Posts Tagged “Mechanical”

Exhaust Cooling Fault

Exhaust Cooling Fault

The dry exhaust system on Dirona is well-built and reliable. The way it works is the stack heads up through the boat in a 5-inch pipe to release exhaust gas at the top of the stack. The exhaust pipe is enclosed in a larger pipe where it passes through the boat. This larger pipe provides…

Read more »

Southampton

Southampton

Prior to the thirty-one days in Southampton, the longest time we’d ever been in the yard was ten days. During our month-long Southampton yard trip we completed three major projects: replacing the muffler, rebuilding the crane, and replacing the cutlass bearings on the rudder shaft and the wing and main propeller shafts. We also completed…

Read more »

Cutlass Bearing Replacements

Cutlass Bearing Replacements

The final major project we completed at Saxon Wharf in Southampton was replacing the cutlass bearings on the rudder shaft and the wing and main propeller shafts. On inspection after removing the cutlass bearing, our main propeller shaft was badly corroded with some of the pits running quite deep, so we opted to replace it…

Read more »

Crane Rebuild/Remanufacture

Crane Rebuild/Remanufacture

A second major project that we completed while in the yard at Southampton was to rebuild our crane. It was in remarkably poor condition. The ram-to-extension bolts were siezed due to lack of Tuff-Gel application on the stainless screws in the aluminum casting; the linear winch had worn away all its bearing material, damaging the…

Read more »

On the Hard at Saxon Wharf

On the Hard at Saxon Wharf

Boats have been damaged or destroyed during lift operations, so we’re always nervous whenever we haul Dirona out. We were impressed with the care Saxon Wharf took in the lift, including asking for exterior hull photos to could assess where to place the lifting straps. The operation went smoothly and by mid-morning we were safely…

Read more »

Engine Work for Christmas

Engine Work for Christmas

We had an intermittent engine control unit fault code on Dirona‘s John Deere 6068AFM75 that started shortly after we departed Kinsale, Ireland. Under higher loads or at idle when running the hydraulics, we sometimes get a 1347.7 fault code which indicates the actual fuel rail pressure is different from the called-for pressure. This occurs is…

Read more »

Racor CCV

Racor CCV

I’ve never been happy with the RACOR CCV (Closed Crankcase Ventilation) system on our Deere engine so I decided to dig in and learn more. To meet emission requirements, the CCV (the black housing circled above) separates oil from the crankcase vapors, drains the oil back to the sump and sends the vapors back to…

Read more »

Diesel Engine Load Profile

Diesel Engine Load Profile

Electronic diesel engines track usage data to help engine manufacturers and service personal understand causes of different fault conditions and evaluate how well the engine is performing in that specific application. Generally this data isn’t available to end users but, if a service technician is on your boat, it’s worth asking for the engine load…

Read more »

Two Generators When You Only Have One

Two Generators When You Only Have One

The best way to have two generators is to actually install two generators. But two generators would be a tight fit in our engine room. Milt Baker proved on Nordhavn 4732 Bluewater that, with skill and forward thinking, you actually can fit two generators into a Nordhavn 47 or 52. It is a rare configuration. Most,…

Read more »

Managing Fuel Quality

Managing Fuel Quality

When we left Seattle on our trip around the world, we were expecting fuel quality issues to be common and carried 48 Racor 900 fuel filters. Surprisingly, we used less than ten on the entire trip. Most of the fuel we got world-wide was surprisingly good. We did encounter some minor fuel quality issues, but…

Read more »

A More Flexible Power System for Panacea

A More Flexible Power System for Panacea

In 2014 we published A More Flexible Power System for Dirona. This article ran in the April 2016 PassageMaker issue and aspects of this design have been offered as options on new Nordhavn builds. Since that article was published there has been considerable progress in lithium-ion battery technologies. All forms of Li-Ion battery technology offer…

Read more »

Steering Issue

Steering Issue

We haven’t had steering issues in the past. Given they can happen anywhere, why the heck would it occur within hours of dead-center on our 2,800 nm trip through the North Atlantic? We have covered a lot of miles over the years and generally have seen pretty good conditions. The weather we’ve encountered has been…

Read more »

Alarms at 1:15am

Alarms at 1:15am

I bolted awake at 1:15am to a shrieking alarm. We were 50 miles south of the Grand Banks, in large seas, on passage from Newport, RI to Kinsale, Ireland. I ran upstairs to the pilot house and Jennifer, at the helm, just said “high bilge water.” Yuck. Better than fire but far from good news….

Read more »

Big System Coming

Big System Coming

For quite some time now we have been watching a very large low in the weather models coming down from Greenland. The storm is currently predicted to bring 20′ waves on 10 second period, with 25 to 30 kt winds.  With 20′ waves nominal, there will be some that approach or exceed our 30′ mast…

Read more »

Fuel, Option Value, Speed, & Safety

Fuel, Option Value, Speed, & Safety

Boat range in ocean conditions is remarkably hard to predict but it’s just about guaranteed that your real range is far shorter than estimates or even careful measurement if it wasn’t done in real ocean conditions. Ocean swell slows boats remarkably. We had no idea how much impact this would have when we first got…

Read more »

Nothing Runs Like a Deere

Nothing Runs Like a Deere

Most John Deere engines are scheduled to have the vibration damper replaced at 5 years or 4,500 hours. However, our Deere 6068AFM75 uses a viscous coupling with an 8,000-hour replacement interval so we went nearly 7 years before needing to make a change. We crossed 8,000 hours as we headed into Boston early last year,…

Read more »