Cleaning
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20-00-02/70-00-01
SECTION II – CLEANING
1. Standard Cleaning Practices
A. General
WARNING: CLEANING PROCEDURES SHALL BE ACCOMPLISHED IN A WELL-LIGHTED, WELL-VENTILATED AREA WITH ADEQUATE SAFETY AND FIRE PREVENTION EQUIPMENT READILY AVAILABLE.
(1)
Compounds or materials, along with manufacturers addresses, are listed in SECTION VII, under Consumables.
(2)
Prior to cleaning record all identifying marks that could be removed by the cleaning and repainting process. Parts shall be remarked using same method and location. (Refer to Repair Method No. 414A - Marking of parts.)
(3)
Cleaning procedures for individual parts shall be consistent with good shop practices and the following procedures:
NOTE: Correct and thorough cleaning for all parts is important to the successful inspection, overhaul, and satisfactory operation after overhaul.
WARNING: USE CORRECT PERSONAL PROTECTION. SOLUTIONS USED FOR CLEANING ARE HAZARDOUS. AVOID INHALING FUMES, DUST, OR MIST. AVOID CONTACT WITH SKIN. AFTER PREPARATION, WASH HANDS AND FACE THOROUGHLY.
SOLVENT VAPORS ARE TOXIC AND FLAMMABLE. DO NOT INHALE VAPORS. OBSERVE FIRE PRECAUTIONS.
METHYL-ETHYL-KETONE (MEK) IS TOXIC AND FLAMMABLE. USE IN WELL-VENTILATED AREA. AVOID BREATHING FUMES OR CONTACT WITH SKIN. OBSERVE ALL FIRE PRECAUTIONS.
(a)
All metallic parts shall be cleaned to remove oil, grease, rust stains, and soiled areas. Flange areas, register diameters, and sealing surfaces shall be cleaned of oil, gaskets, and sealing compounds, if present. Remove adherent gasket or sealing compound residues using acetone (ASTM D 329) (SECTION VII) or methl-ethyl-ketone (MEK) (ASTM D470) (SECTION VII) and a soft or stiff fiber bristled brush.
(b)
Clean painted parts, but do not remove paint if paint is still serviceable.
(c)
Heat discoloration of metal surface is not objectionable; however, scale which may come loose and damage the unit shall be removed. Carbon residue and combustion products shall be removed.
(d)
Corrosion products, whenever they appear, shall be removed and the base metal treated to prevent further corrosion before re-assembly.
Cleaning
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Apr 1/05
20-00-02/70-00-01
(e)
Steel and 400 Series stainless steel parts require the application of corrosion-preventive compound (MIL-C-6529, Type III) (SECTION VII) after cleaning to prevent rust and corrosion.
(f)
Clean dissimilar materials as follows:
CAUTION: AN ASSEMBLY SHALL NOT BE CLEANED IN A SOLUTION THAT IS DETRIMENTAL TO ONE OF THE PARTS IN THE ASSEMBLY.
1 Analyze assemblies that combine dissimilar materials carefully and determine
types of materials.
CAUTION: BRASS AND BRONZE ALLOYS CAN BE AFFECTED BY CHROMIC ACID SOLUTIONS.
2 Clean assemblies containing brass, bronze, steel, and cadmium using methods applicable to the base metal involved.
3 Clean assemblies containing synthetic materials using methods that are non-destructive to the material.
(4) Place parts in clean cloth bags or equivalent containers after cleaning, for protection from contaminants. Ports and orifices shall be capped, plugged, or sealed.
NOTE: Alternate cleaning products may be used in place of those specified in Method No. 202A, Alkaline cleaning solutions and Method No. 202E, rust stripper. Selection and usage of alternate chemicals shall be performed in strict accordance with chapter 4. A. and B.
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