Usage:
G3616 (4CG) ENGINES
Problem:
Two stage aftercooler core failures may result from improper venting of the coolant. The top rows of the tubes in the 130-8130 Aftercooler Core can trap air when the cooling system is filled with coolant. The trapped air increases the operating temperature of these tubes, and the tube walls may deteriorate due to oxidation. This could result in a coolant leak into the air manifold.
Solution:
A permanent solution is being worked on, and will be release when identified. In the interim, the addition of a vent tube is recommended to allow the trapped air to escape from the upper side of the aftercooler core. Drill and tap the end of aftercooler housing for 1/2 inch - 14 thread as shown in the illustration. Install the appropriate fittings to connect this location with a 9.50 mm (.375 in) diameter tube to the aftercooler/oil cooler vent line. This new vent tube must be on a constantly upward slope between the aftercooler core and the already installed vent tube.
Location and Dimensions for adding a vent hole to the aftercooler core.
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