Search results

Hi CountryBTr, I've got twin Yanmar 4LHA engines on my 1999 Mainship. They've got over 3500 seasonal, salt-water hours on them and I'm very impressed with how they've held up. I'm in the process now of changing all the original hoses on both the coolant and sea-water circuits right now because...

Yes. That's how I do it (oil filter, or anything on the outboard side of engine). To make things easier, I modified my raw water strainer arrangement to locate the strainers further forward and added quick connect fittings on the strainers. I felt that the quick connects were safe enough given...

This is something I've been thinking a lot about. I too have the -STE engines. Mine have over 3000 hours and run great. I've done the Barnacle Buster but still wake up at night worrying about salt-water intrusion to the engines via the intercooler. I'd really like to have a look-see in there and...

So is a small amount of steam a problem? From my Yanmar 4LHA-STE's, I get a small amount of white steam from both. It dissapates/evaporates within a few feet of the exhaust exit. There's no persistent smoke and the engines sound great and jacket and exhaust temps are good. -Adam

The Mainship 350/390 that I own is one that comes in both flavors. When I started shopping for this model, I was looking at the singles and ended up buying the twin because "the perfect boat" fell into my lap. I would say that I wish I bought the single, but I'm glad I own the twin :rolleyes...

That looks like runout to me. Speed is too low for it to be vibration I would say. Seems you either have a bent/bowed shaft or an eccentric connection to the transmission. I would measure runout at different stations along the shaft fore to aft using a dial indicator. Runout at the transmission...

Roger that. Raising RPM a little does seem to help but I always wonder if that does more harm than good. This is my 3rd season with the boat and both engines seem to be running smooth and strong at about the 3000 hour mark. The PO (original) claims that he's observed similar behavior on both...

Thanks Gents. I would tend to agree that it should not be needed. I don't think I'm paranoid. However, my Port engine takes "forever" to generate oil pressure. I'll post a video to show you what I mean. I don't know how it's possible, but sometimes I have to wait 45-60 seconds with the oil...

Greetings All, Has anyone engineered a pre-oiler system onto their Yanmar 4LH or similar engine? If so, I'd love to hear the details. I suppose this would also be a good time to invite comments on pros and cons of pre-oiler systems in general. Does anyone think they are not beneficial or more...

Alignment You can set up a wood v-block to hold up the prop shaft end. Find the up/down/port/stbd position that allows the easiest rotation and least binding. This will position the prop shaft about where you want with respect to aft running gear. A few thousandths one way or other won't...

Slocum was a naturalized Yankee and proud of it! Says so in the first few pages of his wonderful book. A Canadian? Please! -Adam

Wise Now that is what I call a wise choice!

Wow! What a resource! Bacchus, where do you find the time? -Adam

Brilliant Comodave! Exactly the kind of tip I can use.

Greetings, I own a 1999 350 Trawler. This photo from the 390 owners manual I downloaded from this site (thanks!) accurately depicts what I have on my boat. Can anyone here specifically identify the manufacturer of these rudder components? Is that important to know before repacking? I don't see...

That is a common misconception. There are several different types of nuclear reactions that can be used to produce power. They vary in the number of and type of by-products that are produced. Historically, thermal neutron reactors were used for most power production because of the success this...

I don't fear climate change, I fear the government's response to it. There are a great many dumb ideas flying around that, if implemented, will do nothing to reduce CO2 emissions while doing great economic damage. Economic damage that harms people as much, if not more, than climate change. That...

Difficult access to outboard sides of the main engines. There's only about 10" between the motors and the fuel tanks and one can't go over the top and down the side because the sole hatches aren't wide enough. In short, everything on the outboard side must be done with one hand and on the...

Jackpot! Thanks to all that contributed here. I just downloaded the manual for the Mainship 390. Excellent resource!:dance::dance:

Greetings all. Been watching for Mainship 350/390 in the online marketplace and am seriously thinking of taking the plunge. Haven't really browsed this site yet but I'll be looking for local resources (Sandy Hook, NJ) that will help me evaluate candidate boats. Would love to find members...