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V7III Blown Engine?

Discussion in 'V7/V85/V9 Chat & Tech' started by avlis, Sep 17, 2018.

  1. avlis

    avlis Tuned and Synch'ed

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    Just 1 mile from home, everything was going well then I decided to pull into a side street to turn around because I forgot something at home. Slow speed u-turn at idle then a small click and stalled engine in 1st. I tried restarting but the starter just spun freely, like it wasn't connected to the engine. While waiting for the tow truck I found this sensor (cam or crank sensor?) was blown off the front cover. The cover is cracked along the top too and separating from the engine.

    IMG_7827.JPG IMG_7826.JPG
     
  2. Bill Hagan

    Bill Hagan GT Reference GT Famiglia

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    THAT is astonishing.

    Keep us posted.

    Buon fortuna.

    Bill
     
  3. avlis

    avlis Tuned and Synch'ed

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    Bike has been pretty flawless for 1200 miles. I'm not familiar at all with the internals of this engine and haven't found a diagram of what's behind this cover. What could contact the crank sensor with such force to blow it right off the engine? Surprised there wasn't a loud bang or thrashing before/after. It stalled on its own just off idle then nothing. I fear a broken crank because I *think* the bike rolls free in all gears with the clutch engaged. Starter spins like there's zero compression.
    It should be covered on warranty but the shop is closed today. Just wondering if anyone has seen this or has guesses on the cause...
     
  4. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    It looks like you may be getting a replacement engine. I would think Moto Guzzi would want to study that failure. Taking a piece out of the block at the cam position sensor just shouldn't happen. It is possible the cam chain failed and hit the block hard enough to do this but you will only find out on disassembly
     
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  5. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    Whoa! Can you post your VIN and engine # on this thread for us?
    It doesn’t look like there was any impact to the sensor that I can see, so something in the timing chest has come loose if it spins freely, and/or the engine casting just failed (but you’d still have compression). Do keep us updated. Which dealer?
     
  6. Raven

    Raven Cruisin' Guzzisti GT Contributor

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    In the second picture there is a large gouge just above the sensor you are holding. It looks like it may have been struck externally. It could have happened previously and decided to let go as you turned around. It seems unlikely though as you stated there is no compression which points to an internal issue.
     
  7. avlis

    avlis Tuned and Synch'ed

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    Here's a better photo. Looks like the timing chain broke and the whipping action broke the cover. Rolling the bike in gear there is a little drag compared to disengaging the clutch.
    Dealer is Seacoast Sports in NH. I had some long-ish trips planned for foliage season. I hope my riding season isn't over waiting for repairs.

    IMG_7829.JPG
     
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  8. Trout

    Trout GT Reference

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    Wow, that's all I can think of to say.

    Really hope you will keep us posted.
     
  9. avlis

    avlis Tuned and Synch'ed

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    Being loaded in the ambulance. :cry:
     

    Attached Files:

  10. GuzziTex

    GuzziTex Just got it firing! GT Contributor

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    What year and model V7 III is this?
     
  11. Mayakovski

    Mayakovski Cruisin' Guzzisti GT Famiglia

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    It's a 2018 V7III Racer.
     
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  12. Godfrey

    Godfrey High Miler GT Famiglia

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    I'm sure it will all come out right in the end. An unusual failure, for any make of motorcycle today. Do keep us all informed as to what the diagnosis is once they've had a chance to work on it.
     
  13. Android

    Android Cruisin' Guzzisti GT Famiglia

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    Yep cam chain is not on its sprocket
    On the older bikes it's a duplex chain, wonder if they went single row on the new ones.

    As it's just the cover that's broken you could be back on the road quite quickly, lets hope ......unless it's bent a valve which could be why it spins over so easy.
     
  14. avlis

    avlis Tuned and Synch'ed

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    Failures happen. This is my first motorcycle and is a toy, a luxury. The dealer has been responsive. Can't ask for more. (I do wish I asked for a loaner bike tho :smirk:)
    Mostly I'm glad to learn that this failure is unusual.
     
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  15. GuzziMoto

    GuzziMoto GT Reference GT Contributor

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    While I hope it is an easy fix, a basic question is; Did the cam chain fail first or did something else fail and cause the cam chain to fail. We had that once on a Ducati, only it was a cam belt, not a cam chain, that failed after things went south on one of the two cylinders. The belt snapped, but I don't think that was what started to failure.
    I wonder, because cam chain failures are really rare nowadays. Cam chains are usually a lifetime part.
     
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  16. roadscum

    roadscum Cruisin' Guzzisti

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    I like your attitude, good on ya. :happy:

    Paul
     
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  17. Godfrey

    Godfrey High Miler GT Famiglia

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    All the "small block" motors have had single row cam chains since the beginning. They don't have a particularly notable history of failure as far as I recall, but it is always possible for a particular engine to have defective part and a failure to happen. I've seen cam drive failures on many different machines, even if they are fairly unusual.

    The usual failure on a belt drive is for a tensioning roller to seize up, then the belt either strips or is overheated (depending on which side of the belt that roller works) then flies apart. Cam chains usual wear from having become too loose, either through high mileage or over-revving abuse, and when they let go, they tend to jam up and break a piece of the cover and/or engine casting on the way.

    It is a very unusual failure for a new bike which hasn't been abused, but of course any part can be defective.
     
  18. GuzziMoto

    GuzziMoto GT Reference GT Contributor

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    Our Ducati timing belt failure was on a near new (second race weekend) 996. The valve train for the rear head seemed to have locked up. The rest of the motor kept going, so the timing belt for the rear cylinder snapped. But there are a variety of reasons that something like this could occur, ranging from a defective chain / belt, to improper adjustment / tension, to other parts failing and causing a chain of failure.
    I hope the OP's motor is sorted out and repaired or replaced under warranty to his satisfaction.
     
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  19. roadscum

    roadscum Cruisin' Guzzisti

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    Perhaps it was a late Friday afternoon build and Guido was anxious to get home to diner, vino, and his lovely wife Gina.
    Sometimes shit just happens, this is likely one of those times.

    Paul
     
  20. avlis

    avlis Tuned and Synch'ed

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    Dealer is trying to order a replacement engine. There's a V7III in a warehouse but its different in that the racer has exposed edge cooling fins. I told them I'm interested in a carbon dark engine if one of those are available.
    No word on the cause. I don't think they want to waste time opening it up and doing a post-mortem if the entire engine is being replaced anyway. They want me back on the road asap.
     

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