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Removal of Compressor Wheel-MAN B&W NA 57 Turbocharger

5:01 AM ,
Tools Required
  1. Oil pump
  2. Bush
  3. Clamping piece
  4. Hexagonal screw
  5. High pressure pipe
  6. Sealing sleece
  7. Seal ring
  8. Open end wrenchs
STARTING POSITION
Either the silencer or the intake casing and oil tank and compressor casing have been removed.

Caution! Check the flexible high-pressure pipe for damage every time before it is used. Under no circumstances whatsoever is an even lightly damage high-pressure pipe to be used.

hydraulic pressure applying to unlock compressor wheel
Oil pump

SEQUENCE OF OPERATION
  1. Unscrew and remove the magnet shaft in order to prevent it being damaged. Unscrew nut, take off the claw sleeve and remove the fitted feather key.
  2. Refit the claw sleeve and screw on the nut far enough until gap between compressor wheel and claw sleeve is about 10-15 mm(for MAN B&W 9L 58/64). The claw sleeve serves as a stop when pressing off the compressor wheel. Screw sealing sleeve into the center bore of the shaft and secure oil pump with bush, clamping piece and hexagonal screws to the bearing casing.
  3. Connect high pressure pipe to bush and sealing sleeve.
  4. Unscrew the cylindrical feeder of the oil pump, immerse the mouthpiece in clean lube oil and pull out the piston using the eyebolt. For venting, hold up the mouthpiece and press the ball inwards, then screw the oil feeder back onto the pump.
  5. With the T-screw in pump open, pump unit bubble free oil exits. After closing the T-screw again continue pumping unit pumping becomes noticeably more difficult. If the compressor wheel does not jump off immediately, wait a couple of minutes in order that the oil can spread in between shaft and conical sleeve. Then continue pumping again until the compressor wheel and the conical sleeve. Then continue pumping again until the compressor wheel and the conical sleeve jump off against the claw sleeve. When this happens, they are released.
  6. Remove nut and claw sleeve. Remove feather keys if applicable.
  7. Using the lifting device, firmly secure compressor wheel and conical sleeve to the rope and hang the rope onto hoist.
  8. Pull off the compressor wheel with the conical sleeve in an axial direction and deposit on a wooden base.
Now the bearing casing is accessible for inspection of the guide bearing(locating bearing).