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Deere expands marine diesel range.


John Deere Power Systems (JDPS) used the late 2008 and early 2009 commercial and pleasure boat shows to launch its highest output marine diesel engine. The launch of a new 13.5 L model joins new 6.8 and 9.0 L models in the John Deere line, and expands the company's engine range for both pleasure and commercial boats.

The new engines, all six-cylinder models, are notable for significant increases in power density throughout.

The 13.5 L PowerTech 6135SFM75 marine diesel has outputs from 410 hp at 1800 rpm to 750 hp at 2200 rpm, and is a six-cylinder, electronically controlled, turbocharged and air-to-seawater aftercooled design.

Dave Flaherty, marine marketing manager for JDPS said the new 6135SFM75 is "by far the most powerful marine engine produced by John Deere." Flaherty noted the output is a big leap from its predecessor, Deere's 12.5 L, 610 hp diesel.

Targeted marine applications include cruisers, trawler yachts, houseboats and other recreational applications, with the new 6135SFM75 engine seen as especially suited for sportfishing boats.

The PowerTech 6135SFM75 is also available in other ratings, Flaherty said, starting with an M 1 rating of 410 hp at 1800 rpm. "This is also the first time we have offered an M5 recreational rating on a displacement this large," Flaherty said.

The four-valves-per-cylinder engine is seawater aftercooled, and features a redesigned water-cooled exhaust manifold to enhance exhaust gas flow and power output, along with a redesigned cylinder head for better coolant flow. Also featured is a high-pressure electronic unit injector (EUI) for increased injection pressure. The EUI provides variable timing control, multiple injections and control over the duration of the injection.

The new 9.0 L PowerTech 6090SFM75 has ratings from 325 hp at 2100 rpm to 500 hp at 2400 rpm. It is also a six-cylinder, electronically controlled, turbocharged diesel, with seawater aftercooling. Like the 13.5 L, the new 9.0 L design has four valves per cylinder, but utilizes a high-pressure common rail fuel injection system, and a water-cooled exhaust manifold with integrated thermostat housing.

Flaherty said the new 9.0 L marine diesel is able to achieve higher power and lower ambient temperatures by using a water-cooled casing on the turbocharger. The engine has a closed crankcase ventilation system and the heat exchanger is integral with the coolant top tank.

The 6.8 L PowerTech 6068AFM75 has outputs from 230 hp at 2300 rpm to 330 hp at 2600 rpm and is a six-cylinder, electronically controlled, turbocharged engine with heat exchanger or keel-cooled options. Flaherty said the lower engine speeds provide for better vessel control and maneuvering, as well as limiting vibration and noise. The 6.8 L also has a water-cooled turbocharger and exhaust manifold.

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Title Annotation:MARINE PROPULSION; John Deere Power Systems
Publication:Diesel Progress North American Edition
Date:Apr 1, 2009
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