1889568C3 (LP)
Turbolader · Navistar
Turbochargers for diesel commercial vehicle engines: how boost pressure is generated, wastegate and VTG control, failures and replacement checks
A turbocharger uses energy from the exhaust stream to drive a turbine and, on the same shaft, a compressor that pressurises the intake air; higher boost pressure increases cylinder filling and allows more fuel to be burned for the same swept volume. Many diesel engines in commercial vehicles and nonroad machines use a wastegate or variable turbine geometry (VTG) to control boost pressure across the speed range.
Turbochargers are matched to the engine family, emission stage and power variant: compressor wheel trim, turbine housing A/R ratio and bearing type differ between engines that otherwise look alike. A VTG turbocharger is additionally linked through an electronic or pneumatic actuator to the engine control unit. The assignment list on this page comes from official EPA certification documentation.
Worn shaft bearings show up as whistling noise, power loss and bluish exhaust smoke as oil passes through the seals into the intake or exhaust tract; a failed wastegate or a seized VTG actuator produces boost pressure faults and limp-home mode; blade damage results from foreign objects in the intake or exhaust flow.
Replacement is matched by part number rather than housing size, since different trim levels look identical; check oil supply and return lines and the charge air ducting for contamination, since old oil or debris will immediately damage a new turbocharger; VTG units require the actuator to be relearned by the control unit after replacement. Price and availability are not covered on this page.
Fits these engines (3)
| Navistar A240 | Heavy-Duty-Straßenmotoren |
| Navistar A260 | Heavy-Duty-Straßenmotoren |
| Navistar A300 | Heavy-Duty-Straßenmotoren |
Excludes price and availability — those come from the supplier.