(I have used Kent marine services (kevin) from Rochester before for the engine)

Are there any experts based at MDL Chatham?

My 1988 era Yanmar 2GM20 has had a weird noise since i got the boat at the end of 2017. IT sounds like loose change rattling. Engine has new Poly Flex mounts, had tappets checked. Starts up fine. But the noise is disconcerning