Caterpillar 3126B / 3126B Industrial Engine — Cooling System Coolant (DEAC) - Change

Maintenance

For the Caterpillar 3126B / 3126B Industrial Engine, from the Caterpillar owner's manual.

Applies to: Caterpillar 3126B, Caterpillar 3126B Industrial Engine engine

Procedure

1. Stop the engine and allow the engine to cool. Loosen the filler cap slowly to relieve pressure. Remove the filler cap.
2. Open the cooling system drain valve (or remove a drain plug). Allow the coolant to drain.
3. Flush the cooling system with clean water to remove debris.
4. Close the drain valve; clean and install the drain plugs.
5. Fill with clean water and Caterpillar Fast Acting Cooling System Cleaner (0.5 L per 15 L capacity). Install filler cap.
6. Start and run the engine at low idle for a minimum of 30 minutes; coolant temperature at least 82 °C (180 °F).
7. Stop engine, cool, drain and flush with clean water. Close drain and install drain plugs.
8. Fill the cooling system with coolant/antifreeze. Do not install the filler cap.
9. Start and run engine at low idle; increase to 1500 rpm; run at high idle one minute to purge air. Stop engine.
10. Check coolant level to within 13 mm (0.5 inch) below the bottom of the filler pipe.
11. Clean and inspect the filler cap gasket. Pressure test the cap with a 9S-8140 Pressurizing Pump.
12. Start the engine. Inspect the cooling system for leaks and proper operating temperature.

Full service-parts list: Caterpillar 3126B →, Caterpillar 3126B Industrial Engine 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.

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