TM 5-3805-281-24-2
Air Intake and Exhaust System
PERFORM RADIAL BEARING CLEARANCE
TEST
This test will give an indication of the condition of the
radial bearings within the center housing and rotating
assembly.
1. Fasten a magnetic base (plunger-type) dial indicator to
the turbocharger mounting base. Assemble an
extension adapter and indicator extension rod onto dial
indicator.
2. Position indicator tip (through center housing oil return)
on center of shaft. Preload indicator tip and zero dial
on indicator.
IMPORTANT: Use only moderate hand force (3-4
pounds) on each end of shaft when
checking clearance.
3. Grasp rotating shaft at both ends and move the shaft
Checking Radial Bearing Clearance
toward the indicator, then away from the indicator
(arrows). Use care to move the shaft in the same
direction as the dial indicator tip travels and apply
equal pressure at both ends of the shaft.
4. Observe and record total indicator movement.
Turbocharger Shaft Radial Bearing--Specification
Clearance ............................................ 0.13--0.18 mm (0.005--0.007 in.)
If total indicator reading is not within specification, install a
replacement turbocharger or replace center housing and
rotating assembly. (See REPLACE CENTER HOUSING
ASSEMBLY AND ASSEMBLE TURBOCHARGER, later in
this group.)
RG,RG34710,1260
1923OCT971/1