Caterpillar — Zinc Rods - Inspect/Replace
Maintenance · Sea water cooling system
From a Caterpillar owner's manual covering: 3408C, 3412, 3412C. Check it applies to your exact model before use.
Applies to: Caterpillar 3408C, Caterpillar 3412, Caterpillar 3412C
Before you start
- Rapid deterioration of zinc rods may indicate uncontrolled electrical currents from improperly installed or grounded electrical attachments.
Procedure
- Remove the zinc rod.
- Tap the zinc rod lightly with a hammer.
- Install a new zinc rod if the rod has deteriorated or flakes.
- Unscrew or drill the old zinc rod from the plug; clean the plug.
- Apply 9S-3263 Compound only to the shoulder of the new zinc rod.
- Coat the external threads of the plug with 5P-3413 Pipe Sealant.
- Install the zinc rod; refer to the Operation and Maintenance Manual for torque specifications.
Specs & values
- Zinc rod locations: inlet adapter of heat exchanger (1), outlet elbow of heat exchanger (1), outlet elbow of auxiliary water pump (1)
Full service-parts list: Caterpillar 3408C →, Caterpillar 3412 →, Caterpillar 3412C →
Source: Caterpillar owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.