CONT GP 4416548 - Caterpillar

Inspect the Zinc Rods
The zinc rods are red for easy identification. Table 1 shows the locations of the zinc rods and the quantities of the zinc rod:
Table 1
Locations of the Zinc Rods
Location Quantity
Heat Exchanger 1
Transmission Oil Cooler(1) 2
Located in front of the aftercooler 1
(1) Zinc rods will only be located in marine transmission oil coolers that are cooled with sea water.
Remove the zinc rod.
Inspect the zinc rod. Ensure that the zinc rod will remain effective until the next scheduled inspection.
If the zinc rod has deteriorated excessively, install a new zinc rod.
Illustration 1 g00481100
Tap the zinc rod lightly with a hammer. If the zinc rod flakes, install a new zinc rod.
If the zinc rod will be reused, scrape the layer of oxidation from the zinc rod before installation. The layer of oxidation reduces the effectiveness of the zinc rod. Replace the Zinc Rods
Unscrew the old zinc rod from the plug. If not enough material remains or the zinc rod has broken off, drill the old zinc rod from the plug.
Clean the plug.
Illustration 2 g00480345
(1) Shoulder of the zinc rod
(2) Threads of the zinc rod
(3) External threads of the plug Note: DO NOT apply adhesive or sealant to threads (2) of the zinc rod.
Apply 9S-3263 Thread Lock Compound to shoulder (1) of a new zinc rod. Apply the compound ONLY to the shoulder of the zinc rod. Install the zinc rod onto the plug.
Coat external threads (3) of the plug with 5P-3413 Pipe Sealant. Install the zinc rod.