Cummins/Onan — Aftercooler Pump - Replacement
Repair & overhaul · 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
- The system must be filled slowly to prevent air locks.
Procedure
- Drain the coolant.
- Remove the supply line connection.
- Remove the discharge line connection.
- Remove the aftercooler pump.
- Clean the sealing surfaces on the cylinder block.
- Install the aftercooler pump along with a new gasket; torque 77 N.m [57 ft-lb].
- Connect the supply and discharge lines.
- Fill the cooling system with a mixture of 50% water and 50% ethylene-glycol type antifreeze.
Specs & values
- Aftercooler pump torque 77 N.m [57 ft-lb]
- Coolant capacity (engine only) 10.9 liters [11.5 U.S. Qts.]
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.