Maintenance day
There’s been a lot going on, plenty of travel and interesting sights to report. But this post is strictly maintenance-related. We are anchored in a quiet little creek just up from the mouth of the Potomac River. In the coming days we will head to Washington, DC to visit Simon and Hannah. But for today and possibly tomorrow we are sticking here. There is a front moving through and it’s bringing big winds and rain.
We are anchored in 10’, the bottom is muddy, the tide is minimal, the protection from wind and waves is perfect. It is an excellent spot to wait out weather.
I woke up at 5:30am today and realized that the beautiful 80 degree day we enjoyed yesterday turned to a wet and windy 48 degree morning. And I left the pilothouse hatch open a bit last night. No harm done, but quite a rookie mistake.
So today I got to some glamorous tasks: oiling the teak, cleaning the windows, and fussing with a ball valve. Ellen has been doing some painting and building on a project we are surprising the newlyweds with, so don’t mention anything to them.
Yesterday I was calculating how much longer we can expect the raw water impeller to keep impelling the raw water. There’s no way of knowing, but when I looked at it in August it seemed fine. But it is nevertheless overdue for replacement. When/if it fails we will be without an engine until it is replaced, so there’s a non-zero chance of catastrophe.
The raw water impeller is the piece of equipment responsible for pumping cool ocean water through the engine so it doesn’t overheat. Boats don’t use radiators to cool their engines like cars do, instead they pump in water and use that to cool things down. The impeller is the heart of the pump and because it is made of rubber, it is a wear item.
Ok, so I’ve been calling it a tool like it is some complicated piece of equipment, but the removal tool is just that big bolt that gets screwed into the end of the impeller, pushing it out of the water pump housing.
The August inspection was ostensibly an attempt to replace the impeller with a new one, but I was stymied because I didn’t have an impeller removal tool. I ordered one of them and although it is on board, along with several spare impellers, I have been putting the job off for months. I’ve probably replaced 15 boat impellers over the years, it’s not a difficult job until it is. And if it goes poorly, the engine can’t run until the task is done right. This water pump is in a pretty tight spot that doesn’t fill me with delight or optimism about the task.
How to replace an impeller: close the ball valve, remove the four bolts holding on the water pump cover plate, use the tool to remove the impeller, install the new impeller, replace the cover plate, open the ball valve, hope nothing leaks. What could go wrong?
Another reason I’ve been putting the job off is that the ball valve doesn’t shut completely. The ball valve stops water from coming in and sinking the boat while I have the water pump apart to remove the impeller. The valve is 21 years old and reluctant to close fully unless I whack it with a rubber mallet, even after a good malleting a trickle of water still makes its way in. The trickle isn’t a problem, but it creates a salty mess under the engine and is irksome to the person fussing with the impeller.
That’s the ball valve at the bottom left. The big tank-looking thing is the sea strainer. It keeps fish and seaweed and whatever else gets pulled in from making its way to the engine. The truly remarkable thing about this setup is that, unlike the water pump, everything is easily accessible.
To replace the ball valve (I ordered a replacement, it is inbound to Simon and Hanna’s place in DC) the boat needs to be hauled out of the water. Removing the valve while in the water would leave a 2” hole in the bottom of the boat. The internet has ideas about how to change a valve while in the water, they involve a swimmer going under the boat with a plunger that gets suctioned over the hole, then the valve gets unscrewed and replaced, and the plunger gets removed. Sounds doable, sounds like a fun challenge, but definitely not something for this murky Potomac water so I’ll wait until Florida at the earliest.
For the meantime I will exercise the valve. (That just means I will open and close it repeatedly in the hopes it becomes more compliant.) And I’ll probably wait until we are anchored in DC before I mess with the impeller. It should be pretty easy to remove using the new tool, but I’m not sure how easily I will be able to install the new impeller.
