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Craftsman Marine CM4.52 Compact Diesel Engine
Learn about the Craftsman Marine CM4.52 diesel engine, key specs, and performance details to help you choose the right engine for a vessel: a turbocharged four-cylinder diesel built for boat builders, dealers, and distributors who need more output from the same compact footprint.
- Quiet running with less vibration due to a specially designed flywheel.
- Seawater-resistant cast exhaust bend for long, efficient service life.
- Cupronickel heat exchanger resistant to corrosion.
- Fitted with an electric fuel lift pump.
- Based on a Hyundai industrial engine, proven worldwide and with worldwide support.
- Air intake with noise-reducing properties.
- Complies with RCD II regulations.
| Basic Engine | Mitsubishi |
|---|---|
| Output at flywheel | 38.9kW/52HP (ISO 8665/3046) |
| Maximum torque | 105Nm |
| Number of cylinders | 4 |
| Capacity | 1758 cm |
| Aspiration | Turbo Charged |
| Stop solenoid | Energised to stop |
| Alternator | 90 A / 12V (Bosch / SEG) |
| Max. installation angle | 15° (Backwards) |
| Maximum revolutions | 3000 rpm |
| Cooling system | indirect, with heat exchanger |
| Flexible Engine Mountings | CM type 5* |
| Calorifier connection | optional |
| Exhaust diameter | ø50 mm |
| Electronic protection | 10A circuit breaker |
| Weight | 182 kg |
| CM4.33, CM4.42, CM4.52 Manual 30072019 |  |
|---|---|
| CM4.33, CM4.42, CM4.52 Manual 30072019_web | |
| CM452_Engine_without_Gearbox |  |
| Performance curve CM4.52 | |
| Spare parts CM4.52 | |
Applications & Compatibility
The CM4.52 fits builds that want CM4.42-class dimensions with turbocharged output:
- Faster motor cruisers and semi-displacement hulls needing extra output at the same weight class
- Workboats and passenger craft that benefit from a stronger power-to-weight ratio
- Repower projects upgrading from naturally aspirated 4-cylinder engines
- Builds where turbocharged response matters more than the lowest-rpm torque figure
Built for Boat Builders & Dealers
The CM4.52 sits close enough to the CM4.42 in the range that a distributor can service both with one parts inventory and one set of manuals. That shared platform is deliberate: Craftsman Marine keeps documentation in multiple languages and specification consistent across the CM4 line, so builders can plan bulk orders without engine-specific complications, and the distributor network stands behind every unit after it ships.
Technical Advantages
Turbocharging changes the maintenance conversation slightly versus a naturally aspirated engine, here’s what actually shifts on the CM4.52:
- Turbocharging lifts output to 38.9 kW (52 HP) without adding cylinders or weight class
- Specially designed flywheel keeps running quiet with fewer vibrations
- Indirect cooling with heat exchanger keeps raw seawater away from internal components
- Electric fuel lift pump simplifies fuel priming and reduces a common failure point
Why Choose the CM4.52 Marine Engine
Dealers reach for the CM4.52 when a build needs more output than a naturally aspirated CM4.42 without moving to a different service ecosystem. Turbocharging adds the power; the shared CM4 parts and manual base keep ownership simple afterward.
- Turbocharged output of 38.9 kW (52 HP) in a familiar CM4 footprint
- Cupronickel heat exchanger and seawater-resistant cast exhaust bend for long-term corrosion resistance
- Quiet, low-vibration running from a specially designed flywheel and noise-reducing air intake
- Complies with RCD II regulations for recreational craft
- 182 kg build with CM type 5 flexible engine mounts for straightforward installation
Frequently Asked Questions
Both use the same Mitsubishi 1758 cm³ block, but the CM4.52 is turbocharged for 38.9 kW (52 HP at flywheel) versus the CM4.42’s naturally aspirated 30.9 kW (42 hp) — torque and mounts stay the same across both.
The listed configuration is CM452_Engine_without_Gearbox; gearbox pairing should be confirmed directly with Craftsman Marine via the Request for Quotation button.
Not meaningfully, it still uses the same indirect cooling, cupronickel heat exchanger and electric fuel lift pump as the rest of the CM4 range, so day-to-day servicing follows the same routine.
38.9 kW (52 HP), measured per ISO 8665/3046, with a maximum torque of 105 Nm at up to 3000 rpm.
Yes, the CM4.33, CM4.42 and CM4.52 share one manual, listed in the Downloads section alongside the CM4.52-specific performance curve and parts list.
The engine weighs 182 kg and supports a maximum installation angle of 15° backwards on CM type 5 flexible engine mountings.