Loud Pipe-Like Banging Noise from Engine

pau

Recruit
Joined
Jul 15, 2009
Messages
2
I have an 88 Bayliner with a 5.7 liter and a cobra outdrive. Cruising at about 2500 rmp's the engine suddenlly stopped and a very horrible banging noise started. It sounded like pipes banging around in the rear of the engine compartment. I removed the outdrive from the boat and started the boat for 5 sec's and the noise was still there . Also when I looked into the hole in the outside of the boat where the outdrive mounts up, I saw something that looked like a washer that was shredded up. It wasn't the gimble bearing. It looked as if the it would have lined up with the universals by the spline shaft of the outdrive. Could somebody help me , somebody said It could be somekind of a coupler in the engine, and it doesn't sound like a rod , it's a different noise. Also, the day before I hit a log which I'm sure could have something to do with it. It 's making the noise in neutral and gets alot worse when u try to put it in gear, and it doesn't go in gear.
 

180shabah

Rear Admiral
Joined
Mar 26, 2005
Messages
4,995
Re: Loud Pipe-Like Banging Noise from Engine

If you removed the drive and the noise is still present, that just leaves the engine and the coupler. The engine will need to be removed for either one, soo.....
 

lowkee

Lieutenant Commander
Joined
Dec 13, 2008
Messages
1,890
Re: Loud Pipe-Like Banging Noise from Engine

Try removing the spark plugs and turning the engine over by hand. If you feel a spot where it gets hard to turn, look in the coupler section for binding.

At this point I would limit testing to not running the engine. At most, turn it over with the starter and no plugs.
 

pau

Recruit
Joined
Jul 15, 2009
Messages
2
Re: Loud Pipe-Like Banging Noise from Engine

Thanx guys.... Some people are telling me the coupler wouldn't make noise, it would just act like a slipping clutch in a car......IS THIS TRUE???????? I"m pulling the motor anyway thank you...PAUL
 

180shabah

Rear Admiral
Joined
Mar 26, 2005
Messages
4,995
Re: Loud Pipe-Like Banging Noise from Engine

That is the typicalfailure, but it is possible that yours is completely destroyed and is banging around back there.
 
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