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Cummins ISX engines

F

fixerupper

Well-known Member
Did the first ISX (updated smog version of the N-14) Cummins truck engines have STEEL pistions and ALUMINUM sleeves? My son was talking to a truck owner who said he had a couple of trucks with these engines, and he said they weren't very reliable because of steel pistons and aluminum sleeves. I've never heard of this in a big engine, or was he jerking my son's chain? Reminds me of a lawnmower engine!

Gotta go, will be back this evening. Jim
 
It will have a cast cylinder sleeve.it may also have a steel piston crown as steel has higher melting point than aluminum. The piston skirt could be made from aluminum or cast iron. I have not seen one apart . A detroit has a two piece steel or cast and steel piston. an aluminum cylinder sleeve would not be able to take the pressure or pounding of truck engine.Paul
 
I looked it up and they are a steel piston.According to what it said they were one piece for the ISX.The early N-14s had 2 piece pistons and later one piece pistons.The 2 piece pistons could have had aluminum skirts and a steel top.As far as I can tell the liners are all steel.N-14 liners are not black like the old ones but shiny,hard steel like Caterpillar liners are.They arent aluminum,but shiny steel most likely.I dont see how that they could make liners,in a big diesel engine out of aluminum and keep them from melting.I had a N-14 that didnt burn any oil between changes for 500,000 miles and I know those liners are hard steel instead of the old black cast ones the older Cummins had.

Seems like all of the engines like Cat ,Cummins and Detroit went to a hard shiny liner in the 1990s.I dont know about the newer ones.Ive never seen an ISX apart.Ive drove a few trucks with an ISX engine in them and they didnt burn oil so Id say they have steel liners,and it sounds like steel one piece pistons as well.
 
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