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Craftsman Marine CM4.42 Marine Engine
Explore the Craftsman Marine CM4.42 diesel engine, checked against key specs, features, and performance details to help choose the right marine engine for the work: a dependable four-cylinder diesel for boat builders, dealers, and distributors who need proven power with a manageable service footprint.
- Seawater resistant cast exhaust bend, providing a long and efficient service life.
- Cupronickel heat exchanger resistance to corrosion.
- Air inlet silencer.
- Fitted with electric fuel lift pump.
- Based on a Mitsubishi industrial engine, proven world-wide and with an equally world-wide support.
- Complies with RCD II regulations.
| Basic Engine | Mitsubishi |
|---|---|
| Cylinders | 4 In Line |
| Cylinder Capacity | 1.758 cm³ |
| Power | 30,9 kW / 42 hp |
| Max. Engine Speed | 3.000 rpm |
| Max. Torque | 105 Nm |
| Aspiration | Natural |
| Alternator | 90 A / 12 V (Bosch / SEG) |
| Cooling System | Indirect, With Heat Exchanger |
| Flexible Engine Mounts | CM Type 5 |
| Calorifier Connection | Optional |
| Exhaust Diameter | ø50 mm |
| Electronic Protection | 10 A Circuit Breaker |
| Stop Solenoid | Energized To Stop |
| Max. Installation Angle | 15° (Backwards) |
| Weight | 175 kg |
| CM4.33, CM4.42, CM4.52 Manual 30072019_web |  |
|---|---|
| CM4_spareparts_catalogue | |
| CM433_CM442_manual_web_DE | |
| CM433_CM442_manual_web_DK | |
| CM433_CM442_manual_web_EN | |
| CM433_CM442_manual_web_FI | |
| CM433_CM442_manual_web_NL | |
| CM433_CM442_manual_web_NO | |
| CM442_Engine_with_ZF25_GearBox | |
| CM442_Engine_without_GearBox |  |
| CM442_performance | |
Applications & Compatibility
The CM4.42 fits mid-sized builds that need more torque than a 2- or 3-cylinder option without moving up to the CM4.65/CM4.80 range:
- Motor cruisers, trawlers, and displacement launches needing steady mid-range torque
- Workboats and fishing vessels running longer hours at moderate loads
- Compatible with the ZF25 gearbox for straightforward drivetrain integration
- Repower projects stepping up from a 2- or 3-cylinder Craftsman Marine engine
Built for Boat Builders & Dealers
For a boat builder or distributor, the CM4.42 is less about one engine sale and more about what happens across a whole production run. Its Mitsubishi core is shared with parts networks worldwide, its manuals cover six languages for regional teams, and each unit leaves the line to the same spec, so bulk orders and OEM integration stay predictable. Craftsman Marine’s distributor network then carries that support forward after delivery.
Technical Advantages
The CM4.42 keeps its running costs down through a handful of specific design choices, not just general build quality:
- Indirect cooling with a heat exchanger keeps raw seawater away from internal components
- Electric fuel lift pump simplifies fuel priming and reduces a common failure point
- Energized-to-stop solenoid gives a dependable, fail-safe shutdown
- 10 A circuit breaker for straightforward electrical protection
Why Choose the CM4.42 Marine Engine
The CM4.42 sits in the range for builders who want more torque than the 2 or 3-cylinder engines without the added bulk of the CM4.65/CM4.80 class. Its appeal for dealers is largely about what doesn’t go wrong afterward: common parts, a straightforward service routine and compliance already in place.
- Mitsubishi-based industrial engine platform, proven and supported worldwide
- Cupronickel heat exchanger and seawater-resistant cast exhaust bend for long-term corrosion resistance
- Electric fuel lift pump and air inlet silencer for smoother day-to-day operation
- Complies with RCD II regulations for recreational craft
- 175 kg build with CM Type 5 flexible engine mounts for straightforward installation
Frequently Asked Questions
The CM4.42 moves to a 4-cylinder Mitsubishi block (1.758 cm³) and 105 Nm of torque, a step up in both size and mounting requirements (CM Type 5) from the 2 and 3-cylinder engines, aimed at builds that outgrow the smaller range.
Yes, the CM4.42 is fitted with an electric fuel lift pump, which simplifies fuel priming compared to a manual lift pump setup.
The CM4.42 pairs with the ZF25 gearbox; documentation is available in the Downloads section, alongside a no-gearbox configuration for custom drivetrains.
The CM4.42 is naturally aspirated. For turbocharged output on the same block, see the CM4.52.
It weighs 175 kg and is fitted on CM Type 5 flexible engine mounts, with a maximum installation angle of 15° backwards.
The CM4 spare parts catalogue and the shared CM4.33/CM4.42/CM4.52 manual (in EN, DE, DK, FI, NL, NO) are listed in the Downloads section on this page.