Clanging noise

[KellyR]

I started up the listeroid for the first time in months (had taken the cooling system off to repair) and there's a very loud clanging noise come from it.  I've checked to make sure the bolts holding everything down are tight.  The flywheels are on securely.  The valves are more or less where they're supposed to be.  Any ideas?

[KellyR]

I've posted a video of the engine.  Unfortunately, the clanging sound doesn't come through too well.

http://www.youtube.com/watch?v=rk_Osa1nZCE

[mike90045]

I'd at least open the front hatch, and get my hands all grubby, wiggle things around, including the camshaft and idler gear,  and don't run it anymore till you bless it.  Might be as simple as a chunk of carbon flake off the piston top, or ....

[Tom]

Yes carbon will make an ugly noise, but usually not for long. It sounds more like a knock than a clatter though. I'll second the check the cam and idler gear call.

[buickanddeere]

   Sounds like a high combustion chamber pressure spike?
   Is the injector shooting a atomized puff of fuel or a dribble/stream?

[cujet]

Injection pump timimg?

[KellyR]

I haven't checked the timing or the injector.  The insides look fine.  Nothing's wiggling like it's not supposed to.

[KellyR]

Timing looks fine and the injector is spraying a nice mist.  Hmmm.