PIN 9R8202 - Caterpillar

Galvanic corrosion may harm components that cool the engine. Corrosion is caused when dissimilar metals are in contact and the dissimilar metals are immersed in salt water. The voltage potential from salt water to the engine must be tested on a regular basis to protect the cooling components.Location of the Corrosion Protection Post
C18 SCAC Marine Engine
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(1) Bonding connector
(2) Bonding stud
(3) Vessel zinc C32 SCAC Marine Engine
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(4) Bonding connector
(5) Vessel zinc
(6) Bonding stud Testing the Voltage Potential
Operate the engine for at least 30 minutes, then stop the engine. Disconnect the engine from the shore power connection. Use a 257-9140 Multimeter and a 244-1536 Cable Group to test the voltage potential from the salt water to the engine. A silver-silver chloride half cell probe is widely available if the Cat tools are not available.
Connect a #8 American Wire Gauge (AWG) cable from the sacrificial anode to the bonding system of the vessel.
Test the voltage at the bonding stud.
Test the voltage at the bonding connector. Results of the Test
The voltage potential must be between -0.500 mV and -0.800 mV.Note: A value near or greater than 0.0 mV is extremely corrosive.Measure the galvanic potential of the system and apply zinc or other less noble metal to divert corrosion. Contact your Cat dealer for more information.