Expansion Block/Orifice Tube: Service and Repair
EXPANSION (ORIFICE) TUBE REPLACEMENTREMOVAL PROCEDURE
TOOLS REQUIRED
J 26549-E Orifice Tube Remover.
1. Remove the air cleaner.
2. Recover the refrigerant from the system. Refer to Refrigerant Recovery and Recharging. Service and Repair
3. Remove the evaporator tube from the evaporator.
4. Remove the O-ring seal.
5. Use the J 26549-E in order to remove the orifice tube.
6. If you have difficulty removing a restricted or plugged expansion (orifice) tube, use the following procedure:
6.1. Remove as much of any impacted residue as possible.
NOTE: If the system has a pressure switch near the expansion (orifice) tube location, it should be removed prior to heating the pipe to avoid damage to switch.
6.2. Carefully apply heat with a heat gun (hair dryer, epoxy dryer, or equivalent) approximately 7 mm (0.25 in) from the dimples on the inlet pipe. DO NOT overheat the pipe.
6.3. While applying heat, use the J 26549-E in order to remove the orifice tube.
6.4. Use a turning motion along with a push-pull motion in order to loosen the impacted expansion (orifice) tube.
6.5. Remove the expansion (orifice) tube.
INSTALLATION PROCEDURE
IMPORTANT: Install the shorter screen end of the expansion (orifice) tube into the evaporator first.
1. Use the J 26549-E.
2. Coat the new O-ring seal with 525 viscosity refrigerant oil.
3. Install the new O-ring seal.
NOTE: Refer to Fastener Notice in Service Precautions.
4. Install the evaporator tube to the evaporator.
Tighten
Tighten the evaporator tube to 27.5 N.m (20 lb ft).
5. Evacuate and charge the system. Refer to Refrigerant Recovery and Recharging. Service and Repair
6. Ensure that no leaks exist in the system. Refer to Leak Testing. Leak Testing
7. Install the air cleaner.