SEAL 6B8238 - Caterpillar

1. There must be a minimum radial (running) clearance between the wheel (turbine) and guide assembly (stator). Check the clearance between the wheel (turbine) and guide assembly (stator) as follows:
Typical Examplea. Put wheel (turbine) (1) on a smooth, flat surface. Install tooling (A) at four positions around the wheel (turbine) as shown.
Typical Exampleb. Put guide assembly (stator) (2) in position in the wheel (turbine). Make sure the welded fins in the guide assembly (stator) are not in contact with tooling (A).
Typical Examplec. Put tooling (B) against the guide assembly (stator) as shown. Move the guide assembly (stator) toward tooling (B) until it makes contact with the inside diameter in the wheel (turbine). Adjust the dial indicator until it is on zero. Slide guide assembly (stator) (2) 180° away from tooling (B) until it makes contact with the other side of the wheel (turbine) (1). Make a record of the dimension measured.d. Make this check at several locations around the wheel (turbine). Make a record of each dimension measured. The largest dimension measured is used for the clearance between the wheel (turbine) and guide assembly (stator). The total clearance measured across the diameter must be 0.30 to 0.46 mm (.012 to .018 in.) with a maximum permissible clearance of 0.76 mm (.030 in.). The radial (running) clearance is half of the dimensions measured.2. There must be a minimum radial (running) clearance between the guide assembly (stator) and impeller. 3. Check the clearance between the outside diameter of the inner flange for the guide assembly (stator) and the inside diameter of the impeller flange as follows:a. Put impeller (3) on a flat smooth surface as shown. Install two 12.7 mm (.5 in.) diameter rods (4) 45.7 cm (18 in.) long, across the impeller as shown.
Typical Exampleb. Put guide assembly (stator) (2) in position on the rods.
Typical Examplec. Put tooling (B) in position as shown. Slide the guide assembly (stator) toward tooling (B) until it makes contact with the inside diameter of the impeller. Adjust the dial indicator until it is on zero. Keep an even pressure on the guide assembly (stator) when it is moved. Move the guide assembly (stator) away from tooling (B) 180° until it makes contact with the other side of the impeller. Make a record of the dimension measured. Make this check at several locations around the impeller and guide assembly (stator). Make a record of each dimension measured. Turn the impeller around tool (B) and the guide assembly (stator) when different locations are measured.d. The largest dimension measured is used for the clearance between the guide assembly (stator) and impeller. The total clearance measured across the diameters must be .030 to 0.46 mm (.012 to .018 in.) with a maximum permissible clearance of 0.76 mm (.030 in.). The radial (running) clearance is one half of the dimensions measured.