing lip from splines, keyways, burrs on the shaft, and improperly finished chamfering areas. shaft seal.
Use of a shield and/or lubrication can help. An assembly cone can be temporarily fitted onto or over the shaft to facilitate avoidance of potential hazards. If lip inversion(the turning over of the sealing lip due to friction during installation) is a concern,the cone can be oiled, or it can be made of a low-friction material such as PTFE.valve seal. Assembly cones must be routinely inspected to make sure they have no burrs or scratches.But even proper tools are no guarantee of good installation.Without the right amount of force, the seal will still not be installed properly. crankshaft auto oil seals Price reduction.
f installation is taking place in a factory,this force is often supplied by a hydraulic or pneumatic press.Use of such automated presses can eliminate guesswork by providing a constant force with which to push the seal into its housing.cap seal.
Because this force is closely controlled, the chances of inadvertently damaging the seal are greatly reduced. Factory installations also tend to be cleaner due to the ability to more closely control the work environment.crankshaft auto oil seals Price reduction.
In contrast, installations done in the field tend to be both dirtier (due to reduced environmental control) and less precise (due to forced reliance on less reliable installation aids).Tools such as those used in factories aren’t as common in the field. Installation force is often provided solely by hand-oper-ated arbor presses or soft-faced mallets The results are almost always less consistent than with automated equipment. And because of these inconsistencies, the chances of inadvertently damaging the seal are greater.crankshaft auto oil seals Price reduction.
In some cases, it may be helpful to apply a thin coat of bore sealant to the O.D. of the seal. This adhesive coating can help the seal stay in place (and form a more leak-proof seal) once it’s installed in the housing. Be careful, however, that any sealant you may use does not contaminate other parts of the seal, particularly the lip, or the surface of the shaft. Such contamination can impair or inhibit the functioning of the seal by blocking the proper development of the lip-shaft interface.
Following installation, it’s a good idea to double-check one last time that the proper functioning of the seal will not be impinged on by other parts of the assembly. Such impingement could lead to unplanned (and unwanted) friction, heat, and
wear, all of which can contribute to premature seal failure.You should also be cognizant of any treatments (such as painting or cleaning) to which the assembly in general(and the seal in particular) may be subjected. Unless
proper precautions are taken to shield the seal, post installation treatments can impair the seal’s functionality and thus hasten its failure. For example, you should be careful to ensure that a painted assembly does not
remain in the bake oven any longer than necessary to cure the paint; prolonged heat exposure can be very detrimental to the seal lip material. crankshaft auto oil seals Price reduction.
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