RE: JJ1400 14lb Turbine Stripdown/Rebuild
Next removing the front spinner nut. Before you do this, if you want to be able to re-assemble without balancing you will need to mark the position of the compressor on the shaft. First mark the spinner nut to compressor position, then after the nut has been removed, mark on the front of the compressor, on the threads and on end of the shaft.
The nut needs a 12mm spanner and has a left hand thread. The serrated/splined nut on the turbine wheel at the back is 8mm ring spanner. The spinner nut should loosen easily enough. Note again left hand thread on aluminium spinner nut.
I had to give the end of the shaft a slight tap to free it from the compressor, you can then withdraw the turbine wheel/shaft assembly.
The NGV then simply pulls out of the end of the combustion chamber and the combustion chamber itself is removed by pushing the ends of the fuel and gas pipes out of the diffuser.
Unscrew the front cover to release the compressor wheel and spacer, Note the spacer and its orientation.
Pic 1 Turbine wheel and shaft removed, also shown is rear bearing on shaft behind turbine wheel
Pic 2 Combustion chamber separated from NGV and Diffuser/shaft tunnel
Pic 3 Front cover separated from diffuser releasing compressor wheel and spacer.