On Sunday the port engine sounded like it was coming apart. BANG BANG BANG!  Metal to metal. I shut it down and removed the spark plugs and tried to turn  the crankshaft with a wrench, but it was locked up.  Yesterday my mechanic was able to break it free with a wrench and turn it over freely. So we put the plugs back in and turned it over several times with the starter.  When that worked OK we started the engine and it ran fine on all cylinders.  Other than possibly a bolt loose in the bell housing and chewed up by the flywheel he's not sure what to think or do. 

Any suggestions?

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An oil analysis would either confirm or deny if the engine failed. Then at least you would know what to fix, without having to tear anything down.

I've never had an analysis.  How would this show a failure?

It will show you the metal content in the oil. Different metals indicate where 5he problem may be.

George Davidson said:

I've never had an analysis.  How would this show a failure?

If there is no metals in the oil, the engine is not causing the rattle. Blackstone is one source for an oil analysis.

You might remove the starter motor to expose the flywheel and check for damaged teeth,a bore scope to see if any debris is present could be used also.A magnet with a flexible shaft could also be used to retrieve any debris in area.Guy at our marina had same type symptoms and used my magnet to remove some large pieces of debris turned out to be a flex plate problem.

I had Springs in the flex plate ( mounted to the flywheel) come apart and it sounded like my engine wa coming apart.

My mechanic thought that it might have been the springs in the flex plate.  What did you do to repair?

Transmission / bell housing will have to be separated from engine. A new flex plate can then be bolted back on flywheel.

Wonder if a small scope can be used to see if a spring has come loose?

I don’t see why it couldn’t. You probably won’t be able to see the springs on the damper since the trans will be in the way, but you can look for pieces in the bottom of the bell housing. If you have a 327F you can pull the trans without messing with mounts.

George Davidson said:

Wonder if a small scope can be used to see if a spring has come loose?

If it's a spring, and it sounds like it, it probably lodged between the bellhousing and flywheel and locked it up.Thus the reason you got it loose and it ran fine. It WILL do it again. If you find one missing with the scope run a pocket magnet in thru the starter opening or remove lower dust cover and retrieve. Good Luck!

"It WILL do it again".  Right about that!  My engines are 327F's with Paragon transmissions. Will I be able to find a replacement damper if that is where the springs came from?

Lee H. Dahlen said:

If it's a spring, and it sounds like it, it probably lodged between the bellhousing and flywheel and locked it up.Thus the reason you got it loose and it ran fine. It WILL do it again. If you find one missing with the scope run a pocket magnet in thru the starter opening or remove lower dust cover and retrieve. Good Luck!

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