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OEM diesel pistons sleeves versus aftermarket pa
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Posted by jdemaris on March 18, 2005 at 20:46:24 from (209.23.28.81):
I'm wondering how you could ascertain the difference in quality between OEM pistons and aftermarket - if there is any. I've been working on engines for 40 years - but - when it comes to diesel engines in tractors, I never gave it a lot of thought - I've assumed replacement parts either from the dealer or aftermarket are designed to OEM specs and the engineers have done there work. My concern is particularly with diesels because of the higher compression ratio and ether use.
I rebuilt a little 152 Deere engine for a friend last year in a 350 dozer. He had previously shattered all the top piston rings from ether use - but the engine had a lot of hours on it anyway - so it was no big deal. I've seen MANY Deeres with no tops rings left at all. I've also seen the same on many other diesels, especially if they have conventional square-cut top piston rings. Keystone rings seem to hold up much better.
Anyway, point to my story is - we bought aftermarket parts from A&I. Well, the guy ruined the engine again. Had no block heater on it this engine, wanted to use it several times this when it was very cold, and loaded it up with ether to get it running. The difference this time though, is the pistons are in pieces - shattered. As I said, I've seen lots of top rings shattered, and piston grooves with gouges in them, but I've never seen fairly new pistons break apart like this before. So, now I'm wondering about quality. The pistons that Deere sells must be made for them to certain specs. Maybe forged aluminum or Mahle - I don't know? So, my question is - does anyone know of a way of identifying the piston materials and comparing? I may go back to the guys place and do a few tests by smashing some pistons with a hammer and see how they shatter. Not very scientific, but - I think forged aluminum is grainy, and cast aluminum is crystaline. I don't know what the actual construction is for the OEM parts, but in this case, they seem to be quite a bit more rugged.
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