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Dominick
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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Have aboat with a350 merc engine just put new bellows in bellhousing

Customer Question

have aboat with a350 merc engine just put new bellows in bellhousing when completed hooked garden hose up started motor a lot water came out 2 1"holes at bottom of housing some water came out prop not to much when we shut down found new exhaust hose had come off inside
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.
Hello. My name is ***** ***** relief holes for when the boat is sitting still in the water. The exhaust and water will exit those holes to preven back pressure on the exhaust. So what are your concerns?
Customer: replied 1 year ago.
the amont of water coming out those holes compared to exhaust out prop was there to much pressure coming out exhaust bellows to blow off inside we used bellows cement and clamps was tight
Expert:  Tan replied 1 year ago.
No the engine wouldn't run if the pressure was high enough to blow off the bellows. Did you inspect the clamp areas where the bellows clamped? What is the model year of the engine?
Customer: replied 1 year ago.
the boat is 1988 with a merc 350 motor we put in earlier it is a 1997bought boat without a motor have had to do a lot of work on itfound complete motor runs good just seems like we have one issue after another im finding out what boat means bail out another thousand???
Expert:  Tan replied 1 year ago.
There is one possibility the exhaust shutters # ***** have fallen down into the exhaust of the drive creating back pressure. The bellows blowing off is what allowed the engine to keep running. http://www.boats.net/parts/search/Merc2/Mercruiser/350%20Mag%20Alpha%20-%20%28GM%20350CID%205.7L%20V8%29/0B525982%20THRU%200F600999%20%281987-1995%29/EXHAUST%20SYSTEM/parts.html Before you installed the engine did you check for the shutters? They can be lodged in the pipe #1 or stuck in the drive.

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