LO consumption high Wartsila 46 Engine

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mdjahirul
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LO consumption high Wartsila 46 Engine

Post by mdjahirul »

Hi,

I am Jahirul. In recent treads we found that LO consumption is high on Wartsila 46 engine compared to previous. Present consumption is 0.95 gm/kwh where as previous it was 0.65 gm/kwh. We checked the separator. Its okay. What checking should be done on engine side?

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pradeep6096
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Re: LO consumption high Wartsila 46 Engine

Post by pradeep6096 »

1)did u overhaul gene, if yes then maybe scrapper ring is inverted
2)one vessel turbochrger seals were kaput and were loosing lub oil there, how is the general condition of lube oil
3)check pcomp pressure after discoonecting the racks, if have different values then chances of loosing oil due to broken rings or ovality of liner
4)stem seals in cylinder head
5)ensure drain valves are properly shut
right now can think of these things, do check and update

Big Pete
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Re: LO consumption high Wartsila 46 Engine

Post by Big Pete »

Hi there,

Long ago everyone used to hone cylinder liners, when overhauling engines, then some Engine makers started to produce piston rings which they claimed did not require the liners to be honed.
In my experience, the cost of honing the liners is much more than covered by the saving in L.O. consumption.
Some years ago I sailed on a ship with twin 6 cylinder MAK engines, which were using the special piston rings and not honing the liners. Ove a period of years the L.O. consumption steadily increased until we started honing the liners again, then the Super produced a very pretty graph showing how our L.O. consumption dropped each time an individual liner was honed on overhaul and proved conclusively that paying for a shore side squad to hone the liners as they overhauled each unit, and demonstrated clearly that despite the special rings, honing more than paid for itself in reduced oil consumption.
It is always better to ask a stupid question than to do a stupid thing.

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Merlyn
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Re: LO consumption high Wartsila 46 Engine

Post by Merlyn »

Glaze Buster Boy.
Me too.
Many happy hours doing that, chasing that barrel effect.
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.

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Merlyn
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Re: LO consumption high Wartsila 46 Engine

Post by Merlyn »

Further to BP's comments re ring/liner contacts I well remember in the mid seventies the advent of chromed liners.
Chromard was the trade name.
The chromed liners being much harder than close grain cast iron liners rapidly accelerated ring wear.
Plus of course no graphite being present in chrome liners did not help the situation unlike the close grain cast iron liners who did of course have graphite present necessary to assist the lube. situation.
Then advancement announced chrome rings with cast iron liners.
Some variations had the top two or three compression rings chrome with the third ring being a cast iron oil control ring.
The lower ring down on the skirt was of course the scraper ring being made of cast iron.
However the chrome present in whatever format did not possess the graphite impregnation that cast iron possessed so after a few years of constantly changing liners and pistons it was back to close grain cast iron all round.
It was around this time that we decided the old strongback method of pulling liners was hard work so our first hydraulic kit was purchased so for me some good came out of the Mr Chromard era.
Then of course came the advent of synthetic oil which of course extended oil changes and piston/liner changes so you now do not have to take your fancy liner puller with its 101 mandrels every where you go ( both metric and imperial )
Again back in the old days mandrels were all imperial but nowadays its nearly all MM out there.
( Micky Mouse that is )
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.

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