3208 Marine Engine Battery Electrolyte Level - Check Caterpillar


Battery Electrolyte Level - Check
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When the engine has not run for long or short periods of time, the batteries may not fully recharge. Ensure a full charge to help prevent the battery from freezing.

In warmer climates, check the electrolyte level more frequently.

Ensure that the electrolyte level is 13 mm (0.5 inch) above the top of the separators.

------ WARNING! ------

All lead-acid batteries contain sulfuric acid which can burn the skin and clothing. Always wear a face shield and protective clothing when working on or near batteries.


  1. Remove the filler caps. Maintain the electrolyte level to the "FULL" mark on the battery.

    If the addition of water is necessary, use distilled water. If distilled water is not available, use clean water that is low in minerals. Do not use artificially softened water.

  2. Check the condition of the electrolyte with the 245-5829 Coolant Battery Tester Refractometer.

  3. Keep the batteries clean.

    Clean the battery case with one of the following cleaning solutions:

    • A mixture of 0.1 kg (0.2 lb) of baking soda and 1 L (1 qt) of clean water

    • A mixture of 0.1 L (0.11 qt) of ammonia and 1 L (1 qt) of clean water

    Thoroughly rinse the battery case with clean water.

    Use the 1U-9921 Battery Service Tool to clean the battery terminals. Use a wire brush to clean the cable clamps. Clean the items until the surfaces are bright or shiny. DO NOT remove material excessively. Excessive removal of material can cause the clamps to fit improperly. Coat the clamps and the terminals with the Loctite® product listed below, petroleum jelly or MPGM.

    • For Americas North - Loctite LB8632

    • For Europe and Africa, Middle East, CIS (AMEC) - Loctite LB8104

    • For Asia Pacific - Loctite LB8801

    • For Americas South - Loctite LB Superlube

    For ordering the products listed above, go to the following address.

    http://www.loctite.com/en/meta/meta-nav/location-selector.html

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