Cummins/Onan GTA38 / GTA50 — Turbocharger - Remove and Install
Repair & overhaul · Air/exhaust system
For the Cummins/Onan GTA38 / GTA50, from the Cummins/Onan owner's manual.
Applies to: Cummins/Onan GTA38 engine, Cummins/Onan GTA50 engine
Before you start
- Component weighs 23 kg [50 lb] or more; use a hoist.
- Confirm correct turbocharger assembly number on the data tag.
Procedure
- Disconnect oil drain hose from cylinder block; discard o-ring/gasket.
- Disconnect oil drain hose from turbocharger; discard gasket.
- Disconnect oil inlet hose and remove support clamps.
- Loosen clamps; remove the four cap-screws and nuts.
- Remove turbocharger and gasket (component weighs 23 kg+; use hoist).
- Install hose and clamps on aftercooler connection; do not tighten.
- Install gasket on exhaust manifold with raised bead toward turbocharger.
- Install turbocharger; push compressor housing into hose.
- Coat cap-screw threads with anti-seize; install and torque 40 Nm [30 ft-lb].
- Tighten clamps to 9 Nm [80 in-lb].
- Install o-ring on oil inlet fitting; torque 35 Nm [25 ft-lb].
- Connect oil inlet hose and install clamps.
- Install oil drain gasket, hoses and cap-screws; torque 40 Nm [30 ft-lb].
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Cap-screws 40 Nm [30 ft-lb]
- Clamps 9 Nm [80 in-lb]
- Oil inlet fitting 35 Nm [25 ft-lb]
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.