What are the symptoms of the main bearing going out?

[Bob]

That description sounds painfully familiar from when I bent #2 rod due 
to misfiring.

Phil Payne wrote:

>>My 91 200 20V has a knocking coming from the oil pan. Actually sounds 
>>    
>>
>like something is hitting it from the inside.  The sound has a patter of 
>three quick knocks followed by a second or two of no knocking, then 
>repeated again. Is this a sign of the bearing spinning?
>
>Oil pickup pipe has come loose?
>
>I'd advise dropping the sump pan IMMEDIATELY.  If that thing really comes 
>loose, it can snap conrods and puncture the block and sump.
>
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