Cummins 4BT Complete Engine Motor 3.9L Turbo Diesel 4 Cylinder 150HP 12V
Cummins 4BT Complete Engine Motor 3.9L Turbo Diesel 4 Cylinder 150HP 12V
Delivered NZ-wide
Fully insured & tracked · GST and entry fees payable to NZ Customs on arrival
Est. delivery Tue 10 Nov – Sun 15 NovAvailable to order
Next shipment on the way
Contact us for lead timeOne year 'no bull' warranty
Every engine includes a 1-year warranty covering manufacturing and assembly faults, with 2 and 3-year Platinum cover available. Heat tabs are fitted so claims are simple and transparent. Installation by a qualified mechanic with a tax invoice is required to activate cover.
Don't get burned by cheap "suppliers"
Plenty of engines sold as "new" or "remanufactured" are worn cores with fresh seals and a coat of paint. Ours are built from new components only, hot tested before dispatch with QR-linked video proof, and carry a written warranty handled by our own team.
What makes Crate Engines the best choice?
- Brand new, never rebuilt – zero kilometres
- Known factory weak points engineered out
- No exchange or core charge – keep your old engine
- GST and entry fees payable to NZ Customs on arrival – no surprise fees on arrival
- Real people who know engines, Australian owned since 2017
Not sure it fits? Check with your VIN
Send us your VIN or engine code before you order and we'll confirm the exact engine for your vehicle. Use the quote button above or contact us.
High Quality Cummins 4BT
Cummins 4BT
- Top Quality Manufacturer Selected.
- Common Engine Design Issues Fixed / Resolved.
- One Year Product Warranty Included as Standard
- Directly Plug & Play Engines. No Modifications Required.
Customer Reviews
Hundreds of High Quality Positive Reviews.
Ultra Tune CEbay Purchase
Straight Drop in Plug and Play. Customer was happy. No Complaints so far after 4 Months.
Steven PWebsite Purchase
Might have been cheaper to buy second hand but the warranty justified the extra 2k. Happy.
Bowenville RepairsWebsite Purchase
2nd Motor purchased from this crew and delivered within the 12 day period. Both motors running well as they should for the price.
Mechanic Near MeWebsite Purchase
Good Quality Overall. Cant fault them. Interesting to see in 5-10 years time how these motors run, but for now they are great.
Rebecca P.Ebay Purchase
I-load Motor purchased October 22. Continues to run till Present. Happy with my Purchase would recommend to anyone that needs a quality engine.
John Q.Website Purchase
Very Good. Delivery took 15 Days but we are still happy. The Product Quality was as Described. Wouldn’t hesitate to purchase again.
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How it Works?
Learn more
Shipping & Handling
- Flat-rate freight, NZ$710 North Island or NZ$790 South Island anywhere within New Zealand.
- All Crate Engines are Shipped with Team Global Express.
- Delivery is typically 5-8 business days from our Queensland warehouse.
- All Crate Engines are shipped with Insurance as Standard.
5 Main Differences
What Makes Crate Engines the Best Choice?
-
Centra Steel Crankshaft:
Our crankshafts are made from Centra Steel, offering superior compressive strength compared to forged steel, ensuring durability and long-lasting performance. -
Precision Tolerances:
We maintain crankshaft tolerances of no more than 2S, delivering exacting precision that guarantees smoother operation and reduced wear over time. -
OEM Precision Design:
Our engines are built to a 1:1 specification, with 98% of the original OEM design followed, ensuring compatibility and reliability. -
Skilled Workforce:
Every engine is assembled by highly skilled employees with a minimum of 5 years of hands-on engine-building experience, ensuring expertise and attention to detail. -
High-Grade Aluminum:
We use only high-grade aluminum for the engine head and block (where applicable), ensuring lightweight strength and heat resistance, vital for engine longevity.
Be Assured with
Warranty & Returns
- All Crate Engines include a 1 Year Manufacture Warranty.
- Certain Guidelines Must be Followed in order to ensure this Warranty is accepted upon the event of a failure.
- Our website will Store your information, so if a warranty issue does come up, we have all your details.
- Please see our Warranty or Returns Sections.
- Returns are Accepted within 7 Days, providing the Engine has not be Used / Dismantled.
- Extended Warranty available on Checkout!
More Information about
Cummins 4BT
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Brand New Complete Cummins 4BT Engine
Crate Engines NZ offers this brand new Cummins 4BT Engine as a complete motor with a 3.9L four-cylinder turbo-diesel configuration, advertised 150hp output and 12V electrical specification. This 4BT Crate Engine is available for replacement and repower projects where the supplied engine build matches the intended application.
CAPACITY3.9LInline four-cylinder turbo diesel
OUTPUT150hpApproximately 112kW, advertised
ELECTRICAL12VElectrical system specification
SUPPLIED ASComplete motorConfirm the package before ordering
The motor is supplied brand new. It is not a used engine or a remanufactured assembly. Its complete-motor configuration includes the external components specified on the written order, allowing buyers and installers to confirm the package before purchase.
