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Old 14-08-2018, 08:26   #1
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Yanmar - chirp chirp - tweet tweet

I have a yanmar 3hm with 1500 hours. Recently noticing chirp/tweet noise at low rpm/idle. Noise goes away at higher rpm under load or no load. Belts are tight and water pump">raw water pump just rebuilt. Any ideas what this noise might be? And how to tell? Thanks in advance.
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Old 14-08-2018, 18:26   #2
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Re: Yanmar - chirp chirp - tweet tweet

stethoscope
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Old 14-08-2018, 18:45   #3
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Re: Yanmar - chirp chirp - tweet tweet

Oily alternator pully. Run the engine for a while and itíll go away.

Unless itís not the pulley.
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Old 14-08-2018, 18:58   #4
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Re: Yanmar - chirp chirp - tweet tweet

I think itís normal for a loaded down alternator charging the bank, I know mine does it, I have a serpentine belt. Watch for belt dust, that may indicate a worn belt.
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Old 14-08-2018, 20:38   #5
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Re: Yanmar - chirp chirp - tweet tweet

Is the shaft seal getting sufficient water? I found out the hard way that a squeaking might be caused by a leak and then lack of proper lubrication.
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Old 16-08-2018, 02:52   #6
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Re: Yanmar - chirp chirp - tweet tweet

The serpentine belt kit from Electromaax was one of my best boating buys ever. Works a treat. No more dust everywhere. No more constant belt replacement. No more squeals. Really helpful company too.
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