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V65 SP crankshaft bearings

Discussion in 'Chat & Tech Info' started by Dodgindirt, Jan 23, 2019.

  1. Dodgindirt

    Dodgindirt Just got it firing!

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    I am rebuilding a 1984 Moto Guzzi V65 SP (650 cc) and have run into an issue. My old bearing (both ends of the crank) have pliastiguaged at 3/1000 so I purchased new ones and they were no better. Where can I get new under sized bearings to get the reading within spec? What is the maximum tolerance for the bearings in this situation??? Can you run it with 3/1000 clearance with this Guzzi engine? Tolerance is under 2/1000.

    Tim
     
  2. V700Steve

    V700Steve High Miler GT di Razza Pura

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    Yes, there is an oversize main front & rear. It is .015mm oversize. It is for undersized cranks
    Front o/s main P/N #GU19065668
    Rear o/s main P/N #GU19066568
    Have your crank ground to meet Minimum specs in Service Manual
     
  3. V700Steve

    V700Steve High Miler GT di Razza Pura

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    IN Luck --- TLM has them
    https://www.ebay.de/itm/Moto-Guzzi-BEARING-SHELL-190665680000-GU190665680000-GU19066568-190665680000/132394176255?_trkparms=aid=222007&algo=SIM.MBE&ao=2&asc=20160323102634&meid=2dfb313d794747259fccae2ec1e1e23c&pid=100623&rk=3&rkt=6&sd=132378057495&itm=132394176255&_trksid=p2047675.c100623.m-1

    AND
    https://www.sectwoutlet.top/sonstig...665680000-gu19066568-190665680000-p-9783.html
     
  4. Dodgindirt

    Dodgindirt Just got it firing!

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    Thank you very much. I was having no luck. I ordered these and will sort it out from there.....unless I have another question:). Cheers.
     
  5. Ivan_J

    Ivan_J Just got it firing!

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    V7III engine manual states 0.08mm max clearance for front journal and 0.09mm for rear. Diameters are the same as V65 so if you're within these numbers you're fine.
    What problems gives you bigger clearance?
     

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