K 1500 Truck 4WD V8-350 5.7L (1986)
Catalytic Converter: Service and Repair
Fig. 33 Aspirator installation
Fig. 34 Vibrator installation
CATALYST REMOVAL
Monolith type converters are not serviceable. The following procedure applies only to pellet type catalytic converters.
1.
Raise and support vehicle.
2.
Install aspirator, Fig. 33, and connect an air line to aspirator, creating a vacuum in the converter, thereby holding pellets in place when fill plug is
removed.
3.
If converter is equipped with threaded fill plug, use a 3/4 inch Allen wrench and remove fill plug from converter.
4.
If converter is equipped with pressed fill plug, lightly drive a small chisel between converter shell and fill plug until fill plug distorts. Remove fill
plug with pliers. Do not pry fill plug from converter, since damage to fill plug sealing surface may result.
5.
Install vibrator and catalyst container, then adapter J-25077, if equipped with pressed fill plug, Fig. 34.
6.
Disconnect air line from aspirator and connect to vibrator. Catalyst will now drain from converter.
7.
When all catalyst has been drained from converter, remove container and discard the used catalyst.
CATALYST INSTALLATION
1.
Fill container with recommended replacement catalyst and install fill tube extension to fixture.
2.
Connect air line to aspirator and vibrator, then secure container to fixture.
3.
When catalyst stops flowing, disconnect air line from vibrator making sure catalyst has filled converter flush with fill plug. Add catalyst, if
necessary.
4.
If equipped with threaded fill plug, apply suitable anti-seize compound to threads and install into converter. Torque fill plug to 50-60 ft. lbs.
5.
If equipped with pressed fill plug, install service fill plug kit with dished fill plug facing outward.
6.
Disconnect air supply from aspirator, then remove aspirator from converter.
