Craftsman Marine CM4.42 42HP Diesel Boat Engine

Description

Repower projects requiring 42 HP at 3000 RPM, a 1.758 L four-cylinder engine, and analogue instrument-panel wiring can use the Craftsman Marine CM4.42. This naturally aspirated vertical marine diesel engine uses indirect fuel injection with a mechanical Bosch-type injection pump and accepts marine diesel meeting EN 590 or ASTM D975 No. 2-D. The specified 175 kg bobtail dry weight should be assessed with the engine-bed structure and vessel trim plan.

Its indirect closed-loop freshwater cooling system uses a heat exchanger and intercooled exhaust manifold. A 12V, 90-amp alternator is listed, and NMEA 2000 output requires an external gateway module. The supplied application data identifies auxiliary inboard propulsion for specified 22 to 35 foot cruising sailboats, sloops, catamarans, inland canal boats, and traditional day-boats.

Key Specifications of the Craftsman Marine CM4.42 Diesel Boat Engine

• The inline four-cylinder vertical engine displaces 1.758 L, defining the stated naturally aspirated marine diesel configuration for auxiliary inboard propulsion.
• Output is rated at 42 HP, or 30.9 kW at the crankshaft, at a specified full-throttle speed of 3000 RPM.
• Indirect fuel injection uses a mechanical Bosch-type pump and accepts EN 590 or ASTM D975 No. 2-D marine diesel.
• An indirect closed-loop freshwater system uses a heat exchanger and intercooled exhaust manifold for the specified cooling arrangement.
• The 12V, 90-amp alternator provides listed charging capacity, requiring suitable wiring and electrical-system planning aboard the vessel.
• An analogue instrument-panel interface is specified, while NMEA 2000 output requires the separately listed external gateway module.
• Dry weight is 175 kg in bobtail configuration, providing a stated load for engine-bed and lifting-planning assessment.

Controls and Auxiliary Propulsion

This Craftsman Marine diesel boat engine has a 78.0 mm x 92.0 mm bore-and-stroke specification and a 22.0:1 compression ratio. Its analogue instrument-panel interface should be evaluated alongside the planned control and display system. NMEA 2000 output is supported through an external gateway module, so that component must be included where network integration is required.

The supplied application range identifies auxiliary inboard use for 22 to 35 foot cruising sailboats, sailing sloops, catamarans, small-displacement inland canal boats, and traditional day-boats. Buyers should assess engine output, vessel displacement, transmission selection, propeller sizing, engine-bed capacity, and cooling-system layout against the complete propulsion installation.

Why Choose the Craftsman Marine CM4.42 Diesel Boat Engine

The CM4.42 diesel boat engine combines 42 HP at 3000 RPM with a naturally aspirated 1.758 L inline four-cylinder configuration. Its 175 kg bobtail dry weight, mechanically controlled indirect injection, heat-exchanger cooling, intercooled exhaust manifold, 90-amp alternator, analogue instrument interface, and external-gateway NMEA 2000 option provide defined comparisons for an auxiliary inboard propulsion package on the listed vessel range.

Installation and Service Considerations

Verify that the engine bed and lifting arrangement support the stated 175 kg bobtail dry weight before installation. Plan the closed-loop freshwater circuit, raw-water heat-exchanger connections, exhaust-manifold routing, fuel supply, alternator wiring, and analogue dashboard harness. Include the external gateway module when NMEA 2000 output is needed, and follow applicable Craftsman Marine documentation for the complete propulsion and control-system installation.

Warranty and Support

Craftsman Marine provides a 24-month or 1,000-hour international warranty for non-commercial pleasure applications, whichever occurs first. When the commissioning form is completed and submitted, an additional 48-month or 2,000-hour limited warranty period applies to specified non-moving engine parts, subject to the applicable terms and operating-hour limits. Mulmarine.com can assist with product details and order-related questions before purchase. Please review the warranty coverage and eligibility details on Mulmarine.com before purchase.

Before Ordering the Craftsman Marine CM4.42 Diesel Boat Engine

Verify that your vessel falls within the listed auxiliary-propulsion application range and supports the 42 HP at 3000 RPM output and 175 kg bobtail dry weight. You should confirm engine-bed capacity, transmission and propeller selection, freshwater and raw-water cooling routes, exhaust routing, EN 590 or ASTM D975 No. 2-D fuel supply, 12V electrical connections, analogue dashboard wiring, and external-gateway requirements for NMEA 2000 output.