LOW PRESSURE COMPRESSOR RUBS OR BINDS WHEN TURNED BY AND AND MORE THAN ONE HALF OF MAIN OIL PUMP MAGNETIC PLUG IS COVERED WITH METAL CHIPS.

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3 - 2 . TROUBLESHOOTING - CONTINUED

( 4 ) ES-31. LOW PRESSURE COMPRESSOR

h. LOW PRESSURE COMPRESSOR -

RUBS OR BINDS WHEN TURNED BY

CONTINUED

HAND AND MORE THAN ONE HALF OF

M A I N OIL PUMP MAGNETIC PLUG IS

C O V E R E D WITH METAL CHIPS.

This section contains troubleshooting to locate and correct the cause(s)

of low pressure compressor rubbing or binding when turned by hand, when

more than one half of the main oil pump magnetic plug is covered with

metal chips. The low pressure compressor is mechanically coupled to the

low pressure turbine rotor in the rear engine subassembly. If there is

damage to the low pressure compressor or position No. 1 or 2 bearing in

the forward engine module, or to the low pressure turbine rotor or

position No. 5 bearing in the rear engine subassembly, binding will be

felt when the low pressure compressor is turned by hand. The reduction

gearbox (RGB) oil return line feeds directly into the oil pump passage

that houses the magnetic plug. The only possible source of metal chips

on the oil pump magnetic plug is the RGB. These two systems are totally

independent of each other. The symptoms described above indicate two

separate failures. The art on this page provides an overview of the

systems described above. Refer to this page along with in-text art while

p e r f o r m i n g troubleshooting.

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