PLATE AS 4809979 - Caterpillar

The previous two illustrations show heavy pitting. This part should not be used again even though the pitting is not extended all the way across the groove.
Illustration 9 g02001280
Illustration 10 g02001281
Enlarged view of illustration 9
Although the pitting is shallow, the pitting is found in both grooves for the O-ring
DO NOT USE AGAIN
Illustration 11 g02001278
Illustration 12 g03351800
Enlarged view of illustration 11
USE AGAIN
The previous two illustrations show pitting that is not heavy, the pitting does not extend across the groove, and the pitting is only in one of the grooves. This part can be used again.
Illustration 13 g02001286
Illustration 14 g02001287
Enlarged view of illustration 13
USE AGAIN
The previous two illustrations show pitting that is not heavy and the pitting is not all the way across the groove. This pitting is mainly in one groove only.
Illustration 15 g02001289
Illustration 16 g02002055
Enlarged view of illustration 15
USE AGAIN
The previous two illustrations show damage that is only cosmetic. Both grooves for the O-ring seals are acceptable.
Illustration 17 g02002056
Severe corrosion and several fins are broken out
DO NOT USE AGAIN
Illustration 18 g02002057
No fins are broken out and the mild corrosion was caused by a coolant leak
USE AGAIN
The fins of the aftercooler should be straightened out carefully after the coolant leak has been repaired.
Illustration 19 g02002058
Weld all cracks and breaks before reusing
USE AGAIN
Salvage Procedures
Grooves for O-ring Seals
When servicing aftercoolers, an emery cloth may be used. Silicone sealers are not recommended in the grooves for the O-rings.Fins
A small flat head screwdriver can be used to straighten bent fins.Flange
Depending on the severity of cracks or breaks and accessibility to welding equipment, it may be easier and faster to replace the flange. A cracked or broken flange must be fixed before reinstalling the aftercooler.All welding and brazing on an aftercooler should be checked for cracks and leaks. Any cracks or leaks should be repaired before the aftercooler is used again.Handling and Testing
Whenever you are servicing, transporting, or storing an aftercooler, make sure that all connectors are capped or plugged to prevent dirt and other contaminants from entering the system.Also, copper fins are soft. Be sure to protect the fins during service, transport, and storage to prevent damage.Testing Procedures
Plug one coolant inlet/outlet port with an expandable plug or blocking cover with O-rings. Seal the drain port with a suitable plug. Cap the other coolant port with an expandable plug or blocking cover equipped with an air pressure tap. Apply 413 kPa (60 psi) air pressure to the air pressure tap and immerse the core in room temperature water. If no air bubbles are seen, the core does not leak and the core can be put back into service.