Czyszczenie turbo VNT15.pdf
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Garrett VNT15 repair pictures
Recently I got the chance to obtain a Garrett VNT15 variable turbine geometry turbocharger
rather cheap. This turbo is mainly used in the new VW/Audi TDI engines up to 110bhp. I
intend to build an experimental gas turbine engine from this turbo, but I’ll carry out only
modifications on it that are reversible. This is because I can also use this turbo as a spare for
my car’s engine (Audi A3 TDI), and if I should ever be in the situation to need it, I’ll be happy
to have a spare handy, because the original replacement would be quite expensive.
At the time of purchase I didn’t know the reason of the turbo removement, but I blamed this to
a bad accident with damage to the engine beyond repair. I was told the turbo ran well at the
time of removal and the car was manufactured 1997 with now about 40.000km on it. And this
is what it looked like as I got it:
I was really astonished that it was
this clean on the outside and
revealed only minor corrosion.
The can on the left is the vacuum
actuator for the NGV controlling gear.
This turbo is a rather small unit,
weight just about 5kg. Look how
shiny the compressor housing still is.
I noticed, though, that the NGV
actuating mechanism was rather stiff,
if not to say stuck (at this time yet I
didn’t know why).
A view into the intake. This side is
also quite clean, the compressor
wheel except a very thin layer of dirt
in mint condition.
The exhaust section and the turbine
wheel are very sooty. I don’t know if
this can be considered as normal on
this type of engine because the car
exhausts almost no smoke at all,
even if driven hard.
Oops, I did it again!
(Though I definitely must say that I’m
no fan of Britney Spears’ music)
Well, I once promised myself I would never ever again take a turbocharger apart, since the
last time I did it I had to live with traces of black underneath my fingernails for about one week.
But this one looks so much cleaner, that I forgot about this promise.
The compressor came apart like this, almost no cleaning required!
Unfortunately I was glad about the
ceanliness of the turbo too soon - this
is a view of the turbine, a layer of
soot of approx. 1mm all over it.The
lever in the 3 o’clock position is part
of the NGV actuating system.
This is what the NGV actuating gear
looked like after disassembly. Did I
say something about “clean” before
??!! ;-)
And this is what it looks like some
really dirty hands later...
Each of the nine levers is welded to
the shaft of the corresponding nozzle
guide vane (NGV). The control ring is
moved by the main lever, located in
the turbo’s bearing housing,
projecting into the free notch in the
11 o’clock position.
And this is the other side of the NGV
system (removed from the turbine
housing and cleaned). Notice the
cute airfoil shape of the vanes. This
is the maximum exhaust flow -
minimum charge pressure - position.
The turbine wheel and bearing
housing cleaned (I don’t think I’ll get
this dirt off my hands ever again).
The NGV actuating main lever can
also be seen.
The turbo core. I didn’t take the rotor
apart because the bearings seem to
be in a pretty good condition and I
don’t want to tamper with the rotor
blancing (this one spins in excess of
200krpm). Just below the oil return
the outer NGV actuating lever is
visible.
Plik z chomika:
Oharra
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