Cummins 4BT Engine specifications
| Engine model | Cummins 4BT |
| Capacity | 3.9 litres |
| Configuration | Inline four-cylinder |
| Fuel type | Diesel |
| Aspiration | Turbocharged |
| Advertised output | 150hp, approximately 112kW |
| Electrical specification | 12V |
| Condition | Brand New |
| Supplied configuration | Complete Motor |
The 12V specification refers to the electrical system. Rated engine speed, torque and duty classification must be checked against the supplied engine’s data plate and build documentation. The advertised 150hp output should not automatically be interpreted as a continuous-duty rating.
What is included with the complete motor?
This Cummins 4BT Engine is offered as a complete motor. The exact accessory package must be confirmed against the product photographs and written order, as complete engines can be configured differently for different installations.
Confirm these before ordering
Before ordering, confirm the turbocharger, injection pump, injectors, fuel lines, manifolds, starter motor, alternator, flywheel and flywheel housing supplied with the assembly. Also check whether any mounting brackets or application-specific fittings are included.
TurbochargerInjection pumpInjectorsFuel linesManifoldsStarter motorAlternatorFlywheelFlywheel housingMounting bracketsApplication-specific fittings
Only included when specifically listed on the order
A complete 4BT Crate Engine may still require external installation components. A radiator, intercooler, transmission, exhaust system, wiring, conversion mounts and connecting pipework are only included when specifically listed on the order.
RadiatorIntercoolerTransmissionExhaust systemWiringConversion mountsConnecting pipework
Choosing a 4BT Crate Engine for your application
Matching the engine name is only the first step when purchasing a replacement. Different 4BT builds can use different sumps, engine mounts, flywheel housings, accessory positions and fuel-system settings.
Replacing an existing engine
- ✓Original engine serial number
- ✓CPL or build information
- ✓Clear photographs
These details help establish whether the replacement Cummins 4BT Engine matches the existing equipment or requires components to be transferred.
Repower project
- →Engine-bay space
- →Operating weight
- →Transmission compatibility
- →Cooling capacity
- →Required duty cycle
A suitable 4BT Crate Engine must match the demands of the finished installation as well as the available space.
Mounting, transmission and electrical checks
Before fitting the engine, compare the mounting points, sump clearance, flywheel arrangement and transmission connection. Check the position of the intake, turbocharger outlet, exhaust connection and cooling hoses.
Mounting pointsSump clearanceFlywheel arrangementTransmission connectionIntake positionTurbocharger outletExhaust connectionCooling hoses
The 12V starting and charging equipment must be compatible with the installation. Confirm the starter and alternator specifications where these components are included, together with the required battery, cables and controls.
The complete motor is not a universal conversion kit. Vehicle and machinery installations may require additional brackets, adapters, plumbing, wiring or other application-specific components.
Preparing your 4BT Crate Engine for installation
Before installing the replacement engine, identify why the original motor failed. Inspect the cooling system, fuel supply, intake and exhaust for contamination, restrictions or damage that could affect the new assembly.
Use the correct fluids, filters, priming procedure and commissioning instructions for the supplied engine. The installer should check oil pressure, coolant temperature, charging operation and fluid leaks before placing the engine under load.
Oil pressureCoolant temperatureCharging operationFluid leaks
For machinery operating for extended periods, confirm that the engine’s rated speed and duty classification suit the job. Selecting a 4BT Crate Engine by horsepower alone does not establish its suitability for continuous operation.
Order your complete Cummins 4BT Engine
Contact Crate Engines NZ with your application details to confirm availability, supplied accessories, freight arrangements and warranty terms. Providing the original engine identification and installation photographs helps establish the correct package before dispatch.
Application detailsOriginal engine identificationInstallation photographs
Browse our range of replacement crate engines for other options. Manufacturer information and engine-identification assistance are available through Cummins parts and support.
For customers seeking a brand new complete 4BT Crate Engine, this 3.9L, 150hp, 12V motor provides a clearly specified starting point for a properly matched replacement or repower project.
Cummins 4BT Engine FAQs
Is this Cummins 4BT Engine brand new?
Yes. The motor is supplied brand new. It is not a used engine or a remanufactured assembly.
What does complete motor mean?
Its complete-motor configuration includes the external components specified on the written order. The exact accessory package must be confirmed against the product photographs and written order, as complete engines can be configured differently for different installations.
Does the 4BT Crate Engine include a radiator, transmission or wiring?
A complete 4BT Crate Engine may still require external installation components. A radiator, intercooler, transmission, exhaust system, wiring, conversion mounts and connecting pipework are only included when specifically listed on the order.
Is the 150hp figure a continuous-duty rating?
No. The advertised 150hp output should not automatically be interpreted as a continuous-duty rating. Rated engine speed, torque and duty classification must be checked against the supplied engine’s data plate and build documentation.
What does the 12V specification refer to?
