An exhaust gas turbocharger is standard equipment on all MBE 900 engines. To determine if the turbocharger needs to be replaced, do a visual inspection and then inspect the control unit.
Inspect as follows:
Inspect the air induction system for loose connections. Check the ducts and lines for cracks, punctures, or corrosion.
Disconnect the exhaust ducting from the turbo compressor outlet and check the turbocharger wheel for damage.
A light may be useful for examining the turbocharger wheel blade tips inside the turbocharger housing. The surfaces requiring inspection can be viewed from the outlet of the turbocharger housing.
If the turbocharger wheel rubs against the housing, or if the blades are damaged, replace the turbocharger (refer to section
Disconnect the air duct from the compressor air inlet and check the compressor wheel for damage. If the wheel is damaged, or if the wheel rubs against the housing, replace the turbocharger (refer to section
Inspect the entire turbocharger system for excessive oil.
A light film of oil is normal in the air inlet compressor area and exhaust ducting.
Check the oil supply and return lines for leaks. Tighten all connections to the proper torque value.
Install the air inlet and exhaust ducts, then tighten all connections.
Check the outside of the control unit for abnormal conditions. If the unit is damaged, replace the turbocharger. Refer to section
Inspect the air cleaner pipe, turbo compressor outlet pipe, exhaust manifold, and the oil supply and return lines for restrictions or foreign objects.
Install the turbocharger on the exhaust manifold. Use new nuts to install the turbocharger. Tighten the nuts. Use the torque values listed in Table
Turbocharger to Exhaust Manifold Nuts
30 Nm (22 lbft)
50 Nm (37 lbft)
Exhaust Brake Valve
30 Nm (22 lbft)
50 Nm (37 lbft)
Turbocharger Oil Supply Line Bolts
10 Nm (7 lbft)
40 Nm (30 lbft)
Using new nuts, install the exhaust brake valve housing on the turbocharger. Tighten the nuts.
Attach the heat shield to the turbocharger and the exhaust brake valve housing.
Using a new gasket, attach the oil return line to the turbocharger.
Fill the bearing housing with clean engine oil through the oil inlet port. Turn the turbocharger wheel several times to coat the bearings with oil.
If the turbocharger wheel cannot be spun freely by hand or if there is any indication of rubbing or scraping, determine if the contact is due to wheel rubbing resulting from a misaligned turbocharger housing or foreign object in the wheel area.
Refill the oil inlet port and connect the oil supply line. Use the torque values listed in Table
Connect the pipe between the exhaust brake valve housing and the exhaust pipe.
Connect the exhaust brake air line.
Attach the turbo compressor outlet pipe to the turbocharger. Tighten the clamp firmly.
Attach the air cleaner pipe to the turbocharger.
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.
Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other reproductive harm.
Always start and operate an engine in a well ventilated area.
If operating an engine in an enclosed area, vent the exhaust to the outside.
Do not modify or tamper with the exhaust system or emission control system.
Start the engine and allow it to run at idle speed for three to four minutes before accelerating.