FITTING 1432933 - Caterpillar

Machines With Air-To-Air Aftercoolers or Oil-To-Air Oil CoolersSUPPLEMENT: 10/17/77SERVICE MAGAZINE, SEPTEMBER 5, 1977, PAGE 5, "Field Repair of Cooler Cores Made of Aluminum".There is a recommendation in this article that carbon tetrachloride can be used to clean small repair areas of the cooler core. This is wrong. Do not, under any circumstances, use carbon tetrachloride. It is highly toxic and hazardous to your health.--------------- END SUPPLEMENT ---------------Some cooler cores that are made of aluminum which have been damaged or leak, can be repaired in the field. Repairs can be made with weld or with epoxy. The weld procedure is normally the best for the heavier parts of the cooler cores such as the end, top or bottom tanks, the connections or the support brackets. The epoxy procedure is normally the best for the tube and fin part of the cooler core.
Procedure to Clean Cooler Core Before Repair Is Made.
Remove all paint, oil, grease or dirt from the area that needs repair. A small knife, file, emery paper, wire brush and/or solvent can be used.
Do not use a cleaner that will cause a chemical reaction with aluminum. These types of cleaners will damage the core.
Trichlorethylene or chlorothene nu can be used as solvents to clean the cooler core. Flush the internal part of the cooler core with a solvent. If the area to be repaired is very small the internal parts can be cleaned by pushing either acetone or carbon tetrachloride through the hole.
Weld Procedure
Use 4043 welding rod and tungsten inert gas welding process. Any part of the cooler core can be repaired with this procedure, but it is normally easier to weld on the heavier sections of the cooler core.
Epoxy Procedure
Use a two part epoxy such as Devcon Special-F Repair Kit-aluminum filled, Devcon EK-4 Kit-unfilled, or an equivalent epoxy.
Do not mix the epoxy until the cooler core is ready for the repair. If additional parts such as a screw or a screen are needed to make the repair, be sure that you have those parts ready. Do not mix more of the epoxy than is needed to make the repair.The epoxy in The Special-F Repair Kit has a cure time (amount of time needed for the epoxy to completely dry) of approximately 8 hours and a pot life (amount of time that epoxy can be used after it is mixed) of approximately 20 to 30 minutes. This type of epoxy is normally used on larger repairs.
The epoxy in the EK-4 Kit will set (become rigid but not completely hard) in approximately 15 minutes or it has a cure time of approximately 20 minutes when a 100 Watt light bulb is used to give heat to the epoxy. The epoxy in the EK-4 Kit has a pot life of approximately 5 to 6 minutes. This type of epoxy is normally used on smaller repairs.
The epoxy will take longer to dry if the temperature is less than 65°F (18°C). A 100 Watt light bulb can be used to make the