The 12V specification refers to the electrical system. The 12V starting and charging equipment must be compatible with the installation, so confirm the starter and alternator specifications where these components are included, together with the required battery, cables and controls.
Will this engine drop straight into my existing installation?
Matching the engine name is only the first step when purchasing a replacement. Different 4BT builds can use different sumps, engine mounts, flywheel housings, accessory positions and fuel-system settings. Provide the original engine serial number, CPL or build information and clear photographs so the replacement can be compared with the existing equipment.
Is this a conversion kit for a repower project?
No. The complete motor is not a universal conversion kit. Vehicle and machinery installations may require additional brackets, adapters, plumbing, wiring or other application-specific components.
What do you need from me before ordering?
Contact Crate Engines NZ with your application details to confirm availability, supplied accessories, freight arrangements and warranty terms. Providing the original engine identification and installation photographs helps establish the correct package before dispatch.
Built properly
What's inside this engine
Built to OEM+ specification with the known factory weak points engineered out, and quality tested before it leaves our warehouse.
Forged crankshaft
High-strength steel crankshaft with precision tolerances for durability and smooth operation.
Upgraded pistons
Common OEM piston and head cracking issues resolved with improved materials.
Improved oil galleries
Redesigned oiling to eliminate the starvation issues that kill factory motors.
Hot tested
Run-tested before dispatch, with QR-linked video proof of your unit.
Heat tabs fitted
Calibrated heat tabs keep warranty coverage transparent for you and for us.
QR traceability
QR code on every engine for full build and dispatch traceability.
Crated & insured
Packed for heavy freight and shipped fully insured to New Zealand, tracked all the way.
Direct fitment
Built to match your engine code — no modifications, no guessing part numbers.
Know what you're buying
New vs reconditioned crate engines
Plenty of engines sold into New Zealand are old, patched motors with new seals, called "remanufactured". Here's the honest difference with a brand new crate engine.
What we sell
Brand new crate engine
Built from new components only, to OEM+ specification, with the known factory weak points engineered out.
- Forged steel crankshaft, upgraded pistons, improved oil galleries
- Zero kilometres — no unknown history, no wear
- Hot tested with QR video proof on every engine
- Heat tabs fitted for transparent warranty coverage
- 1-year warranty standard, 2–3 year Platinum available
- No exchange required — keep your old engine
The old way
Reconditioned / used
A worn core with new seals and gaskets — the internals, and the history, are whatever they are.
- Unknown kilometres, service history and prior abuse
- Original worn internals retained under new gaskets
- Rarely tested before sale — you're the test
- Core charges and exchange units required
- Typical warranty: 3 months, if any
- Early failures inherit the old engine's problems
Before you fit it
Plan the job around the whole vehicle
A new engine only lasts if the reason the old one failed is fixed. Your mechanic should check these before fitting.
Find the original cause
Overheating, cooling faults, blocked intakes or fuel issues that killed the old engine will kill the new one too. Diagnose and fix them first.
Check the parts you reuse
Radiator, hoses, injectors, turbo, intercooler and sensors carried over from the old engine should be inspected, cleaned or replaced.
Follow the fitting requirements
Fitted by a qualified mechanic with a tax invoice, correct fluids and a proper first start-up. This keeps your warranty active.
From our warehouse
To your workshop
Delivered NZ-wide
Crated for heavy freight and shipped fully insured and tracked to your door or workshop anywhere in New Zealand.
No surprise fees
Prices are in NZD excluding GST. NZ Customs collects GST and entry fees when the engine arrives, so there's one payment to us and one to Customs.
Real support. Written cover.
A 1-year written warranty handled by our own team, plus 7 days to arrange a return on unused engines.
Before you buy
Engine replacement FAQs
Not sure this is the right engine? Send us your VIN or engine code and we'll confirm fitment before you pay.
Is this engine brand new?
Yes. Built from new components only — not reconditioned, not second-hand, zero kilometres.
What's included with the engine?
This is a long block. Accessories such as the turbo, injectors, pumps, sensors and manifolds are transferred from your existing engine unless listed otherwise. Check the description or ask us if unsure.
Will I pay GST or customs fees on delivery?
Yes. Prices are in NZD excluding GST. When the engine arrives, NZ Customs collects 15% GST plus an import entry transaction fee and biosecurity levy (around NZ$172 combined) before it is released. Engines are duty-free. You pay those charges directly to Customs, not to us.
How long does delivery to New Zealand take?
The estimated delivery window is shown next to the Add to cart button. We'll send tracking as soon as your engine is dispatched.
How does the warranty work?
1-year warranty covering manufacturing and assembly faults, with 2 and 3-year Platinum cover available. Installation by a qualified mechanic with a tax invoice is required to activate cover.
Do I need to send my old engine back?
No. No core charge and no exchange — keep or sell your old engine.
Fitment check
Get it right the first time.
Send us your VIN or engine code and our team will confirm the exact engine for your vehicle — before you pay.