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3-2. No attempt shall be made to include overhaul pro-cedures for the various trade accessories. These ac-cessories are covered in overhaul manuals published bytheir respective manufacturer. Only such assembly and disassembly as required by engine installation will be covered.
3-3. Just prior to or immediately after removing the engine from the airframe, remove the oil drain plug and drain the oil from the engine.
3-4. Attach the engine lifting cable to the engine and remove from the airframe.
3-5. Attach the engine overhaul adapter (ST-165) on pro-peller flange. Mount the dynafocal mounting adapters(64898) on the engine mounts and place mounting ring(64759) on mounting adapters.
3-6. Place the skid (ST-278) on engine overhaul stand
(ST-162)and lower engine into position on skid and stand. Remove the lifting cable. Specific disassembly instruc-tions are contained in the applicable section for each com-ponent.
3-7. Inasmuch as visual inspection should be made while disassembling and immediately after disassembly, all in-dividual parts should be laid out in an orderly manner as
they are removed from the engine. No cleaning operationshould be performed until this initial visual inspection has been completed. All loose studs, cracked cooling fins,
loose or damaged fittings, and the like, should be carefully noted and tagged to prevent their being overlooked dur-ing regular inspection.
CLEANING

3-8.It is imperative to clean all engine parts thoroughly to facilitate inspection. Two processes are involved in clean-ing engine parts; degreasing to remove dirt and sludge(soft carbon) and the removal of hard carbon by decar-bonizing, brushing or scraping and grit-blasting.
3-9. Degreasing. Degreasing is accomplished by immers-ing or spraying the part in solution of white furnace oil (38-40 specific gravity) or a suitable commercial solvent such as Varsol or Perm-A-Chlor. Operators are warned against the use of solvents with which they are un-familiar, since there are may products on the market which are injurious to aluminum and magnesium. Ex-
treme care must be exercised if any water-mixed degreas-
ing solutions containing caustic compounds or soap are
used. Such compounds, in addition to being potentially

dangerous to aluminum and magnesium, may become im-
pregnated in the pores of the metal and cause oil foaming
when the engine is returned to service. When using water-
mixing solutions therefore, it is imperative that the parts
be completely and thoroughly rinsed in clean boiling
water after degreasing. Regardless of the method and
type of solution used, coat and spray all parts with
lubricating oil immediately after cleaning in order to pre-
vent corrosion.
3-10.Removal of Hard Carbon.While the degreasing solu-tion will remove dirt, grease and soft carbon, deposits of hard carbon will almost invariably remain on many in-terior surfaces. To facilitate removal, these deposits must first be loosened by immersion in a tank containing a decarbonizing solution (usually heated). A great variety of commercial decarbonizing agents are available, includingsuch products as Gunk, Penetrol, Carbrax, Super-Chemaco, Gerlach No. 70, and many others. Decar-bonizers, like the degreasing solutions previously men-tioned, fall generally into two categories, water-soluble
　
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