Maritime Discussion: generators

Message

 
        In my last ship my generator was dihatsu.
In the piston it was seen that there were two scraper rings,one below the gudgeon pin and the other just above the gudgeon pin,if this was so,then how was the compression rings above the scraper rings were getting lubricated?

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somraj roychoudhury Jobships Member Location: west bengal Posts: 2	Topic: generators Posted: 24 Jul 2007 at 10:04pm
	In my last ship my generator was dihatsu. In the piston it was seen that there were two scraper rings,one below the gudgeon pin and the other just above the gudgeon pin,if this was so,then how was the compression rings above the scraper rings were getting lubricated?

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PERI AVADHANI Jobships Member Location: Andhra Pradesh Posts: 4	Posted: 19 Oct 2007 at 7:05am
	Hi, The cylinder lubrication is carried out in this particular engine is by applying oil on the cylinder surface between the scrapper rings. By doing so using the small pores in the cast Iron liner holds the lub oil to lubricate the rubbing surface between the rings and the liner surface to reduce the friction. ( in the case of the Crome plated liner the honed surface does this work- and this is the function of the honning we do on the generators.) Cylinder lubrication is not effective when the cylinder pressure is high or the combustion is being carried out. Best Regards,
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ved prakash Jobships Member Location: uttar pradesh Posts: 2	Posted: 29 Jul 2010 at 6:13am
	the upper scraper ring serves the purpose of spreading lube on the liner surface and scraping the oil also. this lubrication is valid for all loads and combustion conditions as long as lube oil pressure is more than 3.5 kg
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Engineering
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Topic: generators