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747-400 MAINTENANCE MANUAL
(c) Wipe off any lapping compound residue and visually inspect the gearshaft area to make sure that no lapping compound particles have fallen into the gearbox.
NOTE: The lapping tool will remove only carbon buildup and is
____ not recommended for the repair of scored gearshaft seal faces.
G. Optional Cleaning Procedure
S 187-013-N00
CAUTION: ALKALINE GEL MAY CAUSE DAMAGE TO PROTECTIVE COATINGS ON
_______ ALUMINUM PARTS. IF ANY ALKALINE GEL GETS IN CONTACT WITH ANY ALUMINUM SURFACE, WIPE IT OFF IMMEDIATELY WITH A CLEAN, DAMP, UNSIZED CHEESE CLOTH FOLLOWED BY A WIPING WITH CLEAN, DRY, UNSIZED CHEESE CLOTH.
(1)
Pack the area around the gearshaft with clean unsized cheese cloth.
S 037-009-N00
(2)
Remove light carbon deposits (stains) as follows:
(a)
With a paint brush of appropriate size, apply a thin coat of alkaline gel directly to the gearshaft face seal.
(b)
Let the gel work for a minumum of 15 minutes.
(c)
Wipe the gearshaft seal face with a dry, clean, unsized cheese cloth (P05-038). 1) If necessary, reapply alkaline gel to the gearshaft face
seal followed by a wipe with a clean, dry, unsized cheese cloth (P05-038).
(d)
Use a clean, damp, unsized cheese cloth (P05-038) to wipe the entire area where the alkaline gel was applied and follow with a wipe with a dry, unsized cheese cloth (P05-038).
S 037-010-N00
(3)
Remove Heavy Carbon Deposits As Follows:
(a)
With a paint brush of appropriate size, apply a thin coat of alkaline gel directly to the gearshaft seal face. 1) Let the gel work for a minimum of 20 minutes to allow the
carbon deposits to soften.
(b)
Scrape off the softened carbon deposits using a plastic scraper. 1) Wipe the excess off with a clean, dry, unsized cheese cloth
(P05-038). 2) Repeat this procedure until only a thin layer of carbon deposit remains.
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(c)
(d)
(e)
(f)
(g)
(h)
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747-400
MAINTENANCE MANUAL
Use a clean, damp, unsized cheese cloth (P05-038) to wipe the entire area were the alkaline gel was applied and follow with a wipe with a clean, dry, unsized cheese cloth (P05-038).Pack the area around the gearshaft with clean unsized cheese cloth (P05-038) to prevent any lapping compound to fall into the gearbox. 1) Make sure that the gearshaft seal is fully exposed.Using the appropriate lapping tool, remove any remaining carbon deposits from the gearshaft seal face at the point of interface with the carbon seal.
NOTE: Remove the starter coupling prior to use of the lapping
____ tool PWA 27443.
1) Use the lapping tool with a standard 0.375 inch (9.525 mm) square drive "T" handle, or equivalent.
2) Use lapping compound P05-006 to lap the gearshaft with the tool by hand with axial pressure applied to obtain the desired effect.
3) Clean and recharge the lapping tool with fresh lapping
compound as necessary.Prior to final lapping, it may be necessary to resurface the tool by lapping it on the appropriate flat plate to restore the tool face wavyness to within 0.0003 inch (0.0076 mm) and surface finish of 10 microinches (0.25 micrometers).Wipe the lapped gearshaft seal surface and the adjacent areas with a clean, dry unsized cheese cloth (P05-038) and carefully remove the cloth previously inserted around the gearshaft.Wipe off any lapping compound residue and visually inspect the gearshaft area to make sure that no lapping compound particles have fallen into the gearbox.
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