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Please Help Me Diagnose This Noise!

Discussion in 'V7/V85/V9 Chat & Tech' started by DETRoadster, Jun 11, 2019.

  1. DETRoadster

    DETRoadster Tuned and Synch'ed GT Contributor

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    Hey Guzzi fans, hoping someone can assist me in diagnosing a super annoying and increasingly louder noise on my V7-1 Racer. The noise as best I can describe it is a fast, somewhat random, chirping. It occurs only in 1 very specific scenario, as follows:

    - No throttle input
    - Clutch engaged (ie, clutch lever not pulled. ie, hand not on the clutch lever)
    - In gear

    I'll most commonly hear it when coasting down a slight hill, engine braking. As soon as I disengage the clutch (ie, pull the clutch lever in) it goes away. As soon as I give it a little gas it goes away.

    It's like something in the clutch/pressure plate assembly maybe has some slop in it and is rattling around and chirping. Adding throttle or actuating the pressure plate provides enough torque to force things into place and quiet it down.

    Any ideas?!
     
  2. kenrover

    kenrover Just got it firing!

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    How's the free play on your clutch lever?
     
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  3. DETRoadster

    DETRoadster Tuned and Synch'ed GT Contributor

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    Well now there's an obvious thing to check. How did I overlook that? I'll take a peek at it tonight. I replaced the cable last year and haven't touched it since. I'll bet it's loose.

    Thanks!
     
  4. kenrover

    kenrover Just got it firing!

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    I was thinking more like you don't have enough. Start at the lever on the back of the gear box that does the work ( back off the bar adjuster first) and then take up final minor adjustment at the bar. Give anything that moves some lube while you're under there too.
     
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  5. DETRoadster

    DETRoadster Tuned and Synch'ed GT Contributor

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    Oh, I see OK. I'll give it a shot this weekend! Thanks!
     
  6. DETRoadster

    DETRoadster Tuned and Synch'ed GT Contributor

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    Finally got some free time to match up with the tricky Seattle weather. Adjusted the clutch cable super tight. Noice did not go away. Then tried it super loose. Noise didn't go away. So clutch cable tightness seems to not really impact the noise. What is consistent is that I only hear it when I'm engine braking. Under load, no noise. The second I pull the clutch lever in the noise stops.

    Any other ideas folks??

    Thanks!
     
  7. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    The description sounds like what some of the 750 Brevas would do. Just so you know, no one ever found the cause on those bikes either.
     
  8. DETRoadster

    DETRoadster Tuned and Synch'ed GT Contributor

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    I’d actually be ok with that. The noise is annoying but if it never manifests itself as anything else I’d be ok. I have this fear of the clutch assembly grenading itself at 80mph on the freeway.
     
  9. Godfrey

    Godfrey High Miler GT Famiglia

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    The worst that might happen is that a throw out bearing goes bad and will eventually make a lot of noise, long before it "grenades" or stops working.

    My Racer makes a number of amusing noises, just like my LeMans V and Sportified 850T did. I mostly ignore them and just ride. Nothing's ever broken... :D
     
  10. DETRoadster

    DETRoadster Tuned and Synch'ed GT Contributor

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    Definitely been there already with the TO bearing. That failed at 4,000 miles. Lots of squealing with the clutch pulled in. I was amazed when I saw the size of the thing. No bigger than a nickel. No wonder it failed. That may be what's going out again, though it's odd that it's making noise when the clutch level is pulled. When it went out the first time it was the opposite, which is what i'd expect of a TO bearing.

    Do our bikes have pilot bearing in the end of the crank that the nose of the transmission input shaft engages with?
     
  11. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    No pilot bearings used with Guzzi bikes. The pressure plates on all of these machines are pressed from the center by the clutch push rod. No fingers or forks like an automotive clutch system.
     
  12. DETRoadster

    DETRoadster Tuned and Synch'ed GT Contributor

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    And it looks like that pushrod goes straight through the center of a geared shaft. Funky. I wonder if it’s the clutch release pushrod rubbing inside that geared shaft.
     
  13. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    Hard to say. With the seals on the push rod, it should be turning at shaft speed but I guess it is possible.
     

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