I believe I may be able to shed some light on this one. The stern lockers I believe you are talking about are the ones where the steering
arms are housed, and on inboard powered catalacs it is also where the fuel tanks
are located. These lockers are a bad design in both the 8m and the 9m, and are expected to fill with water! The main problem I found was inflow where the steering arm that connects the two rudders enters these lockers. I added an additional rubber gasket
to help seal the hole. My 9m also had an outboard, and this was originally attached to the steering arm in order for the engine to steer with the rudders. I discovered that the method of connecting had added a couple of holes into these lockers even lower than the steering arm, and was the main place that water was entering (I had already sealed the hole at the base of the locker which allowed it to be free-flow of water) The biggest problem if you seal this hole at the base of the lockers and do not do anything to stop water coming in, the locker tops up with water. Whilst that only will fill that locker in the starboard hull
, the port hull
is a different matter. The steering cable needs holes through, and when the port locker is about 2/3 full, it will start to fill up the port engine room. (speaking from experience before I started discovering all the holes and filling them up!) I ended up with a couple of little automatic bilge
pumps in the locker, but was not getting a lot of water in there anyway - nearly as much when it rained as when motoring in bad weather
I had a much bigger engine, and due to problems in space for the installation
, had not been able to get a decent forward rake on the engine, thus the stern squatted horribly (hence sealing the lower hioles)
You may be able to help solve your problem by:
getting a bit more forward rake on the engine
checking there is no lower hole for water to ingress
adding a better sealing flap over the hole for the steering connector
sealing the hole at the bottom of the locker
adding an automatic bile pump.
Bye the way
The floor of that stern locker is a false floor, sometimes not well sealed, and sometimes full of water underneath it. Its worth checking this out when you haul next.
Rick knows more about the 8m than I do, but I owned a 9m for 21 years, and knew both Tom and Mary Lack. I am always happy to assist on Catalac questions.