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The New Cummins 4B 3.3-M      65 HP @ 2600 RPM


65 HP @ 2600 RPM

   Trans Atlantic Diesels is proud to offer the "Newly Marinized Cummins 4B 3.3-M" Diesel Engine.

   This rugged engine package is designed with the serious boater in mind.  The max 65 hp is achieved at just 2600 RPM. At an amazingly low 1800 RPM this engine delivers almost 55 HP.  Ideal for those long cruises.

   The low engine speed contributes to the high torque and durability of the engine.

Lower engine speed also equals lower fuel consumption, lower noise level, lower operating cost and longer life! 

Cummins 4B 3.3-M marinized by Trans Atlantic Diesels
Cummins 4B3.3-M marinized by Trans Atlantic Diesels In keeping this unit easy to maintain and operate some key features are:

1. Mani-Cooler: The engine utilizes the highly proven and efficient one-piece combination heat exchanger, water-cooled exhaust manifold and header tank assembly. This greatly reduces the amount of plumbing on the engine as well as reducing the potential for coolant leaks. Cleaning and disassembly of this unit requires no more than a screwdriver. Remove the non-corrosive neoprene end caps and simply pull out the tube bundle. 

2. Jabsco raw water pump: Gear driven and flanged-mounted off the front timing cover, creating reliability and ease of accessibility for servicing. With durability in mind this pump utilizes not one but 2 sealed bearings.
3. High Output Balmar with HD 11/16th inch Drive Belt: The fresh water circulating pump and standard 60 amp alternator are driven by a heavy-duty 11/16th inch belt. (Typically an engine of this size uses a smaller 3/8" - 1/2" belt.) The single HD 11/16th inch belt enables the use of a high-output alternator, without the headache and expense of converting to double pulleys and double belts. When ordering the engine a Balmar high output alternator can be specified and delivered with it already installed and connected. Standard options include the latest Balmar model 6-Series 70 amp and 100 amp. Connected to the state of the art fully programmable multistage regulator type 614.  Alarms sensors can be supplied for high battery and alternator temp. These automatically reduce the output of the alternator to allow cooling.

4. Double Crankshaft Pulley: For driving other accessories such as a refrigeration compressor, a double groove crankshaft pulley is an available option.

5. Electric Fuel Pump: The injector pump has a built-in transfer pump. For added reliability a back-up electric fuel transfer pump is fitted. 

6. Deluxe instrument panel: Oil pressure Gauge, Water Temp Gauge, Voltmeter, Tachometer incorporating LED Hour meter, Key Switch and spare momentary switch for accessory use.  Alarm System Indicating High Water Temperature and Low Oil Pressure warning. Engine Shut Down via key switch to avoid the installation of manual pull cable. 10 , 15 and 20 foot extension harnesses available.

7. Transmission Selection: A rugged engine deserves a rugged transmission! For this we strongly recommend the PRM 260. This top of the line, hydraulically operated gear, will run continuously in either direction (your propeller rotation preference). A lock-up "get you home" feature is standard. Other features include external oil pump and control valve, and a split casing with cast iron construction. It is available with a 3.50 inch Offset drop or parallel output. Other popular transmission options include the Hurth HBW 250 and the Borg Warner Velvet Drive 71 or 72 series. A standard SAE #4 bell housing is used for simplifying the attachment of any commonly used marine gear. We would be happy to discuss fitting your existing transmission if desired.

8. Oil and filter changes: Easy, a hand oil change pump is fitted as standard. Fuel and oil filters are both spin-on type. Change intervals are recommended at 500 hrs. fuel and 250 hrs. oil.

Installation Dimensions - Cummins 4B 3.3-M





Engine Model: 4B3.3-M Rating Type: Intermittent 
Rated Engine Power: 65 bhp  (48.5kw) Rated Engine Speed: 2600 RPM
High Idle Speed Range (No Load): 2850 RPM Idle Speed: 800 RPM
Engine Torque: 131.3 ft.lb  (179 Nm) Brake Mean Effective Pressure: 99.5 psi  (687 kPa)
Piston Speed: 1963 ft/min  (9.9 m/sec) Average Noise Level: 94 dBA @ 1M
Firing Order: 1 - 3 - 4 - 2 Number of Cylinders: Four
Configuration: In-Line Aspiration: Natural
Bore: 3.74 in.  (95 mm) Stroke: 4.53 in.  (115 mm)
Displacement: 3.3 L  (199 in.³ ) Cycle: 4 Stroke
Compression Ratio: 18.8:1 Direction of Rotation Viewed at Flywheel End: CCW
Total Weight - Dry - Less Gear: 554 lbs. Total Weight - Dry - Including PRM Gear: 660 lbs.
Total Weight Dry Including Hurth HBW 250 Gear: 594 lbs. Total Weight - Wet - Including PRM Gear: 700 lbs.



