So I have this boat - a Bertram 28 - It was my stepfather's boat -
Twin 1986 Inboards - 260HP 5.7 Mercruisers (1600 hours)
The Port Engine started making this noise - and I can not figure out what it is.
Changed the oil - and filter - no metallic pieces in the oil. (I have not cut open the oil filter - I guess I can do that next)
Changed the water pump - it's new. Changed the fresh water pump - -
It almost sounds like it's coming from the crank pully/harmonic balancer
Other than the noise - the engine runs well - good oil pressure - runs at temperature.
The Manifolds and Risers have been recently changed -
https://www.youtube.com/watch?v=ufS3BQ5w14Q
Any ideas?