Posts Tagged “Mechanical”

Crane Maintenance

Crane Maintenance

In Newport we found a washer on deck below the crane and concluded we likely had a critical crane issue, so stopped using it until we understood the problem. We later found a bolt on deck as we arrived into Baltimore. It was pretty clear that something was coming apart in the crane. James took…

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Replacing Engine Mounts: Take Two

Replacing Engine Mounts: Take Two

As we completed our previous attempt at changing the engine mounts, we still had two major issues. The first was the front mount material seemed thicker than what originally was on the boat, and the second issue was we couldn’t jack the engine up far enough to remove the old rear mounts. We spoke with the…

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Replacing Engine Mounts: Take One

Replacing Engine Mounts: Take One

In Boston we noticed that our forward engine mounts were starting to deteriorate. We purchased replacements but expected the current ones to last for months yet. While in Newfoundland, they suddenly started deteriorating badly and over two weeks the isolation material just crumbled away in a pile around the mount. One morning we picked up…

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Boston Tour Boat Crash

Boston Tour Boat Crash

When there’s no room for error, even a small mechanical failure can make for a very bad day. In this case, one of the four main engines on Boston Harbor Cruises’ Regency remained in forward gear coming into Long Wharf and, with only seconds to figure out what was wrong and take action, time ran…

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Oil Analysis

Oil Analysis

Oil analysis is one of these practices where many people I know find it valuable and send their oil out for analysis on every oil change. We don’t on Dirona not because we don’t believe in it but more from a perspective that the hassle/cost-to-value equation isn’t sufficiently compelling for our usage. When I raced…

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Crankcase Pressure

Crankcase Pressure

Our main engine now has more than 8,000 hours, so increased oil leaks are more or less expected. But up until recently it has leaked almost nothing and the change to leaking more happened quite quickly, so we decided to dig deeper. Oil seepage can be caused by loosening bolts, tired/old gaskets and seals, and…

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Nordhavn 47/52 Rudder Upper Bearing

Nordhavn 47/52 Rudder Upper Bearing

Boats are full of compromises, and advances in one dimension can bring problems in another. Nailing the full equation of longevity, strength, and serviceability often is truly challenging. A perfect example of this challenge is the Nordhavn 47 and 52 rudder upper bearings. The early members of the Nordhavn 47/52 line used fixed race ball…

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Cracker Boy Boat Works

Cracker Boy Boat Works

When we hauled out in Whangarie, New Zealand near the end of 2013, we didn’t expect to go more than 2.5 years before the next haulout. We finally lifted Dirona again at Cracker Boy Boat Works in West Palm Beach. In the nine days that followed, we cleaned and painted the bottom; re-applied Propspeed to…

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Balancing alternator outputs

Balancing alternator outputs

In our charging configuration, we parallel the house and start alternators to charge the house battery bank. Each alternator has its own individual Balmar Max Charge MC-624 regulator and we’ve been asked a few times if we balance the outputs using a product such as the Balmar Centerfielder.  This is one of those issues where…

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Fuel bugs

Fuel bugs

As we describe in Dirona fuel manifold, we choose to explicitly pump fuel from the appropriate bulk tank to the supply tank rather than gravity feed. This is a slightly more manual operating mode but has some advantages that we really like. The first advantage is that a leak in the supply system can put…

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Hot Rodding the Mastervolt Inverter

Hot Rodding the Mastervolt Inverter

Our Mastervolt MassCombi 24/4000-100 120V inverter works well and we generally like it but it has always seemed to go into thermal shutdown earlier than it should. The inverter is particularly vulnerable to thermal cut out when it’s more than 80F outside and the sun is shinning directly on the stern. The early thermal cutout…

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Changing the Hydraulic Actuator

Changing the Hydraulic Actuator

Stabilizers are used on ocean-going vessels to remove the discomfort of ocean swell. Generically they come in two broad forms, passive and active. Passive stabilizers are the metal fins that you might have seen hanging from outriggers on fishing trawlers. And, if you saw the movie The Perfect Storm, that was a passive stabilizer that…

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Oil Change at Sea

Oil Change at Sea

Earlier this week, we brought the boat up on the wing engine and shut down the main engine to change the oil. Normally we’d never do this, even though the chance of a problem is small, because in the unlikely event that a problem does occur, it would be a very big problem. (See To…

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To Change or Not to Change? That is the Question.

To Change or Not to Change? That is the Question.

Oil changes at sea get pretty close to a universal response from boaters I know. Everyone says loudly “DON’T DO IT.”  The risk of something going wrong when hundreds, if not a thousand miles, from shore is simply too high. And, with oil change intervals ranging between 250 and 375 hours, there typically is no…

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