Fuel Pump Type: Zexel VE Injectors: Zexel 
Max Fuel Consumption @ Rated RPM: 3.43 GPH  (12.99 L/hr) Approx. Fuel Flow to Pump @ Max RPM: 6.7 GPH  (25.4 L/hr)
Lift Pump Type  (USCG Approved): Electric Lift Pump - Lift Capacity: 6 Ft.  (2.1 M)
Lift Pump Flow Rate:26 GPH (98.4 LPH) @ 3.5 psi* (24.1 kPa) Fuel Supply Line Restriction (Max): 3.0 in Hg. (76.2 mm Hg.)
Fuel Return Line Restriction (Max): 15 in. Hg.  (381 mm Hg.) Fuel Supply Line Size (Min): 1/4 in.  (6.4 mm) ID
Fuel Rerurn Line Size (Min): 1/4 in.  (6.4 mm) ID Fuel Filter Change Interval: 500 Hours
Heat Rejection to Fuel: 28 BTU/Min.  (0.5 kW) Governor Droop: 9%

* Normal operating pressure 3.5 psi, minimum 2.5, maximum shutoff 4 psi




Maximum Exhaust Back Pressure: 3.0 in. Hg.  (75 mm Hg.)

Exhaust Gas Flow: 324 CFM  (153 L/sec)

Maximum Allowable Static Bending Moment @ Exhaust MFD Flange : 14.8 lb.ft.  (20 N-m)
Exhaust Gas Temperature: 1117° F   (603° C)
Minimum Rise Sea Water Line to Exhaust Outlet: 12 in. (304.8 mm)
Recommended Minimum Exhaust Pipe Size: Outlet 2.5 in.  (63.5 mm)  OD



Intake Air Flow: 119 CFM  (56 L/sec)

Intake Manifold Pressure: -0.3 in. Hg.  (-8 mm Hg)

Maximum Engine Compartment Air Temperature: 140° F  (60° C)
Maximum Air Temperature at Engine Inlet: 122° F   (52° C)
Minimum Cross Section of Air Duct / Engine: 37 sq. in.   (233 sq. mm)
Heat Rejection to Ambient: 950 BTU / min    (16.7 kW)



Recommended Lube Oil: SAE 15W40,  API CH4

Oil Pressure at Idle Speed - Minimum: 31.2 psi  (215 kPa)

Oil Pressure at Normal Operating Range: 68 psi   (469 kPa)
Maximum Allowable Oil Temperature: 248° F   (120° C)
Oil Pan Capacity:  1.9 Gal US  (7.0 L)
Total System Capacity:  1.914 Gal US  (7.5 L)
Maximum Operation Angularity of Oil Pan: Front Up- 35°    Front Down- 35°   Side to Side- 35°
Low Oil Pressure Switch Setting: 15 psi  (103 kPa)
Lube Oil Filter Change Interval: 250 Hours



Coolant Capacity - Engine Only: 1.2 Gal US  (4.5L)
Coolant Capacity - Engine & Heat Exchanger:  2.9 Gal US  (11L)
Maximum External Pressure Loss in Cooling System:  5.0 psi  (35 kPa)
Standard Thermostat (modulating) Range:  180 - 203° F  (82 - 95° C)
Maximum Coolant Temperature:  212° F  (100° C)
Pressure Cap Setting at Sea Level:  7 psi  (48 kPa)
Fresh Water Flow:  34.9 GPH  (132.3 LPH)
Minimum Coolant Makeup Capacity:  2.4 Qts. US  (2.2 Litre)
Minimum Raw Water Pump Inlet Plumbing Diameter:  1.25"  (32 mm)

Minimum Raw Water Pump Inlet Restriction:  5 in. Hg.  (127 mm Hg.)

Maximum Raw Water Pump Initial Suction Lift:  6 ft.   (2.1 M)
Maximum Raw Water Pump Flow:  36.2 GPM   (137 LPM)*     * With 1.25" Inlet on Pump
Heat Rejection to Coolant:  1610 BTU / min.   (28.3 kW)
High Water Temperature Switch Setting (VDO):  205° F   (96° C)



Minimum Recommended Battery Capacity - Cold Soak @ 0° F (-18° C):  550 CCA
Reserve Capacity Minutes:  135
Maximum Allowable Resistance of Starting Circuit:  0012 Ohms
Starter Motor:  Nippondenso 12V
Alternator:  Nippondenso 12V,  60 Amp
Fuel Solenoid Type:  Energize to Run
Fuel Solenoid Current:  1.7 Amps

Email your inquires regarding Cummins  4B 3.3-M to tadinc@earthlink.net

or... Please call us at 1-800-927-9295 for more information.



This Page Last Updated April 21, 2015

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