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V7 Sport catastrophic failure

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Dukedesmo:
Yikes, catastrophic indeed.


I'd be amazed if there wasn't some piston to valve interface on at least one cylinder. My LM2 had a piston to exhaust valve interface for no obvious reason (timing and clearances were good and nothing broke), possibly sticking valves or over rev? I'll never know.


But the engine didn't stop, rather it just lost power and got me home for me to find 'mildly' bent (both) exhaust valves and ultra-low compression.


Similarly, my Son's car had the cambelt 'stop', didn't actually break, rather the teeth around the crank pulley sheared off so it just stopped turning but, all the exhaust valves were bent.


Whatever damage it did, hope it's not too serious/expensive to fix, good luck.

Huzo:
Are they original gears or retro fits ?

Missionguzzi:
Thanks for all of your responses.  I believe the timing gears were original, but who knows what might have happened in the past 53 years?  Yes, indeed, the right side exhaust valve was slightly, visibly bent, and the intake may have "kissed" the top of the piston.  Left side looks OK, but I plan to disassemble to check and lap the valves anyway.  With luck, the camshaft is still good.  I know it's unique and more aggressive than the T/T-3 cam, so would be nice to retain it.  I'll have to count the gear teeth on all 3 gears to try to find a matching set.  I don't really know if the other gear teeth configurations would work, as long as they're part of a matched set.  I don't know why not, but it could make valve timing more difficult.  I sure wish I could retrofit a timing chain to this crankcase, but the oil pump won't allow that.
Thanks again for sharing your thoughts.  Hope I can get this back together correctly and help this old Sport get back on the road.

JoeW:
As far as I know, the cam gears are the same in the Sport as the Eldo and Ambo. The crank gear is different. I know that the gears are listed as sets in all the parts books but, they are not coded as "matched" sets. I have mix gears with no issues, especially when I see a large hole cam gear.

Missionguzzi:
Joe W, I found a complete set of gears identical to the broken ones.  I believe the cam gear is the "small hole" type, based on pictures I could compare. And the gear that broke is also the small hole type.  I guess they weren't immune to defects.
If possible, could you elaborate on what's different about the crank gear?  It seems like that would have to be a fixed shape, considering the slot for the woodruff key.  If it's different, what should I look for?  Thanks again for all the help.

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