PIN 9R0097 - Caterpillar

Corrosion in sea water circuits can result in premature deterioration of system components, leaks, and possible cooling system contamination.Zinc rods are inserted in the sea water cooling system of the engine in order to help prevent the corrosive action of salt water. The reaction of the zinc to the sea water causes the zinc rods to deteriorate. The zinc rods deteriorate instead of engine parts for the cooling system that are more critical. Rapid deterioration of zinc rods may indicate the presence of uncontrolled electrical currents from improperly installed electrical attachments or improperly grounded electrical attachments.The zinc rods must be inspected at the proper intervals. The zinc rods must be replaced when deterioration occurs.Inspect the zinc rods within 24 hours of initially filling the plumbing with sea water. If no significant corrosion is noted, inspect the zinc rods weekly or inspect the zinc rods after each 50 hours of engine operation.Locations of the Zinc Rods
Auxiliary Water Pump
Illustration 1 g03218057
Partial view of the front of the engine.
One zinc rod is located on the front of the engine next to the auxiliary water pump.Heat Exchanger
Illustration 2 g03218060
Partial view of the heat exchanger.
One zinc rod is located on the water line above the frame to which the heat exchanger is attached. One zinc rod is located on the water line on the right side of the frame.Auxiliary Water Lines
Illustration 3 g03218059
Partial view of the top of the engine.
One zinc rod is located on each auxiliary water line on top of the engine.Aftercooler
Illustration 4 g03382521
View of the left side of the aftercooler (parts removed for better visibility)
One zinc rod is located on each side of the front of the aftercooler. One zinc rod is located on each side of the rear of the aftercooler.Auxiliary Water Line on Left Side of Engine
Illustration 5 g03382522
Partial view of the left side of the engine towards the front (parts removed for better visibility)
One zinc rod is located on the auxiliary water line on the left side of the engine.Inspect the Zinc Rods
Remove the zinc rod.
Illustration 6 g00104048
Tap the zinc rod lightly with a hammer. If the zinc rod has deteriorated, or if the zinc rod flakes, install a new zinc rod. Replace the Zinc Rods
Illustration 7 g00104049
Unscrew the old zinc rod or drill the old zinc rod from the plug. Clean the plug.
Apply one of the following thread-locking compound to the shoulder of a new zinc rod with pipe threads. Do not apply the compound to any other type of zinc rod. Apply the compound only to the shoulder of the zinc rod.
Loctite 242
Loctite 5926 (Africa, European Union, Middle East)
Install the zinc rod into the plug.
Coat the external threads of the plug with one of the following thread adhesives.
Loctite 536
Loctite 567 (Turkey)
Install the zinc rod. Refer to the Specifications Manual for more information on torque specifications