Cummins/Onan — Oil Cooler Element and Gasket - Replacement
Repair & overhaul · Lubrication 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
- Be sure to remove the shipping plugs from the new cooler element.
Procedure
- Drain the coolant.
- Remove the oil filter.
- Clean all debris from around the cooler.
- Disconnect the turbocharger oil supply line from the oil filter head.
- Remove the oil cooler cover, element and gaskets.
- Clean the sealing surfaces.
- Pressurize the element to 690 kPa [100 psi] to check it for leaks.
- Assemble the oil cooler gasket, element, cooler cover gasket and cooler cover to the cylinder block; torque 24 N.m [18 ft-lb].
- Connect the turbocharger oil supply line; torque 15 N.m [11 ft-lb].
- Install a new oil filter following the manufacturer's instructions.
- Fill the coolant system and operate the engine to check for leaks.
- Stop the engine and check the coolant and oil level.
Specs & values
- Cooler element/cover torque 24 N.m [18 ft-lb]
- Turbocharger oil supply line torque 15 N.m [11 ft-lb]
- Pressurize element to 690 kPa [100 psi]
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.