18 ASPIRATION SYSTEM
To clean the impeller and the compressor
casing18A-02
Generally, it is not necessary to remove the
turbocharger to remove the compressor casing,
except on some engines where the compressor
casing is held by a circlip and access to the circlip
is not always possible. This type of turbocharger is
usually fitted to engines used in vehicle
applications.
1 Release the clip and remove the hose from the
compressor inlet. Release the clips and push the
hose on the compressor outlet up the elbow of the
induction manifold.
2 Make a reference mark on the compressor
casing (A1) and on the bearing housing to ensure
correct assembly later.
3 Release the setscrews and remove the lock
plates. If the compressor casing is retained by a
circlip, remove the circlip. It may be necessary to
remove the turbocharger if access to the circlip is
not possible. If the turbocharger has a waste-gate
unit, remove the actuator and bracket assembly,
see operation 18A-03.
Caution: Be careful not to damage the impeller
blades. If the impeller is damaged, the turbocharger
must be renewed.
4 Remove carefully the compressor casing from
the turbocharger (A). If the casing is tight, lightly hit
it with a soft faced hammer.
5 Put the compressor casing in a suitable container
that contains a non-caustic solution. Allow the dirt
to become soft and then clean the casing with a
hard brush and/or a soft scraper. Dry the casing
with clean, compressed air at low pressure.
6 Clean the impeller with a soft brush.
7 Push carefully the compressor impeller towards
the bearing housing and turn the impeller by hand.
Check that there is no restriction of movement and
that there is no noise which can indicate a fault. If
there is a fault, remove the turbocharger for
inspection by a specialist.
8 Fit the casing to the turbocharger and align the
mark on the casing with the mark on the bearing
housing. Fit the lock plates and the setscrews and
tighten the setscrews.If the compressor casing of
the turbocharger is retained by a circlip, fit the
circlip loosely to the bearing housing. Ensure that
the flat face of the circlip is toward the compressor
casing. Fit the casing to the turbocharger and align
the marks on the casing and on the bearing
housing. Fit the circlip in its groove. If the
turbocharger has a waste-gate unit, fit the actuator
and bracket assembly, see operation 18A-03.
9 Fit the hoses to the compressor inlet and outlet
and tighten the clips.
1
PA183
10 If necessary, fit the turbocharger to the engine,
operation 18A-01.
18A.06 Perkins Phaser/1000 Series, April 1995
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