Checking pressure in the duct at turbocharger exit
(Fig. 3)
Remove the intake pipe plug and fit no. 5.9030.515.0 pressure
gauge.
Start the engine and ensure that both peak horsepower speed and
maximum torque speed pressures correspond to the specifica-
tions indicated in related table.
Out of specifications readings may be due to poor air filter efficien-
cy which should therefore be checked.
Also check couplings for distorsion or tearing; replace as neces-
sary.
If trouble persists, remove turbocharger side covers and check
impeller blades for dirt build-up.
All carbon deposits should be removed using a plastic brush.
Checking exhaust pipes
Be sure the exhaust pipes enable the exhaust gases to be properly
expelled; otherwise remove any carbon deposits.
If after performing the above checks the turbocharger is not
operating smoothly a thorough overhaul shall be carried out.
Removal (Fig. 4 and Fig. 5)
Disconnect the lubricating pipes from cylinder block.
Loosen the pipe-to-turbocharger securing screws and remove
together with gaskets.
Ease-off clamps A and remove coupling B connecting turbochar-
ger to intake manifold, (Fig, 4)
Loosen the two coupling fixing clamps placed between air filter
and turbocharger and remove coupling.
Warning: conveniently plug the turbocharger ducts to prevent any
foreign matters from entering.
Unloose the 4 screws securing the turbocharger A manifolds to
exhaust manifold B as well as the nuts fastening the muffler
support C both to turbocharger and exhaust pipe, then remove the
turbocharger, (Fig, 5).
Fig. 3 - Checking pressure inside the intake pipe.
Fig. 4 - Manifolds-to-turbocharger connecting
couplings.
Fig. 5 - Turbocharger separation.
engine
intake and exhaust system
18
1
87
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