Patrick123
Cadet
- Joined
- May 11, 2003
- Messages
- 27
I bought a boat a while back, almost ready to take it out. It is a 1977 Fiberform with a 350 and a recently rebuilt Mercruiser drive (please forgive my ignorance for not remembering the model #.) Anyway I am pretty new to I/O boats but I like to think I know my SB Chevs. The engine sounds like it's knocking when it is running in my driveway with the garden hose hooked up. It sounds like a cold diesel. Except for the knock the engine sounds and seems to run great (at least in my driveway) and oil pressure is strong. I have gone all over the engine with a mechanic's stethescope while it's running and it doesn't really seem to be a rod like I would suspect. I bought the boat not running (wiring issues) but was told the engine was good. Is there any chance that a knocking noise is normal? I don't really know what sounds to expect with the engine bolted rigidly to the hull of a boat sitting on a trailer, I'm pretty new to this. If it isn't normal where should I start in my tracking of the noise? The drive supposedly was rebuilt recently. When I got the boat, the outdrive was off and the u-joints and bellows and stuff all look brand new, so I believe it. Thanks in advance for your help.