TASK 70-21-21-110-039
1 . General.
A.The carbon remover C04-263   is a water base carbon remover. This process replaces the previous two-phase solvent-based system.
B.The solution is used for removing light carbon deposits and fuel/oil residue from engine parts fabricated from metal including aluminum, magnesium, carbon steel, stainless steel and all heat resistant alloys.
NOTE:
TASK 70-21-08-110-006, Cleaning Method No. 8 - Carbon Removal from All Materials, is a heavy duty (hot bath) alternative to this procedure. Cleaning Method No. 8 will easily remove paint or coked-on carbon deposits.
2 . Equipment.
Subtask 70-21-21-110-391
A.The following equipment is required for the application of this process.
(1)Steel tank equipped with heater capable of heating solution to 140°F (60°C).
NOTE:
Mild steel tank can be used, but stainless steel is preferred.
(2)Expanded mesh steel basket.
(3)Hot water dip tank.
(4)Stiff bristle and stainless wire brush.
3 . Materials.
Subtask 70-21-21-110-392
A.The following materials are required for this process:
 
Material
Consumable No.
Temperature
 
Engine oil
C02-019  
 
Lubricating oil
C02-021  

 
Preservation oil
C02-050  

 
Preservative
C02-054  

 
Storage Preservative
C02-055  

 
Inhibitor
C02-056  

 
Carbon Remover
C04-263  
110°-140°F (43°-60°C)
4 . Procedure.
Subtask 70-21-21-110-393
WARNING:
CARBON REMOVER CAUSES EYE IRRITATION. MAY CAUSE SKIN IRRITATION. HARMFUL IF SWALLOWED.
A.Place parts in an expanded mesh basket, or suspend by a wire into the carbon remover.
NOTE:
To extend the life of this carbon remover, parts may be pre-cleaned using the following procedures:
TASK 70-21-22-110-042, Cleaning Method No. 22 Light Duty Aqueous Cleaning - Method No. 1, or
TASK 70-21-22-110-050, Cleaning Method No. 22 Light Duty Aqueous Cleaning - Method No. 2.
B.Ensure that all parts are below the surface of the liquid.
C.Soak the parts until the carbon deposits are loosened (30 minutes to 2 hours, depending on the hardness and extent of the deposits to be removed).
D.Raise the parts slowly and allow time for parts to drain.
E.Pressure spray rinse part over the solution tank. Dip into cold water and pressure rinse again.
F.Rinse with (or immerse in) hot water at minimum 150ºF (66ºC).
G.If necessary, scrub with a stiff, bristle brush (a wire brush may be used for steel, stainless steel, and all heat resistant alloys) under running hot water to remove localized deposits of loosened carbon.
H.Rinse again by immersion in hot water at minimum 150ºF (66ºC).
WARNING:
WHEN USING COMPRESSED AIR FOR CLEANING, COOLING, OR DRYING, DO NOT EXCEED 30 PSIG (207 KPA). WEAR EYE PROTECTION AND DO NOT DIRECT COMPRESSED AIR AT SELF OR OTHERS.
CAUTION:
PARTS MUST BE THOROUGHLY DRY PRIOR TO FPI INSPECTION. WATER ON THE PARTS MAY DEGRADE THE SENSITIVITY OF THE PROCESS, ESPECIALLY FOR THE WATER WASHABLE PENETRANT PROCESS.
I.Dry the part by one of the following two methods.
(1)Flash dry the part as follows:
(a)Keep the part submerged until the part reaches a temperature sufficient to provide for flash drying.
NOTE:
The time required will vary with part size, water temperature and tank size. Proper flash drying is indicated by seeing the water on the surface of a part start to "flash" or "whisk" off as the part is being removed from the hot water tank.
(b)Remove the part from the water. The part will flash dry as soon as it is removed from the water. Use repositioning, suction, blotting with a clean, absorbent material, or by blowing off with an oil and water filtered shop air gun to remove excess water.
(2)You can substitute drying the part in an air re-circulating oven for the dwell time in the hot water.
(a)Remove the part from the water. You can remove excess water by repositioning, suction, blotting with a clean absorbent material, or blowing the water off with an oil and water filtered shop air gun.
(b)Move the part to the oven and dry at 200°F ± 25°F (93°C ± 14°C) until the part reaches the oven temperature and all traces of surface water are removed.
J.If necessary, treat steel parts to prevent corrosion per TASK 70-60-00-620-001, Preservation of Engine Parts.