Specifications

Section 3
3-20
TOYOTA Technical Training
A quick-disconnect type fitting uses a plastic clamp lock to connect the
t
ube endings. This type of fitting has no threads. One tube end has
an O-ring that fits into a mating tube end. The plastic clamp keeps the
tube ends together to create a leak-free seal. To service the system
(e.g. evacuating the system — the system must be empty), a special
remover tool is used to release the clamp.
With threaded or threadless tube fittings, in order to ensure the proper
seal under high system pressures and temperatures, A/C O-rings rest
within a machined ar
ea instead of just being compressed between two
surfaces like a common gasket. In order to ensure a correct seal, the
O-ring must be the correct one. An O-ring that looks about right may
make a joint impossible to assemble without damage or may result in a
leak. O-rings should be lubricated with the correct system refrigerant oil
to prevent nicks or scratches during assembly.
With threaded fittings, the correct tightening torque is important for a
proper seal. Too little torque will not provide enough pressure on the
O-ring to seal and may allow the fitting to move. Too much torque may
distort the fitting and make it difficult to disassemble later. Torque
specifications for the different types and sizes of fittings are described in
the
Vehicle Repair Manual .
In order to apply the right tightening torque, the threads must be
lubricated with oil. To prevent twisting and to relieve tension on rigid and
flexible lines, hold one fitting stationary with an open-end or flare-nut
wrench while tightening the other fitting. In the case of a threaded tube
fitting, the male end should be held while tightening the female threaded
nut.
Quick-Disconnect
Fitting
• Clamp holds tubes
in place.
• See removal SST
page 4-11.
Note:
A/C Tube
Note: When assembled,
clamp can still rotate.
Clamp
A/C Tube
Fig. 3-23
752f323
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