Single Scored Liner - MBN Cat
Discussion in 'Trucks [ Eighteen Wheelers ]' started by underpsi, Jun 28, 2013.
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That just sux, my 2 cents I only use ome piston cooling nozzles because I've had bad luck with non genuine ones. But your issue looks like over fuelling / over heating in that bore. Hope you get it fixed.
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To me the 2 piston cooling nozzles are not the same. To check, I would find something flat, not diamond plate, C-clamp them both down side by side and use a carpenters square or something similar to compare the angles. The top picture in your set shows some blueing close to the oil drain back hole under the oil scraper ring. The second pic shows some sign of blueing but not as bad. The second sprayer on the cooling nozzle is designed to spray oil in the egg shaped hole on the bottom of the piston in pic #2. It doesn't look like it was getting oil in that hole from the discoloration.
Also who put the engine together? Did they check the ring end gap clearance or the side gap clearance before installing the pistons in the liners? You might have had to tight rings, that will also cause cylinder scoring with low miles like you had. -
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15 over said: ↑You for sure have an over heating problem on that cylinder. I would have that injector checked to see if it was in fact over fueling. If it is I would raise cain with the supplier to warranty not only the injector but also the parts that it made fail.
To me the 2 piston cooling nozzles are not the same. To check, I would find something flat, not diamond plate, C-clamp them both down side by side and use a carpenters square or something similar to compare the angles. The top picture in your set shows some blueing close to the oil drain back hole under the oil scraper ring. The second pic shows some sign of blueing but not as bad. The second sprayer on the cooling nozzle is designed to spray oil in the egg shaped hole on the bottom of the piston in pic #2. It doesn't look like it was getting oil in that hole from the discoloration.
Also who put the engine together? Did they check the ring end gap clearance or the side gap clearance before installing the pistons in the liners? You might have had to tight rings, that will also cause cylinder scoring with low miles like you had.Click to expand... -
Feeler gauge for ring end gap and ring to groove clearance.
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Outside of the liner looks good
Inside, not so much. Hard to see in the pic but theres little heat cracks in it like you'd see in a drum.
There is traces of oil in the oval shape of the piston
I also inspected the injector in good light today but theres no evidence of anything wrong with it from the outside. Obviously it could have an internal problem so I'll have to get them tested.
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