Mazda MZR 2.3L Remanufactured Engine
The Mazda MZR 2.3L remanufactured engine is a fully
remanufactured 4-cylinder replacement engine designed for select Mazda
vehicles from 2006 through 2013. This MZR engine features a 2.3L
displacement, DOHC cylinder head design, 16 valves, an aluminum engine
block, and an aluminum cylinder head.
Each engine is completely disassembled and professionally remanufactured
using a structured cleaning, inspection, machining, component replacement,
assembly, and testing process. The finished engine is built to meet or
exceed applicable OEM specifications.
Mazda MZR 2.3L Engine Highlights
- Engine Family: Mazda MZR
- Displacement: 2.3L
- Configuration: Inline 4-cylinder
- Head Type: DOHC
- Valves: 16
- Block Material: Aluminum
- Cylinder Head Material: Aluminum
- Fuel Type: Gasoline
- Block Casting: T5251
- Crank Casting: 3L5G-DA
- Grade Type: Premium
Professional MZR 2.3L Remanufacturing Process
Every Mazda MZR 2.3L remanufactured engine goes through
a detailed remanufacturing process before being prepared for installation.
The process is designed to clean, inspect, machine, rebuild, and test
the engine’s major components.
1. Deep Cleaning
The engine is fully disassembled before the individual components are
thoroughly cleaned. Aluminum components are thermally cleaned, while
applicable cast-iron components are hot tanked to remove accumulated
contaminants and deposits.
2. Inspection and Crack Testing
Components are carefully inspected for wear and potential defects.
Magnaflux testing is used on suitable metal components to identify
microscopic cracks and fissures. Parts also receive visual inspection
before continuing through the remanufacturing process.
3. Machining and New Components
Deck surfaces are CNC machined as required. The rebuilding process
includes new bearings, pistons, rings, lifters, oil pump, gaskets,
Viton valve seals, freeze plugs, and galley plugs. Timing components
are renewed according to the engine configuration.
4. SIM Testing
After assembly, the engine undergoes SIM testing. The cooling and oil
systems are pressurized and the crankshaft is spun at high RPM to help
verify compression and overall build quality.
MZR 2.3L Engine Specifications
| Engine Manufacturer Code |
MZR |
| Engine Type |
MZR |
| Displacement |
2.3L |
| Configuration |
Inline 4-Cylinder |
| Head Type |
DOHC |
| Number of Valves |
16 |
| Block Material |
Aluminum |
| Cylinder Head Material |
Aluminum |
| Fuel Type |
Gasoline |
| Block Casting |
T5251 |
| Crank Casting |
3L5G-DA |
| Inline Head Casting |
L3K9 |
| Cam Casting |
I: 421 Long Tail – E: 441 |
| Grade Type |
Premium |
| Approx. Weight |
275 lbs |
| Dimensions |
36 × 36 × 36 in |
Mazda MZR 2.3L Vehicle Fitment
This MZR 2.3L replacement engine is listed for the
following Mazda applications. Always verify the engine code, model year,
displacement, and existing engine specifications before ordering.
| Year |
Make |
Model |
Engine |
| 2006–2007 |
Mazda |
6 |
L4 2.3L 2260cc |
| 2007–2012 |
Mazda |
CX-7 |
L4 2.3L 2260cc |
| 2007–2013 |
Mazda |
3 |
L4 2.3L 2260cc |
Mazda 2.3L MZR Applications
Mazda 6 2.3L
The supplied fitment data lists the Mazda 6 with the 2.3L
4-cylinder engine for model years 2006–2007.
Mazda CX-7 2.3L
Select 2007–2012 Mazda CX-7 models equipped with the 2.3L
4-cylinder engine are included in the listed applications.
Mazda 3 2.3L
Select 2007–2013 Mazda 3 models with the 2.3L 4-cylinder engine
are included in the supplied fitment information.
How to Identify the Mazda MZR 2.3L Engine
This engine is identified as part of the MZR engine
family. The supplied block casting number is
T5251, while the crank casting is listed as
3L5G-DA.
The supplied inline head casting is L3K9, and the
cam casting information is listed as I: 421 Long Tail –
E: 441.
When replacing an engine, compare the casting numbers and engine
specifications with your original engine whenever possible. Vehicle
fitment should also be confirmed before ordering.
2.3L DOHC 16-Valve MZR Engine Design
This Mazda MZR engine uses a 2.3L inline 4-cylinder configuration
with DOHC cylinder heads and 16 valves. Both the
engine block and cylinder head are identified as aluminum in the
supplied specifications.
The gasoline-powered configuration is designed for the Mazda vehicle
applications listed in the fitment section above.
Looking for a Mazda 2.3L Replacement Engine?
If your Mazda requires a replacement 2.3L 4-cylinder engine, this
Mazda MZR 2.3L remanufactured engine provides a
professionally remanufactured option for the listed applications.
The engine is fully disassembled, cleaned, inspected, machined,
rebuilt, and SIM tested.
Before purchasing, compare your original engine’s identification,
casting information, and vehicle details with the specifications
listed above. If you are unsure about compatibility, contact Mechron
Tech with your vehicle information and engine details for application
verification.
Need Help Confirming MZR 2.3L Fitment?
Not sure whether this Mazda MZR 2.3L replacement engine matches your
vehicle? Contact Mechron Tech with your year, make, model, VIN, and
existing engine information before ordering.
