The weather guys got it right again today. 15 to 20 knots from the North West all day. The forecast for tomorrow is North East, 5 to 10 knots. This would be perfect for us to cross the bay to Solomons to visit our Pilgrim friends Bill and Judy and their Pilgrim Dreamboat Annie. We thought we would for sure miss them on our trip south this year as they were working out of town this week and we thought we would be passing their location last Monday. Obviously we didn’t pass them early this week so the visit might work out after all.
We finished up the laundry this morning and the skipper spliced together some Raymarine cables that allowed us to properly mount our data/backbone cables so they weren’t dangling out in space (really dangling loose in the navigation electrical cabinet). After our “leftover” lunch (soup and hot dogs) we defrosted the refrigerator and then thought we would do the simple task of replacing the zinc anode on the engine’s heat exchanger.
This is an anode. In simple terms the zinc wastes away keeping salt water from eating the inside of the heat exchanger.
When we got the engine we pulled the new zinc and it appeared to be a standard 1/4″ NPT anode. Since we had a large box of these left over from our old engine we thought we were all set. Our old ones were too long, but a hack saw took care of that issue.
Changing the anode today turned into a project. How, you might ask? Well it is a boat part. We took the old one out (wasted to less than 50% after one month in salt water), and tried to thread in the new one. It only went in about two threads before getting tight. Something just isn’t right here. We measured the old and new one and found the new one being .010 larger in diameter. The number of threads lined up but running the engine showed lots of leakage around the threads. You need metal to metal to metal contact so using any Teflon tape would isolate the metals rendering the anode useless.
We called Beta Marine and found that the thread was actually a British Standard Pipe Thread (BSPT) and not National Pipe Thread (NPT). Inquiring minds want to know the difference. The angle between treads on BSPT is 55 degrees, NPT is 60 degrees. Not much difference, but enough to cause the threads not to seal if mis-matched.
Generally you can un-tread the zinc pencil part from the brass holder and thread in a new zinc. Beta Marine sells such a part. However, the one that comes with the engine is a one piece unit, so you can not replace just the zinc part. Thank you very much. We ended up putting the original one back in the engine and will order three of the replaceable ones from Beta Marine so we always have a replacement ready to go.
While we were discussing zincs on the phone we mentioned how we switched the alternator output to our house bank from the start bank. Beta Marine said this was OK but it is important to feed the control panels with that same voltage. Simply remove the brown/white wire from the + post on the engine and jumper it to the alternator output. That seemed simple enough until we found two brown/white wires, where the circuit diagram only shows one, going to a singular 40 amp fuse. Another phone call and we find we have two wires (and fuses) because we have two engine control panels. We made up some jumpers, re-routed the wires and ran the engine. Everything is working like it should and now we see house bank voltage on the instrument panel rather than start bank voltage. There went the entire afternoon, boat projects eat time like it is going out of style. It is a good thing it is fun.
Tonight’s sunset.
We having been lunch and dinner with LNVT Dave every day since Bicki has been gone (and with Bicki while she was here) and today was no exception. Dinner was on Liberty and consisted of left over spaghetti, clams, salmon, Caesar salad bread and wine. Before dinner we sampled cheese, pepperoni, and crackers. Desert was strawberry shortcake. This cruising thing is really hard on the waist line.
Tomorrow we cast off the dock lines (actually we take them aboard) and head for Solomons, 34 nm away. Hopefully.
Dave