altGetting the owner of an older sailboat to spend the money on a brand new diesel auxiliary is a challenge for many marine service businesses. Often the costs involved in the purchase and installation of a new powerplant carries a bill that can make most recreational boaters blush and run away. Some vessels, however, are built for the long haul and replacing the diesel engine on an otherwise sound mechanical vessel can extend the life of the boat at a fraction of the cost of the replacement of the entire boat. Newer marine diesels are also more fuel efficient, smoother, quieter, lighter, and pack far more horsepower into smaller packages.

A boat designed for offshore passagemaking shouldn’t rely on a rusty old clunker engine to transit the ocean blue and that was just the case when John Nassichuk of Raven Marine in North Vancouver, BC was tasked with installing a new power plant into “Northern Dancer” a 43’ Hans Christian ketch. The boat’s 25+ year old Nissan diesel had served the boat admirably, but the owners wanted to do more long-distance cruising and needed dependable power. As an authorized Yanmar installer and service center, John recommended the 4-cylinder Yanmar 4JH-4-TE for the job citing a smooth-running, rubber-mounted engine would efficiently drive the heavy hull form of the Hans Christian. Due to the full keel design of the vessel, the boat had an extremely long propeller shaft that extended from the diesel amidships all the way aft to a propeller aperture at the trailing edge of the keel. Supporting the shaft was a cutlass bearing aft and a rigid pillow block several feet aft of the gearbox.

Since the original Nissan diesel was solid-mounted to the hull and the new Yanmar unit was mounted on flexible mounts, there were concerns about being able to support the industrial style prop shaft where it coupled to the new gearbox. Additionally, Yanmar stressed the use of Yanmar’s flexible motor mounts when repowering to validate the warranty of the motor. To provide adequate prop shaft support, the rigid mount pillow block bearing would need to remain in place, but how then to properly align the shaft to the rubber mounted transmission? The solution came in the form of a free floating Powertrain CV joint coupler distributed by Thermoboat in Sydney, BC. The coupler was bolted inline aft of the gearbox and provided support to the shaft without the need of building a separate bulkhead mounted CV joint.

“This was a far more economical solution,” says Nassichuck. “Building a bulkhead and then mounting a rigid CV Joint to support the shaft was going to be really expensive. This worked out great.”

When asked if there were any drawbacks to the Thermoboat Powertrain Coupler compared to a conventional shaft coupler, John made sure to stress the importance of making precise measurements when cutting or fabricating the prop shaft. “A standard 5” rubber coupler gives you a few inches of leeway when doing a shaft install. The Powertrain coupler is so small and compact, you have to measure out the shaft just right.”

Available in three sizes, the self-aligning Powertrain Coupler is designed to withstand the torque loads of engines in excess of 700 HP and can allow for up to 8 degrees of shaft deflection without requiring a supporting bulkhead mount. Once the prop shaft was properly cut and the new diesel lowered into place, it took just a few hours to finish hooking up the shaft and tightening the remaining bolts throughout the diesel. While this installation was done as part of a repower project, Nassichuk estimates that installing the coupler on diesels already in the boat would likely take far fewer hours than if a bulkhead coupler was utilized. Also John noted that the coupler comes pre-lubricated from the factory and requires little or no maintenance during the life of the powertrain.

With a new diesel in place and the prop shaft hooked up, the Northern Dancer’s owners took off on their first cruise in years without worrying if the engine would give up on them when they needed it most. And while a new power plant wasn’t the least expensive modification they’d ever done to the boat, it was one of the best values when it came to peace of mind and reliability.

www.thermoboat.com

By Chuck Gilchrest

Destinations

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Toronto sailor and former RCYC coach/sailing instructor Ryan May is now a US coast guard captain ...
Just before the weekly party at Shirley HeightsSunsail staffer Chris Donahue conducts our chart ...
Chartering in the Caribbean conjures up images of turquoise sea, palm fringed beaches and great ...
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You’re on your way east to the 1000 Islands or the Trent-Severn. By entering north of Prince ...
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Cowichan Bay to Genoa Bay – Almost the Gulf Islands

