Hino Motors J08E-VC Workshop Manual page 256

EN08–20
Blower
Move it in the radial
impeller
direction
TURBOCHARGER (J08E)
(3)
4.
(1)
(2)
SHTS011060800011
(3)
5.
Turn the tip of the
(1)
blower impeller
(2)
SHTS011060800012
6.
(1)
(2)
! CAUTION
Turbocharger is replaced as assembly. Do not overhaul.
SHTS011060800013
Foreign object damage
a. If foreign object damage to the turbine is visible, the turbocharger
must be overhauled. Such damage destroys the wheel's balance
and causes internal damage to the seal bores and journal bear-
ings. Be sure to find the source of the foreign object. In many
cases, the object has come out of the engine, and there may be
engine damage as well.
EXAMINE COMPRESSOR WHEEL AND HOUSING.
Remove the duct from the compressor inlet. Using a flashlight, check
the compressor for wheel to housing rub, evidence of oil leakage, or
foreign object damage.
Wheel to housing rub
If wheel rub is found, and the housing attaching hardware is secure,
then the turbocharger is probably damaged internally and must be
overhauled.
Oil leakage
Oil leakage into the compressor can be caused by:
a. Long periods of idling on a restricted oil drain line.
b. Oil leakage into the compressor can also be caused by a
restricted air intake system.
c. Oil leakage into the compressor can be caused by frequent use of
the engine as a brake. In this case, nothing is wrong with either
the engine or the turbocharger, but frequent compressor wheel
and housing clean-up is recommended.
Foreign object damage
If the compressor wheel has been damaged by a foreign object, the
turbocharger must be overhauled.
SIMPLE INSPECTION OF THE TURBINE SHAFT
Holding the blower impeller tip, inspect for rotating condition by lightly
rotating the turbine shaft by hand.
If the turbine shaft does not rotate or does not rotate smoothly, or the
blower impeller contacts with the blower case, replace the turbo-
charger assembly.
INSPECTING THE TURBINE SHAFT PLAY IN THE AXLE
(THRUST) DIRECTION
Inspect the turbine shaft play on the exhaust side.
If a measurement reading exceeds the standard value, replace the
turbocharger assembly.
Standard value: 0.165 mm {0.0036 in.} or less
f