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View the latest post Attachment(s) Volvo Penta 740 Big Block - noise and a knock


I have a 1990 Santego 2767. The motor is a Volvo Penta 740 Big Block (pic attached).
Anyway, we were having fuel issues for a month or so (stalling, etc.) and so after changing the fuel filter a couple of times, we decided to drain the tanks of dirty gas with black bits floating around, and fill them with fresh fuel.
With our new, clean gas, the boat was running better than ever. A lot less smoke, quiet (smoother), etc. Then, last week we went out and it was again going great, when suddenly it got loud (like a muffler blowing off on a car). It might have lost a little power (hard to tell) and I think I can hear a bit of a knock.
I thought a hole might have developed in the exhaust somewhere, but I can’t see it.
Any suggestions would be appreciated!

volvo penta 740.jpeg

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