Cowichan Bay to Genoa Bay – Almost the Gulf Islands

 By Catherine Dook

“So you’re going offshore to Genoa Bay,” said an old salt at coffee that morning. Genoa Bay was 15 minutes away from our homeport of Cowichan Bay and hardly counted as offshore, but it was our first destination that fall. The fog had socked us in all that morning, so John and I drank coffee and gossiped with the neighbours while waiting for the weather to lift. We’d provisioned with cans of chilli, a sack of apples, and tanks full of water. We’d tested the engine and the anchor winch. We were ready.

Read More of Cowichan Bay to Genoa Bay.....

 

 

 

Lifestyle

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One of our most enthusiastic contributors, Rob Dunbar sent us this photo from Halifax.   ...
Checking back into the US was quick and painless. We made the call to Customs but we needed to ...
Two-hundred-year-old homes are what ghost stories are made of, and Beaconsfield Yacht Club (BYC) ...
This time our photos come from Gimli where Katie Coleman Nicoll was on the scene. She’s an ...
Recently we celebrated our country’s 150th anniversary, and in true form thousands of ...
   We left off Part 1 at the year 1914, and will here pick it back up, running through ...
This week’s POTW comes from across the pond. Who knew we had a European audience   ...
Here is our boat anchored at Hockey Stick Bay. We live in a beautiful country.     ...
Michelle Jacques of Cambridge ON share this memory of her adorable pooch. “This is Frodo. ...
  Our 150 year history began in 1867, but Canada was no stranger to watercraft prior to our ...

 By: Katherine Stone

Do you know how many boaters you run into while standing in the lift lines of Blue Mountain and the surrounding private ski clubs? Quite a few! Start some conversations on the ski lifts and you might be surprised how many avid boaters you can meet.

Many who boat say that winter sports are just there to pass the time until the ice clears and you can get your boat launched and start boating again. As a ski instructor, you tend to meet even more interesting boaters… Read more about the Reef Boat Club ....

 

 

Boat Reviews

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Commodore’s Boats is a full service shipyard with over 50 years of generational history and ...
Cruisers Yachts debuts the all-new 42 Cantius. The sporty, luxury cruiser will make its first ...
Hull #1 ZINNIA, the all-new, twin outboard MJM 35z left Boston BoatWorks on July 5 for Newport and ...
Following a 10-year hiatus, Richmond, BC-based Crescent Custom Yachts is once again launching ...
According to the folks at Fraser Yacht Sales, you couldn't ask for more - the new Azimut Atlantis ...
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The Rossiter 23 Classic Day Boatis both a logical extension of the Canadian-built Rossiter line and ...
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Canadian Yachting magazine readers will certainly be familiar with the Cruisers Yachts line of ...

 

Marine Products

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With all the devastation in the eastern Caribbean a natural question to ask is ‘is our boat in that ...
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  Still looking for the perfect slip for your boat? Look no further!    
Canadian Yachting traveled to Newport to review and sea trial the new MJM 35z.     ...
Erik Pawson Of Watertight Boatworks here in North Vancouver, BC, is really passionate about the ...
Hydro Clean Hull Wash is Canada's first automatic, mechanical hull wash system and the company has ...
For 2017 there were a total of 31 events planned and 2 were cancelled for a total of 29 events. All ...
When Terry Conrad, of Conrad Marine, offered me ride in a brand-new Sea Fox 288 Commander that he ...
EMCS Industries Ltd. has a unique antifouling system that’s quite clever and incredibly ...

By Owen Hurst

Since the initial article of this series we have looked at the iPad and its use as a marine navigation instrument. We have discussed its functionality, available apps, relevant hardware and compared it to traditional charplotters. This focus on iPad led one of our readers to an interesting question that we have yet to address.

Question: Why has the focus been solely on the use of iPads for marine navigation rather than Android devices?

Read More Going iPad or Android.....