How do you clean a turbocharger and keep it from
corrosion?
I have the
Yanmar Diesel 4JH4S-TFE in a 43 ft sailing
ketch.
After a year it was stuck in sud. Black smoke,
RPM max 1900, less
power.
reason: Exhaust too small. I had it increased to 3 " id, and the Turbocharger cleaned.
(Also the original exhaust
elbow was made of
aluminum and developed several cracks, I had a SS part made, so some water may have gone the wrong way in the exhaust elbow).
A year later it was totally corroded inside. My guess is that the island
mechanic used the old gaskets and water leaked into it.
I also did not know about having to run it on high speed. I ran it between 1500 for
motor sailing and 2100
RPM.
Another theory by one
mechanic was that the amount of saltwater left in the rather long exhaust hoses and pipes (6ft up from engine and down, then 6 ft to exhaust
elbow, seawater hose up 6 ft and 3 ft to exhaust)would get into the turbo charger. I doubt that.
I ran it high, enjoying the good speed, 7.2 knots at 2800 to 2900 RPM until I ran out of 120 gallons of
fuel in 23 hours. 5.5 gall p. hour compared to my previous 3/4 gall/hour. Then running at 2100 to 2300 RPM and 6.5 kn in calm water I used 1.5 to 1.7 gall p hour.
My previous Perkins 63 HP, no turbocharger gave me 7.2 kn at 1 gall p.h.
So the turbocharger on the Yanmar is a bad choice for a sailboat (displacement 19 t
Endeavour 43
ketch, 18" Maxprop).
But now that I have it, how do I maintain it?
It is made out of rusting iron and already shows rust after 2 weeks. But saltwater had sprayed over it from the seawater little nipple on top of the riser of the seawater hose. I attached a hose to that to lead the spill into the
bilge. But I assume the same
corrosion happens inside.
Thanks for your
advice
Wolfgang
Linear Mode
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