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| Repower Articles |
| Bossea - Repowering a Trojan International 10 Meter |
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| Johnson and Towers for a period of time modified the
DD 8.2L to produce a 300 HP model with a near exact same form and fit. That
might have worked, but they're no longer making them, and a used engine
wasn't considered a viable option. Detroit Diesel still sells remanufactured
8.2Ls with full warrantees, but only at 250 HP, so that wasn't an option
either. |
The search was broadened to include Volvo, Caterpillar, Cummins,
and Yanmar. After quite a bit of research, it appeared that Cummins and
Yanmar provided the most promising options based on reports of reliability,
cost, weight, and fit. The Cummins models considered were the 330B and 370B.
The Yanmar models considered were the 6LYA-UTE and 6LYA-STE. The Cummins
seemed to have the edge based on its longer record of reliability, less
expensive parts, and simpler design than the Yanmars. So, the choice was
Cummins, and the next step was finding someone to do the repower.
A call to the Southern California Cummins distributor,
Cummins Cal Pacific, yielded two recommendations for repower specialists.
After meeting with both, having them visit the boat, and providing cost
and completion date estimates, Seaboard Marine of Oxnard was chosen to perform
the work. Their ability to do the work in their own yard, and their ability
to fabricate any needed part right on site was a key factor in the decision.
However, this exercise led to the first major hiccup in the project. As
a part of the estimate, careful measurements of BOSSEA's engine room were
taken and showed that the Cummins were too tall to fit without major modifications
to the boat. Tony Athens of Seaboard Marine told me he added Yanmar to his
repower options a few years earlier for just this reason. The Yanmars will
fit in some spaces where nothing else of equivalent power will fit. So,
Cummins lost a sale and Yanmar gained one.
The Yanmar model selected was the 6LYA-STE which is
rated at 345 SAE HP at 3300 RPM. |
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| Installation of 6LYAs |
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| Here's Bill getting ready
to position the new starboard engine. (Notice the bagging and other protection
that protects the rest of the boat while the "dirty" work is being done). |
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| Although these engines were the big dollar
items in the repower, there were dozens of other items to consider. Some
of these items were mandatory as a result of the increase in engine horsepower
over the DD 8.2's, and some were elective. For example, BOSSEA had an Onan
7.5 KW genset model MDJE. It produced plenty of juice, but was noisy, smoky,
and vibrated like crazy. As part of the repower it would be replaced with
a new Onan 9 KW genset model MDKAL with sound shield. Pulling the engines
for a repower is a great time to take care of other work in the engine compartment
that may otherwise be extremely difficult, or even impossible. |
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| The port engine is roughed
into place. Note the custom-made rear and forward mounting brackets. Both
were fabricated at Seaboard. The existing stringer cap bracket (painted
white and bolted to stringer) was reused to avoid major rework to the stringers. |
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