scavenge, and sump vent. We will discuss these
subsystems and their components in chapter 2.
Three types of oil seals are common to the
GTEs, the lip-type seal, the labyrinth/windback,
and the carbon ring.
LIP-TYPE SEAL.--The lip-type seal (fig.
1-36) is used to prevent leakage in one direction
only. A metal frame is covered with a synthetic
material, usually neoprene. The neoprene is
of the neoprene will allow the shaft to slide
through the seal. The seal is molded with a lip to
retain a spring around the center. The spring keeps
a snug fit around the shaft. The construction of
Figure 1-36.--Lip-type seal.
the lip-type seal allows for some very slight
misalignment and for axial movement of the
Figure 1-37.--Labyrinth/windback seal.