2015 Moomba Mojo Winterization Help
Good morning group!
I recently purchased a used 2015 Moomba mojo and unfortunately the winter months in Michigan are rapidly approaching. I have been doing a lot of research in the forums about winterization of these boats with the raptor 400 engines and have found that there are a lot of discrepancies around this year and model boat on where the raw water drain points should be. I was hoping this group could help me feel better that I drained all the areas I needed to.
1.) To start I pulled the sacrificial anode plug for the V drive
2.) I removed the heat exchanged sacrificial anode bolt
3.) Here's where it got interesting..... there was a picture of a raptor motor removed in a prior post that showed the drain spots with blue stickers / blue wing nut plugs. My boat had neither of these. It showed a plug for the impeller pump hose which my boat just has the hose. I removed the hose from the impeller housing to drain the water....which wasn't very fun
4.) I removed the cover to the impeller housing to drain what little water was still left.
5.) Another discrepancy I discovered was in the exhaust manifolds. I read to remove a brass plug in each manifold to drain the water. My boat appears to have both my manifolds tied together with rubber hoses that meet at a T fitting that then drains out the bottom of the boat. I'm assuming these are self draining manifolds? Does any one else have this or was this an addition from the previous owner?
This was all I drained for the engine. I then drained all the ballast pumps until no water was coming out. I plan to then disconnect the hoses and run some RV anti freeze through them until I see it come out the drains. What should I do for the hard tank in the center? I just turned the pump on again until no water was seen draining from the boat. Is that good enough?
Lastly I pulled the two hull drain plugs. One on the transom and the other from the center access point.
Have I missed anything else? The boats going to be stored in a garage that's unheated so its going to be protected from the elements but its still going to be exposed to freezing temps the winter.
Thanks again in advance for the help! I'm new to inboard boats and want to ensure that my new to me toy will be safe till the spring.
Jon
2015 Moomba Mojo Winterization Help
Ballast pumps typically are mounted high and a self draining orientation.
Ballast does not need anti freeze as long as you got the majority of water out. Plenty of room for expansion.
Raptors are goofy/inconsistent year to year on blue drain plug qty and locations. Check the correct 2015MY Indmar manual. My 2021 raptor only had 3 blue plugs and my 2018 had 4.
The impeller housing also self drains, but I think they assume it’s a good time to replace impeller anyways.
Each time I have replaced impeller there was no water in the housing.
The exhaust manifolds have a rubber crossover hose with a brass connector around the transmission area, disconnecting this will drain them, I leave it open until spring.
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