Yanmar 3TNV Series Service Manual page 54

( 3) Turbocharger blower cleaning*
When engine speed seems sluggish or the exhaust color looks poor, the blades of the
turbocharger-blower may be dirty.
Wash the turbine blower in such a case.
(a) General items
1) As for washing, use washing liquid and clear water.
2) Washing time is the time when about 10% of the boost pressure decreases more than that of
usual operation state as a standard.
3) Disassemble and clean a turbocharger periodically because the whole of the turbocharger can't be
cleaned in this method.
(b) Washing point
1) A specified quantity of washing liquid/water is poured with a filler (ex. Oil sprayer) from the air inlet
of the blower gradually (about then seconds) at the normal load (3/4-4/4) of an engine.
And, perform this work at no-load after load running of the engine, if it is difficult to pour the liquid
into the blower at load running.
Specified quantity of washing liquid/water
Turbocharger model
Injection amount, one time
It causes an accident when large quantity of washing liquid is poured rapidly into a turbocharger.
2) Pour the same amount of clear water as washing liquid/water into the blower about 3-5 minutes
later after the washing liquid/water injection and wash it.
It causes an accident when large quantity of water is poured rapidly into a turbocharger.
3) Repeat the washing after then minutes when there is no change with the boost pressure or the
exhaust gas temperature after washing.
When there is no change at all even if it repeats 3-4 times, disassemble and maintain the
turbocharger because of the cruel dirt of the blower or other causes.
4) Operate the engine at load for at least 15 minutes after washing, and dry.
RHB31, RHB51
20 cc
39
2. Inspection and Adjustment