Measures In Case Of Turbo Failure On Tad- Engines; Turbocharger, Replacing/Refitting On Engine - Volvo Penta TAD1630G Workshop Manual

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Measures in case of turbo
failure on TAD- engines
In case of turbo failure on TAD-engines, it is essential to
check the charge air cooler. Should a large leakage of oil be
suspected, or foreign objects, such as bits from the broken
compressor wheel, have been forced into the charge air
cooler, the following measures must be taken:
1
Check the charge air hoses to the charge air cooler. If there
is any trace of oil on the charge air cooler, the hoses must
be removed and cleaned internally in a suitable solvent
(white spirit or equivalent). The charge air cooler must also
be cleaned. If the black charge air cooler hose is contaminat-
ed with oil, it must be replaced since oil has a detrimental ef-
fect on the rubber.
2
If failure of the turbo resulted in a fracture on the compressor
wheel, the charge air cooler must be pressure tested to
check whether or not it has been damaged by bits from the
compressor wheel.
Replacing/reinstalling
turbocharger on engine
Note: When replacing a turbocharger always determine the
cause of failure. Repair any damage before the new turbo
unit is fitted.
When replacing/reinstalling a turbocharger, it is very impor-
tant that the instructions provided with the compressor are
carefully studied.
1
For a turbo unit to operate satisfactorily, one condition is that
the engine oil system and intake system are kept in good
working order, i.e. that the oil is replaced at the recommend-
ed times, that the correct type of oil is used and that the oil
cleaner and air cleaner are also changed as directed.
The initial measure is therefore to check the engine oil and
the oil cleaner and, if so required, to replace the cleaner be-
fore the new turbo unit is fitted. Preferably, the engine should
be run a few minutes before the new turbo unit is fitted.
Service procedures - intake and exhaust systems
Note: As an extra precaution to prevent contaminated oil
from reaching the turbocharger, a strainer can be mounted
temporarily in the compressor inlet connection. The engine
must then be run for at least half an hour. Note that the
strainer must then be removed since otherwise, should the
lubricating system not be properly serviced, there is a risk
that oil will not reach the turbocharger due to the blockage of
the strainer.
2
Before starting the new turbo, use an oil can to spray oil into
the turbo bearing system to provide correct lubrication from
the start.
3
When replacing a turbo, care must be taken so that flakes of
rust or deposits do not drop into the exhaust manifold. These
flakes could damage the turbine of the new unit.
It is also import to clean the intake line from the air cleaner
since any bits lying there from, for example, a fractured com-
pressor wheel, would cause an immediate breakdown of the
new turbo.
Note: the rubber hose (return line) from the turbo to the en-
gine must be oil-resistant.
4
Always check that the injection equipment is in good condi-
tion and that all of the seated components are fitted with au-
thorized, unbroken seals.
5
Check that the oil is circulating properly after starting the en-
gine by loosening the return pipe union on the block.
To avoid damage to the turbocharger, the engine can be
cranked round with the starter motor, and the stop control
pulled out, until oil pressure is built up.
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