Figure 4-35. Proper Procedure for Pulling
wrenches is impractical when compared with the
Care. Observe the following practices for the
care and upkeep of wrenches:
Clean all wrenches after each use.
Wrenches that come in sets should be
returned to their cases after use.
Apply a thin film of oil to the metal parts
of all wrenches before storing them.
For long-term storage, the wrenches
should be covered with a rust-preventive compound and
carefully stored in a dry place.
Spanner Wrenches. Many special nuts used in
propeller systems are made with notches or holes cut
into the outer edge or the face of the nut. These nuts
are designed to be driven with spanner wrenches.
Types. Spanner wrenches can generally be
classified as one of two types: solid and adjustable.
Solid spanner wrenches. The following
paragraphs describe the various types of solid spanner
Hook spanner. Nuts with notches cut
into the outer edge are driven with the hook spanner, as
shown in figure 4-36. This wrench has a curved arm
with a lug or hook in the end. This lug fits into one of
the notches of the nut, and the handle is pulled to
tighten or loosen the nut.
Figure 4-36. Hook Spanner Wrench
Pin spanner. The pin spanner,
shown in figure 4-37, has a pin in place of the hook.
This pin fits into a hole on the outer edge of the nut.
Figure 4-37. Pin Spanner Wrench
Face pin spanner.
spanners are designed so that the pins fit into holes in
the face of the nut, as shown in figure 4-38.
Figure 4-38. Face Pin Spanner Wrench
spanner wrenches are sized for specific sizes of nuts.
The adjustable spanner wrench, shown in figure 4-39,
has a pivoting end which allows the wrench to fit several
nut sizes. The type of wrench shown is a hook spanner,
and is used the same way as the solid hook spanner.
Pliers, Retaining Ring. The retaining ring
pliers (snap ring) are used to remove internal and
external retaining rings. It is shown in figure 4-40.