Caterpillar 3512 — Zinc Rods - Inspect/Replace
Maintenance · Zinc rods (sea water cooling system)
For the Caterpillar 3512, from the Caterpillar owner's manual.
Applies to: Caterpillar 3512, Caterpillar 3512B engine
Before you start
- Do NOT apply adhesive or sealant to the threads of the zinc rod
Procedure
- Remove the zinc rod.
- Inspect the zinc rod to ensure it remains effective until the next inspection.
- If deteriorated excessively, install a new zinc rod.
- Tap the zinc rod lightly with a hammer; replace if it breaks.
- Scrape the oxidation layer from the zinc rod if reused.
- Use pliers to unscrew the old zinc rod from the plug.
- Clean the plug.
- Apply 9S-3263 Thread Lock Compound to the shoulder of a new zinc rod.
- Coat the external threads of the plug with 5P-3413 Pipe Sealant and install.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Refer to Specifications, SENR3130 for the plug torque
Full service-parts list: Caterpillar 3512 →, Caterpillar 3512B engine →
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.