L.E.C Technical Bulletin
PTFE Oil Seals
* Important fitting
information *
1. Only remove PTFE oil seals from their protective
packaging immediately before installation, to protect them from dust and other
contamination.
2. The sealing lip of PTFE oil seals is protected by a
plastic sleeve, which can normally be used as an assembly aid. Therefore, the
sleeve should remain in place until the seal has been installed.
3. If the seal is to be installed without the sleeve, use
the special tool provided by the manufacturer.
4. Both the PTFE sealing lip and the shaft surface must be
completely dry. Do not use any grease or oil.
5. The shaft may not exhibit any sharp-edged chamfers - if
necessary, have the edges removed by an engine expert.
6. The shaft surface must be in a perfect condition - also
here, possible damage must be repaired by an expert.
7. Position the assembly sleeve with the PTFE oil seal on
the shaft.
8. Make sure that the
sealing ring is aligned correctly - the sleeve must be located so that the seal
can be pushed onto the shaft smoothly.
9. Push the sealing ring onto the shaft with an even motion.
10. When replacing, the PTFE lip of the new seal should not
run in the same position as the old one.
11. You can now remove the assembly sleeve.
12.Do not start the engine sooner than four hours after
installation - this permits the new sealing lip to adapt perfectly to the
shaft.
The most
frequent cause for failure is damage to the PTFE sealing lip during assembly.
If the seal is installed without the help of a sleeve or special tool and is
shifted or even turned inside out, reliable sealing will hardly be possible.
Similarly, the use of oil or grease - as with classical oil sealing rings -
will result in total failure of the PTFE oil seal immediately after
installation.