Domonic Moxon, Senior Product Manager, FAI, explains how this new technology works and why problems can occur.
As part of its extensive product range, FAI offers a large range of oil seals that use the latest technology PTFE (Polytetrafluoroethylene) material on the seal lip. This modern material creates a perfect low friction seal between the rotating shaft and the external environment, yet PTFE sealing surfaces can be damaged if incorrect installation takes place.
The method by which the PTFE lip is produced and cut creates a ‘memory’ behaviour, causing the material to constantly try and return to its original shape. This material creates a tight seal against the shaft and, if damaged on installation, severely impacts the integrity of the seal.
As you can see from the diagram (see image, left), each PTFE oil seal contains a plastic sleeve that is designed to maintain the tolerance and protect the sealing lip. It is also an integral part of the installation process. This sleeve MUST NOT be removed before fitting as it will disengage by itself as part of the installation.
INSTALLATION TIPS
