Vectra Fitness 175, Техническое руководство по двигателю, Страница: 62 / 96

Page No. : 61
ASPIRATION SYSTEM
To Clean the Impeller and the Compressor Casing
Generally, it is not necessary to remove the turbo
charger to remove the compressor casing, except
on some engines where the compressor casing is
held by a circlip and access to the clip is not always
possible.
1. Release the clip and remove the hose from the
compressor inlet. Release the clips and remove
the hose on the compressor outlet connecting
the induction manifold.
2. Make a reference mark on the compressor
casing 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.
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. 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
towards 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.
9. Fit the hoses to the compressor inlet and outlet
and tighten the clips.
10. If necessary, fit the turbocharger to the engine.
NOTE: Refer Turbocharger faults to Section R
(Trouble Shooting Page No. 92).