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748 A Whirring 748s Engine

Discussion in '748 / 916 / 996 / 998' started by Geoffhogarth, Jun 23, 2018.

  1. Well, bike is back together with the new Ducati belts I mentioned above, tensioned with the 45 deg twist method.

    After replacing the bad bearings, missing spacer etc, the bike fired up first touch after first pumping the oil round with the plugs out.
    Problem is the whirring is still there, now there are only 2 more things in my mind, timing shaft bearing or a main bearing as mention in the very first reply to my original post by @final_edition

    It's taken a month since my original post, but this pensioner has plenty of time on his hands, so disassemble and remove the motor looks like the next step, maybe I can have it ready for winter :)
     
    #61 Geoffhogarth, Jul 24, 2018
    Last edited: Jul 24, 2018
  2. Bugger :(
    I wondered if you might have done all this stuff and still have the original problem.
    What a bummer.
    Impressed with your skills and get stuck in attitude :)
    Should have used Exact Fit and the Gates CarbonDrive app for tension though imho...
    ;)
     
  3. If you read the thread at the very top, I fitted those belts and used that app in the beginning ;)
     
    • Like Like x 1
  4. I did read it from the top but in real time as it were, so forgot - sorry.
     
  5. That’s right Jeremy, get with the beat baggy :upyeah:

    EDIT ^ charitable reply for me back then and with reference to following post (#66) you just really needed to drop it/move on with the belt thing mate..
     
    #65 Chris, Jul 24, 2018
    Last edited: May 9, 2022
  6. Just been re-reading.
    As the minimum in-service tension recommended by Ducati North America is allegedly 70Hz, before splitting the cases, I wonder if it's worth setting the belts to say 80Hz, just to see if it makes any difference.
     
  7. 0BC24C29-A288-45E8-82C9-6E052B2258FC.jpeg
    Its had old belts back on, new exactfit and new Duc belts set at different tensions using different methods, I am done with belt senarios thanks.
     
    • Agree Agree x 1
  8. I've a feeling FE was correct unfortunately :(
     
  9. I thought that mains would have made more of a rumbling noise than a whirring noise...
    Best of luck
     
  10. Hope the pivot bolt comes out without any trouble.
    Steve
     
    • Agree Agree x 1
  11. Yes I thought that as well, but they are thrust roller bearings for side thrust, dont know if that makes a difference? To be fair, there is quite a lot of vibration down there especially when releasing the throttle.
    Waiting for a puller now for the primary drive gear, a strong 2 leg puller, tightened as much as I dare, some heat, and a 3lb hammer on the puller bold head did not move it so far! I split the cases anyway, checked the gearbox and stored it away, left side bearing appears to be good, right side sounds rough but cant get it out until I get the puller. In the meantime, cleaning it all up, chasing all the screw holes etc....
     
    #71 Geoffhogarth, Jul 26, 2018
    Last edited: Jul 26, 2018
  12. A doddle when you have the right tools Steve, thanks.
     
  13. Looks like so far, bless him.
     
  14. He knows his onions that one :eyes:
     
  15. If it's out then well done, the bike must have been well looked after in the past, even with the right tools they can be a real pain to remove and can take days, I remove mine every service and grease it just in case, they can rust and get stuck in a very short time.
    Steve
     
    • Agree Agree x 2
    • Useful Useful x 1
  16. I guess, but he dosn't say much in this thread, just one important word :upyeah:
     
  17. He doesn't say more than is necessary :eyes:
     
  18. Sounds like a good plan that for the future, to keep on top of the corrosion in there.
     
  19. Here's the latest, a video of the crank and right side bearing..
     
  20. The last consulting job I had in the oilfield was around 1600 a day before I retired, forget the free room and lodge I can sleep in my van:zzz::yum
     
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