Cummins/Onan QSX15 / QSx15 — Turbocharger - Install
Repair & overhaul
For the Cummins/Onan QSX15 / QSx15, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan QSx15, Cummins/Onan QSX15 engine
Before you start
- Proper routing of turbocharger oil supply tube is critical to prevent failure. Avoid any tube-to-metal contact.
- This component weighs 23 kg [50 lb] or more. Use a hoist or get assistance to lift this component.
Procedure
- Apply film of high-temperature anti-seize compound Part No. 3823097 to turbocharger mounting studs.
- Install new mounting gasket, turbocharger, and four mounting nuts. Tighten mounting nuts to 60 Nm [45 ft-lb].
- Install discharge elbow and clamp onto CAC pipe connection.
- Install new o-ring seal, clamp, and discharge elbow to turbocharger. Tighten clamps to 9 Nm [75 in-lb].
- Install new gasket, oil drain tube, and capscrews. Tighten capscrews to 25 Nm [18 ft-lb].
- Install wastegate actuator hose, if equipped.
- Pour 50 to 60 cc [2 to 3 oz] of clean engine oil into turbocharger oil supply opening.
- If installing new turbocharger, align and tighten v-bands. Install male union elbow to 30 Nm [22 ft-lb].
- Install turbocharger oil supply tube on elbow to 30 Nm [22 ft-lb].
- Install intake and exhaust pipes to turbocharger and tighten clamps to 9 Nm [75 in-lb].
- Operate engine and check for air and oil leaks.
Tools required
- 3823097 High-temperature anti-seize compound Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Turbocharger mounting nuts: 60 Nm [45 ft-lb]
- Turbocharger discharge elbow clamps: 9 Nm [75 in-lb]
- Turbocharger oil drain tube capscrews: 25 Nm [18 ft-lb]
- Turbocharger male union elbow: 30 Nm [22 ft-lb]
- Turbocharger oil supply tube: 30 Nm [22 ft-lb]
- Turbocharger intake/exhaust pipe clamps: 9 Nm [75 in-lb]
Full service-parts list: Cummins/Onan QSx15 →
Source: Cummins/Onan operator'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.