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I recently started hearing a "knocking" sound when my port engine is in reverse. When it's in forward there is no knocking and the transmission is shifting normal. Just that knock in reverse - any ideas what that can be? I checked transmission fluid levels and all seems normal.

Great, thanks to all for your advice. I hope to tackle this in April once it warms up a bit!

Anyone ever change the heat exchanges - just wondering if this is a DIY type of job? They seem accessible and I prefer to do whatever maintenance I can on my own, but don't want to get in over my head. I have a 2005 with 8.1 engines and v-drives.

The shower sump pump drain hose (from sump pump out to side of boat) runs behind the cabinet in the aft cabin where the vacuum is stored. I know that because I had a similar problem with wet carpet in the aft and it was because the drain hose developed a crack from friction where it was rubbing...

I replaced my four batteries with Autocraft Group 31s in 2013 and still going strong, but will probably replace this season as a precaution since going on 5 yrs. They're a bargain at Advance Auto for a little over $100 each last time I checked.

Brand new I've seen them about $2k; I've also seen some used ones on ebay but would be leery...

Hi I have a 2005 with the same issue that started last season. I believe it's the ECM (computer module). It started in my starboard engine, but would only happen one time soon after ignition (wouldn't have to restart engine, but it would beep and lose gauges for two seconds). My mechanic was...

"Lost Communication" alarm...A few times over recent weeks a single alarm went off (one beep, then stops) that communication was lost to the stbd engine. It only happened at idle speed. One time the engine remained running and all gauges read fine. Another time the gauges (in dash and on...

Had same problem last year and it was driving me crazy. Ended up having my mechanic check the fuel pressure in each engine; supposed to be 40 and my port engine was at 70, which explained the higher fuel burn rate. Problem turned out to be the fuel pressure regulator in the cool fuel unit.

Re: 2003.5-2008 340 Sundacer Thread 11' 6" - those are the dimensions direct from the owner's manual (section 2.5)

Re: 2003.5-2008 340 Sundacer Thread 11' 6" - those are the dimensions direct from the owner's manual (section 2.5)

I track the GPH fuel burn for each engine at every fill up. Over the past several years (>200 hrs) my total average is 17 GPH (~8.5/engine) across a wide range of destinations and cruising speeds.

I had my mechanic check the fuel pressure in each engine; supposed to be 40 and my port engine was at 70, which explained the higher fuel burn rate. Problem turned out to be the fuel pressure regulator in the cool fuel unit.

Advance Auto parts sells Group 31 marine batteries for about half the price what any marine store or marina will charge. I replaced my four batteries with them almost three seasons ago and still going strong.

Thanks for the suggestion, wasn't due for a tune-up yet but you never know. I do have smartcraft, but even on former twin-engine boats I manually tracked fuel-burn per engine to monitor performance.

My port engine is burning 2-3 gph more fuel than my starboard engine. RPM's are good, strainers are clear, seawater pumps are new and the genny pulls from the starboard engine. I track my gph closely and past seasons both engines have been in sync in terms of fuel burn rate. Any ideas on the...

I'd send it back to Raymarine; same thing happened to my slip neighbor and that's what he's doing. I have the same unit, it shouldn't just crap out.

That's a good idea, especially as us boaters in the northeast are about to get pounded with a historic blizzard later today. After attending the NYC boat show this past weekend, can't wait for boat season!!!

Because several years ago (~2009) the U.S. changed it's method of broadcasting tv signals over the air from analog to digital.

In addition to the above advice, if you still have the original tv's you may either need to install a digital converter or invest in new tv's with built-in digital receivers.