GE MS6001B, Maintenance Instructions Manual

Page: 195 / 370

Combustion Inspection — Inspection Procedures Inspection and Maintenance — GEK 107048
CI-I-9
Inspect and Clean the Secondary Fuel Nozzles
1. Inspect parts for major carbon buildup and for plugged slots or orifices prior to cleaning. If oil or
water has leaked into any of the gas passages, the resulting deposits must be removed before reas-
sembly. Record observation on Inspection Form PGS/GT–FF–WS28.
2. The cleaning procedures for the secondary nozzle parts are the same as those described for the pri-
mary nozzles.
3. Inspect the outer diameter of the gas tip where it contacts the center body for wear. If metal loss
in this area is 0.015 inch or more, contact your General Electric Field Service Representative for
information concerning repair of this part.
Operation 4 — How to Reassemble the Secondary Fuel Nozzles
1. Since plastic coverings are often used to protect the surfaces of new or spare parts, be sure that
all plastic material is removed before reassembling the nozzle. Ensure that no plastic material re-
mains lodged on inside surfaces.
2. Do not use Teflon tape or liquid sealant anywhere in the fuel nozzle assembly.
3. Ensure that all gaskets are new. NEVER REUSE AN OLD GASKET.
4. Use Fel–Pro C–102 anti–seize compound on all threaded parts.
5. During reassembly of the fuel nozzle, use the torque values specified on the fuel nozzle assembly
drawing in the Parts Lists and Drawings Volume of the service manuals.
6. Use a torque wrench with a range from zero to approximately 20 percent above the maximum
torque required for assembly. The accuracy should be within
±
5 percent.
7. Using a suitable holding fixture, secure the fuel nozzle body with the fuel nozzle orifice pointing
up.
8. Wipe anti–seize compound lightly on the threads of the transition piece assembly and on the corre-
sponding threads in the fuel nozzle body.
9. Carefully install a new metal O–ring into the groove in the transition piece making sure that they
are centered by the shoulder outside the gasket surfaces.
10. Install a new lock plate on the transition piece and screw the transition piece onto the body thread.
Using a socket wrench, torque the assembly to the value specified on the assembly drawing.
CAUTION
Torque the assembly only once. Under no circumstances
should the assembly be loosened and retorqued without
replacing the O–ring.