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Ducati 748 Oil Ring

Discussion in 'Builds & Projects' started by Masterharps, Apr 26, 2021.

  1. Hi guys I recently purchased an old 748 engine to hopefully replace the one I have.
    I have already done loads to the engine, repaired the stator, removed about 4 rounded bolts, split the engine and removed all paint down to the aluminum for a respray.
    Mains and big end bearings seem to be good but I might as well replace these while its all apart.
    However I manged to break the one of the oil piston rings on the vertical piston while cleaning with a piece of blue roll :oops:
    I don't suppose anyone has a spare 748 oil ring they could sell me or point me in the right direction.

    oil ring.jpg
     
  2. Is the piston/bore the original or over-size/aftermarket. You really need to measure the bore, accurately, first to be sure you get the correct size ring assembly.
    Once you know if the bore/piston is standard or an over-size you can then look for a replacement. Any replacement wants to be new in my opinion, (second hand rings will be "bedded" in to the bore they came out from & not your bore). I would also look to replace all three rings on that piston personally, others might have different views on this.
    Ideally that bore would need a quick hone too, to help the new ring/rings bed in.
     
    • Agree Agree x 1
    • Thanks Thanks x 1
  3. [​IMG]

    I'm not sure that a 748 runs the same brand of oil control rings as a 900ss/900 Superlight but I had the same problem as you when I went to refit barrels, I broke a ring. I checked locally(Australia) for ring availability and was quoted $410 for a full set of rings and I only needed the oil control ring. So after hunting around I found the same brand that Ducati use (Caber Sri) available on eBay from Greece in all sizes(bore diameter and ring thickness) and the cost was $13Aust each. I hope that helps.
     
    • Useful Useful x 2

  4. Thanks I have just seen this. I am still on the hunt for one. I can't seem to find any Caber Sri rings. The bore is 88mm and the oil ring is 3.0mm width
     
  5. If it’s std bore, a oem set from Ducati isn’t that expensive. I would let a specialist take a look into the bore, before a re-hone.

    40A585C4-B4B2-4E64-ACDE-8DB300C27487.jpeg
     
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