Install a new seal ring (14) over the thrust spacer (13) and install the thrust spacer over the shaft.
Align the match-marks on the impeller (9) and shaft, and install the impeller on the shaft using an arbor
press if necessary.
When removing or Installing the locknut (8), use a flexible socket to help avoid side-loading
the shaft. Side-loading could bend the shaft, resulting In excessive runout and vibration
problems In the assembled unit.
Install the locknut (8), and tighten in accordance with Figure 9-77.
Position the compressor housing (3) on the center housing (18), aligning the match-marks made during
disassembly. Install the V-band (2), and tighten the locknut (1) to 40 to 60 pound-inches (4.5 to 6.8
newton-meters). Using a soft hammer, seat the V-band by tapping around the outer diameter, and re-
torque the locknut.
Align the match-marks, and position the turbine housing (7) on the center housing (1 8).
Lubricate the bolts (4) with anti-seize compound, MIL-A-907, and install the damps (6), new lockplates (5),
and bolts (4). Cross-tighten the bolts in three steps to 100 to 110 pound-inches (11.3 to 12.4 newton-
Do not bend the tabs on the lockplates (5) at this time. The tabs will be bent after the final
positioning and installation on the engine.
Check for binding and scraping by pushing in on the impeller as far as possible and rotating it. Repeat this
check from the turbine end of the assembly. If binding or scraping is noted, disassemble the unit and
check for excessive runout. worn thrust members, or worn bearings.
Check bearing radial clearance:
Fabricate a dial indicator mounting plate (refer to Table 2-2)
Fasten a plunger-type dial indicator with 1 inch (25.4 mm) travel and a 2 inch (50.0 mm) extension rod
to the turbocharger oil drain mounting pad using the dial indicator mounting plate. Secure the
mounting plate and indicator using the bolts which were removed to gain access to the oil drain hole.
Move the rotating shaft up and down to check radial bearing clearance. Move the shaft in the same
direction as the dial indicator travels. Equal pressure should be applied to the shaft at both ends
simultaneously. The total dial indicator displacement should be within 0.003 to 0.007 inch (0.08 to 0.18
mm). If the measured movement is greater then 0.007 inch (0.18 mm), the rotating assembly must be
repaired or replaced.
Mount a dial indicator on the impeller or turbine housing, zero the indicator on the end of the shaft, and
check the total end clearance. The total end clearance shall not exceed 0.009 inch (0-23 mm) for a
repaired unit or 0.004 inch (0.10 mm) for an overhauled unit. If the clearance is excessive, disassemble
the unit and check the thrust members for wear.
If the turbocharger is to be stored, lubricate the internal parts with preservative oil, MIL-L-21260, and plug
Install the turbocharger in accordance with the Operator and Organizational Maintenance Manual.