Removing and Installing Locating Ring -MAN B&W NA 57 TC

Tools Required

1. Claw spanner
2. Protection sleee 
3. Bracket
4. Hexagonal nut
5. Threaded rod
6. Extraction rod
7. Open end wrench

Starting Position

Either silencer or air-intake casing and compressor casing are removed or only air-intake socket, spacer ring and insert. Impeller and cover removed.

SEQUENCE OF OPERATION
Removing

1. Screw off ring nut, using spanner and withdraw locating ring.
2. Slip protection sleeve over rotor shaft to protect shaft and bearing bore.
3. Screw in extraction ring.
4. Screw threaded rods into extraction ring.
5. Clamp bracket with hexagonal nuts to bearing casing.
6. Remove protection sleeve.
7. Extract locating ring by screwing hexagonal nuts onto the threaded rods and tightening them evenly.

Note: The protection sleeve must be removed before the locating ring is extracted. The nuts should be tightened evenly at the same time. 

Installation

1. Slip locating ring over turbine rotor.
2. Draw up ring nut until locating ring seats against the step shaft, using claw spanner.

Note: Balance marks on locating ring and turbine rotor must be in alignment.

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