154154-1200 ZEXEL 9 421 610 010 BOSCH COILED SPRING 9421610010 1541541200 5157230820

Fig. 4-Axial Bearing Movement CheckFasten dial indicator to turbine housing so that the indicator tip rests on the end of the shaft (Fig. 4).Move the shaft back and forth axially by hand. The total axial movement of the shaft should be 0.001 to 0.004 in. (0.03 to 0.10 mm). If not repair or replace unit.Repair
As each part is removed, place it in a clean protective container.Refer to Fig. 6 for part identification and relationship.
Fig. 5-Turbine Housing RemovalScribe a line on the mating surfaces of the turbine housing (1, Fig. 5) and center housing (2) to aid in alignment during reassembly.Remove the turbine housing-to-center housing cap screws (5, Fig. 5), lock plates (3), and clamps (4). Carefully remove turbine housing.
Fig. 6-Turbocharger Exploded View
Fig. 7-Removing Compressor (Impeller)Mount a suitable holding fixture (1, Fig. 7) (see Group 0499 Special Tools - Turbocharger) in a vise.Insert the turbine wheel into the fixture.Use a double universal socket to remove the compressor wheel retaining nut to avoid possible bending of the shaft.Remove the impeller (2, Fig. 7) from the shaft.
Fig. 8-Shaft and Wheel AssemblyRemove the turbine wheel and shaft assembly (3, Fig. 8) from the center housing keeping it centered until it is clear of the housing. Fig. 8 shows the turbine wheel assembly (1). The piston ring (2) can now be removed.Remove the back plate to center housing cap screw (16, Fig. 6) and lock plates (15).Carefully remove back plate by tapping with a soft mallet.
Fig. 9-Back Plate Assembly IMPORTANT: Back plate (2, Fig. 9) and the spring (1) are sold only as an assembly. The installed depth of the spring is a controlled dimension. Therefore, do not remove or replace the spring by itself. Cleaning can be done without removing the spring from the back plate.
Fig. 10-Removing Thrust Collar and Thrust WasherRemove the thrust collar (2, Fig. 10) and thrust washer (3) as shown in Fig. 10. Remove the O-ring (1) from housing and piston ring (4) from thrust collar.
Fig. 11-Retaining Ring and Bearing RemovalRemove retaining rings (2, Fig. 11) with a No. 501 Waldes Truarc Snap Ring Pliers, if snap rings are used, and bearings (1) from both sides of the center housing.Cleaning
Before cleaning, inspect parts for signs of burning, rubbing, or other damage which might not be evident after cleaning.Soak all parts in clean carbon solvent for approximately 25 minutes. After soaking use a stiff bristle brush to remove all dirt particles. Dry parts thoroughly. Normally, a light accumulation of carbon deposits will not affect turbine wheel operation.Inspection
Replace the following parts: O-ring (13, Fig. 6), lock plates (6, 15, and 21) piston rings (8 and 18), retaining rings (11), and all damaged nuts and bolts. If bearings and thrust washers show signs of nicks, scores, shellac deposits, or foreign material embedment, replace them.After cleaning, if any of the parts in the assembly show signs of rubbing, scoring, scratches, or seizure, replace them.Assembly
Be sure each part is clean before assembling. As parts are assembled, cover openings to prevent entry of dirt