I have a Yanmar 4JH2DTE in my boat and I don’t seem to be getting the power I am used to above 2,400 rpm. I checked the fuel filters and they seem OK. What else should I check?Schedule

I’d like to start using an iPad as a backup navigation option. I am not sure what navigation application to use and I am a little confused about the GPS options for the tablet. What’s the best way to go?Schedule

 We’ve used an Argonaut T-Flex marine monitor on our boat for more than 15 years. It worked great because it allowed us to keep the laptop running the navigation software safely in the nav desk and it operated with a wireless mouse. We could see it even with sun glare and we never had to worry about power spikes or water damage if a wave came down the companionway. Unfortunately it finally gave up and we’ve been told it’s beyond repair. 

 My Tayana 48 came with wire and rope halyards and as part of my refitting efforts I replaced them with high-quality Dyneema double braid last summer. After wintering in the Caribbean on the boat and bringing the boat back this spring, I found that the cover on a couple halyards and the topping lift has worn through. I bought what I thought was good cordage, so why did this happen? I also broke the block on the mainsheet. It was an older block, but appears to have been made of plastic with metal strapping. I’d like to replace it with an all-metal block so I don’t risk breaking it again, but I’m not sure what kind I should look for.

 I’m the kind of person who likes to know how things work and a few systems on my boat have me stymied. A few years ago I installed a Frigoboat keel-cooled refrigerator. It works great, but I am trying to figure how many times per day it runs and for how long. It’s so quiet that I can hardly tell when it is running. 

 I am adding an AIS transceiver to my boat. After a few close calls, I decided that not only do I want to know where other boats are, I’d like them to be able to see me as well. It looks like the AIS will work well with my chartplotter but I don’t know what I’m supposed to be doing with the antenna. I’d appreciate your guidance.

Dear Boat Doctor, I am installing some new Harken winches on my boat, and I was told to clean the fasteners and use Loctite to prevent them from “galling.” I agreed, but I’m not entirely sure I

 I just bought a used Catalina 36 MkII. I’m thrilled with the boat but I have an issue that came up during the survey that I’d like to resolve. The tachometer appears to read high. The boat idles at the proper speed, but the tachometer reads more than 1,000 rpm. A similar problem occurs at cruising speed as well. I discussed it with the surveyor and he suggested it was related to the alternator. What’s the issue here and how do I fix it?

I would like to install a battery monitor that will show the state of the charge of my batteries. I have basic mechanical and electrical skills and would like to try to install it myself. What’s the best way of doing it?

I am going offshore this winter and the skipper said I need a specific inflatable life jacket, one with crotch straps and a spray hood. The problem is that I’m finding it hard to find one that incorporates both of these. Any suggestions?

 I recently had a scary experience on my boat when my PSS dripless prop shaft seal began to leak in a rather dramatic fashion.  The water rose above the floorboards. I was able to get it under control and later consulted with the boatyard, determining that the shaft collar was not correctly installed. The stainless ring on the prop shaft slipped and allowed water to enter the boat.

Dear Boat Doctor, There are some deep gouges in the bottom of my boat that I need to fill when I pull the boat out. I have used epoxy in the past, but it was a pain to thicken and to

My Jeanneau Sun Odyssey 40 came with running rigging lines that all seemed needlessly long. The extra line adds to the difficulty of housekeeping, and in rough going sometimes creates a mess under foot that creates what I would call a hazard.  After a few years, I cut all lines to their longest useful length.I have two friends with similar-sized boats, and they have many feet of extra line that ends up piled on the cabintop. They are resistant, saying “You never know when you will need it,” or “The rigger left it for a reason.”  How do you see it?

Dear Boat Doctor, I need to replace the batteries in my house bank. They are about 6 years old and just don’t seem to hold a charge as long as they used to. But how do I know what type to buy? 

Dear Boat Doctor, I sometimes get a little lazy when sailing my Catalina 36 and just use the roller furling genoa. I endure a bit of ribbing on the dock for this, but I’ve also been told that I’

Dear Boat Doctor, I installed a new engine in my boat a few years back, but the control panel often stops working. I suspect this has more to do with the amount of water in the cockpit than the cont

 I just bought a new-to-me Baba 40. I love the boat and have spent lots of time cleaning it up and just making it mine. It came with a nice Bruce anchor, one of the original well-built ones. I really like the anchor but it could look better, it’s pretty rusty. Can I have it galvanized or can I paint it?

Dear Boat Doctor, The teak decks on my boat are failing. I love them but they are washboarded and thin enough in places that the caulking is just falling out. I need to do something about them but I am not quite sure what. What are my options?