Turbocharger

Disassembly

1. Remove four 12-point head screws from bottom of turbocharger pedestal assembly.

   

2. Remove and discard O-rings which seal oil passages to the turbocharger.

   

3. Mark turbine housing, center housing and compressor housing to facilitate reassembly.

   
   
   
   

   Item	Part Number	Description
   1	—	Turbine Housing (Part of 6K682)
   2	—	Center Housing (Part of 6K682)
   3	—	Compressor Housing (Part of 6K682)
   4	—	Alignment Marks

4. Remove four bolts securing turbine housing to center housing. Carefully lift turbine housing from center housing.

   

5. Remove four bolts securing compressor housing to center housing.

   

6.  CAUTION: Care must be taken during the handling of the impeller and turbine wheel. Be very careful and avoid bending any blades. Wheels with bent blades must never be used. Do not attempt to straighten bent wheel blades.

   NOTE: Turbine wheel deposits can be caused by excessive oil consumption resulting in turbine wheel carbon deposits or engine overfueling. These will cause excessive operating temperatures that can cause aluminum components to melt. Such deposits may be found on the turbine wheel if such a failure occurs.

   Visually inspect compressor impeller and turbine wheel for blade erosion, bending, breakage or deposits.

7. If one or more inspections are out of specification or visually unacceptable, repair or replace parts. Then reassemble turbocharger and attach to turbocharger pedestal assembly. If turbocharger passes all disassembly inspections, reassemble turbocharger and attach to turbocharger pedestal assembly. Reinstall on engine.

Assembly

1. Slide turbine housing over impeller and align marks on both center and turbine housing sections. Secure turbine housing to center housing with four bolts. Tighten to 20-24 Nm (15-18 lb-ft).

2. Apply High Temperature RTV sealant to compressor side of center housing.

   

3. Carefully slide compressor housing over compressor wheel and align marks on both housings. Secure housing halves together with four mounting bolts. Tighten to 15-17 Nm (11-13 lb-ft).

   

   Item	Part Number	Description
   1	—	Compressor Housing (Part of 6K682)
   2	—	Compressor Housing Mounting Bolts (Part of 6K682)
   3	—	Alignment Marks
   4	—	Turbine Housing Mounting Bolts (Part of 6K682)
   5	—	Turbine Housing (Part of 6K682)
   6	—	Center Housing (Part of 6K682)

4. Align bolt holes on exhaust back pressure control valve and turbine housing. Apply anti-seize compound to the mounting bolts. Tighten bolts to 7-9 Nm (62-80 lb-in).

   

5. Install two new O-rings to turbocharger pedestal assembly and lubricate O-rings with engine oil.

6. Apply anti-seize compound to four mounting bolts and tighten four 12-point head mounting bolts to 24 Nm (18 lb-ft).

   

7. Connect exhaust back pressure control actuator rod to the exhaust back pressure control valve.

8. Adjust actuator rod length to obtain 10 lbs. preload as measured using Spring Scale T74P-3504-Y.