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Anyone recognize this engine sound?

uncle-buck

New member
Been working on my 1990 Ski Nautique with the PCM Ford 351 engine. Saturday, I noticed a strange clanking while the engine was running on the FlushPro in the driveway. Sounds like it's coming from the top of the engine and it continues for about 30 seconds after the engine has been turned off.
Any ideas on what it might be?


Here's a link to a 15 second YouTube video of the issue:
https://youtu.be/wwI71VIIzVo

I pulled the plugs this morning and did not see signs of moisture on them.
Also, checked compression. Low was 133, high was 145, avg. was 138.
And did not see any signs of water coming from cylinders with spark plugs out.

The clanging also happens after the engine is turned over without the spark plugs in.

 
Can't say I've ever heard that particular series of noises...

Was going to suggest something thermal until your last sentence (assuming a cold engine)....

This will be a good one...
 
Maybe try, Unplug your electric choke and see of it goes away. Or, remove carb spark arrestor and see if choke is moving. I'm thinking that your choke spring to be faulty. Maybe as it is cooling down and wanting to reverse coil direction, it may be getting interference.
 
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