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Old 26-02-2021, 16:02   #16
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Re: "Tap tap" sound from engine/alternator belt?

In the old shipyards, a riveter may have been trapped between sheet steel structures. To escape they would tap on the steel plate to make other workers aware of their dilemma.
So maybe there was a "gremlin" locked inside the engine and is now seeking escape and freedom.
I once had such a gremlin but it turned out to be rattling of adjacent steering cables. But it had me worried for some time.

Might I humbly suggest that you check if the noise has the same frequency as the engine RPM or if it matches the belt frequency. i.e. use a White-out blob on the belt. Also on the harmonic balancer (that front wheel that's connected directly to the crank shaft), the engine water pump, the alternator fan blades etc. Run the engine and see which one matches the tapping rate.
The wooden stick can also work but the white out blob is probably safer.
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Old 26-02-2021, 16:12   #17
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Location: Florida, heading north soon
Boat: Alberg 30 #104
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Re: "Tap tap" sound from engine/alternator belt?

Warm it up, pop the belt off and run it for about 15 sec and see if the noise goes away. You can also check the alternator, water pumps, and idler pulleys for any bad bearings.
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