Diesel engine underload

Diesel engine underload

We’ll be running our main engine at fairly low load for several weeks while we cross the Indian Ocean. Since this likely is below the manufacturer’s recommended range, we’ve been asked if we’re concerned about ...

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Engine room cooling

Engine room cooling

Excess engine room temperatures are hard on the equipment and tough on the people. Engine room checks end up less detailed and, if you need to do emergency service, it can become a safety problem. We are all sufficiently motivated to want lower ...

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Maintenance log

Maintenance log

On our previous boat, we were (just barely) able to remember when all mechanical systems needed service as the hours mounted and time passed. But that system broke down when we got the current boat. There are far more systems, many of the ...

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A more flexible power system for Dirona

A little over a year ago, we worked our way south from Fanning Island, Kiribati towards Nuku Hiva in the Marquesas Islands. We were on a long, fuel-constrained run where we would cover 2,600 nm without fueling. For most of the trip, we were ...

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A helping crane

Our next-door neighbors, Mark Mohler and Christine Guo of Nordhavn 62 Gray Matter, recently upgraded their davit to support hydraulic power-rotation. The base came off in two pieces, but is much easier to put back together at the shop. The ...

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Lubricating the bow roller

After frequent anchoring, the bow roller bolts eventually would begin to jam and not turn easily. The anchor then would not freely deploy when released, and this also was causing wear on the stainless cheek plates on either side of the roller. ...

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Dirona Fuel Manifold

Nordhavn delivers an unusually complete fuel manifold with far more flexibility than most production boats. In fact, the manifold is sufficiently complex that some new owners can find it difficult. More than once, I’ve heard of an owner ...

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Battery thermal runaway

One of our eight Lifeline AGM GPL-8DL batteries recently went into thermal runaway, and we’ve had a few questions on the nature of the problem and why we chose to replace the full house battery bank. The lazarette smoke/CO alarm had gone ...

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Replacing the main steering ram

Steering is a great area to be picky about in overall mechanical system health. About three months back, we noticed a tiny amount of play at the spherical bearing that forms part of the rod end where the steering cylinder connects to the rudder. ...

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Fuel for the crossing

Dirona carries 1735 gallons of diesel for the main engine: 835 gallons in each side tank and 65 gallons in the day tank. (We also have a 10-gallon supply tank for the auxiliary engine). Although 1735 gallons would have been fine for the roughly ...

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Wing engine hydrolock (under “Failures” in presentation Q&A)

Wing engine hydrolock (under “Failures” in presentation Q&A)

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John Deere 6068AFM75

Last Friday I visited the engine for our new boat (next boat). It’s a John Deere 6068AFM75 M2. The standard engine in the Nordhavn 47 and 52 series is a Lugger L1066T.2 with a ZF220A gearbox. Both are great, long lasting components. We chose to ...

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Bayliner 4087 Fuel Consumption?

A recent question on Bayliner 4087 fuel consumption: We are currently in negotiations to purchase a Bayliner 4087, 2001 model with 330 Cummins Engines.  Can you set my expectations for fuel burn? Second question, we have just sold our Grand ...

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Are Synthetic Oils Worth It?

Some time back I came across a  query on whether synthetic oil could be safely used in marine diesels. My response:   Most manufacturers permit the use of synthetics, but don’t allow longer oil change intervals when employing ...

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One hour in 10 at Wide Open Throttle?

Some time back I got a question from an owner of a larger Bayliner concerned that he wasn’t running his engines hard enough and that, as a consequence, they may not last as long. The advice he’d been given was that diesel engines need to run ...

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Transom Diesel Soot

I recently had a question on how to eliminate diesel-engine sooting at the transom.  It’s an interesting topic because almost everyone is convinced they have a solution. These solutions run from expensive diesel fuel additives to passing ...

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