Cummins/Onan GTA8.3 / GTAB.3 — Coolant Filter Replacement
Maintenance · Cooling system
For the Cummins/Onan GTA8.3 / GTAB.3, from the Cummins/Onan owner's manual.
Applies to: Cummins/Onan GTA8.3 engine
Before you start
- Severe engine damage will result if the valve is left in the closed position.
- Never over concentrate cooling system with DCA4.
Procedure
- Turn coolant shutoff valve to OFF position.
- Remove and discard coolant filter; clean gasket surface.
- Apply light film of Lubriplate 105 or equivalent to filter gasket.
- Install filter as specified by manufacturer.
- Open shutoff valve and install coolant system pressure cap.
- Operate engine until coolant temperature above 82 °C [180 °F] and check for leaks.
- After air purged, check coolant level.
Tools required
- filter wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.