Supports and Grommets. Teflon hose requires a different kind of
support than that used for rubber hose.
However, the following
principles in using supports apply to both rubber and teflon hose.
Hose must be supported along its length at intervals of 24 inches or
less, depending on the size of the hose.
These supports, shown in
Figure 2-18, must be installed in such a manner that they do not
cause deflection of any rigid lines where they are connected.
When a hose is connected to an engine by a hose clamp, a support
must be placed approximately three inches from the connection, and at
least 1-1/2 inches of hose slack provided between the connection and
the engine, to keep vibration and torsion from damaging the
connections.
When a hose passes through a bulkhead, a grommet must be installed
in the bulkhead hole to provide support for the hose and to prevent
it from chafing. As an alternative, a cushioned clamp can be used at
the hole if the hole is large enough to provide adequate clearance
around the hose.
A hose assembly connecting two rigidly mounted fittings must be
supported firmly but not rigidly.
Lubrication.
The swiveling parts and mating surfaces-of hose
assemblies must be lubricated before installation.
This ensures
effective seating and tightening of the component parts.
Oil or
water can be used on all, types of fuel, oil, and coolant hose when
installation is made except for self-sealing hose which must never be
lubricated during installation. However, only oil or the operational
fluid of the system must be used on hydraulic and pneumatic hose.
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AL0907
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