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Home›Repair guides›Cummins/Onan›Coolant Filter Replacement

Cummins/Onan — Coolant Filter Replacement

Maintenance · Cooling system

From a Cummins/Onan owner's manual covering: GTA8.3, GTA8.3 CD1, GTAR 3. Check it applies to your exact model before use.

Applies to: Cummins/Onan GTA8.3 engine

Before you start

  • Do not remove the radiator cap from a hot engine.
  • Severe engine damage will result if the valve is left in the closed position.

Procedure

  1. Turn the coolant shutoff valve to the OFF position.
  2. Remove and discard the coolant filter; clean the gasket surface on the filter head.
  3. Apply a light film of Lubriplate 105 or equivalent to the coolant filter gasket sealing surface before installing the coolant filter.
  4. Install the filter as specified by the manufacturer.
  5. Open the shutoff valve and install the coolant system pressure cap.
  6. Operate the engine until the coolant temperature is above 82 C [180 F], and check for leaks.
  7. After the air has been purged from the system, check the coolant level.

Source: Cummins/Onan 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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