The Perkins 4012-46TAG0A is a 45.842-litre V12 diesel engine for high-output 1500 rpm / 50 Hz generator sets. Its published ratings are 1250 kVA prime and 1375 kVA standby, corresponding to 1000 kWe and 1100 kWe at a stated power factor of 0.8.
This model belongs to the heavy-duty Perkins generator-drive engine range and is supplied around an Electro unit or ElectropaK configuration. It uses turbocharging, air-to-air charge cooling, individual four-valve cylinder heads and unit fuel injectors. Correct selection requires confirmation of the complete DGL/DGLM Build List, ESN, cooling package, governor and actuator arrangement, package scope and destination requirements.
Start with the 1250–1375 kVA Rating Boundary
The 4012-46TAG0A has separate prime and standby ratings at 1500 rpm. These ratings describe different operating duties and should not be treated as interchangeable output labels.
| Duty | Gross Engine Power | Net Engine Power | Generator Output | Electrical Output |
|---|---|---|---|---|
| Prime | 1125 kW (1509 hp) | 1053 kW (1412 hp) | 1250 kVA | 1000 kWe |
| Standby | 1230 kW (1649 hp) | 1158 kW (1552 hp) | 1375 kVA | 1100 kWe |
Prime and Standby Describe Different Operating Profiles
The 1250 kVA prime rating applies to the approved variable-load or regular operating profile of the complete generator set. The 1375 kVA standby rating is the higher emergency-power level and remains subject to the operating-hour and loading limits of the applicable standby classification.
A project expecting frequent generator operation should not be sized only from the 1375 kVA standby figure. Annual operating hours, expected load variation, redundancy requirements and the largest load steps should be defined before the engine and alternator are selected.
A Dedicated 1500 rpm / 50 Hz Engine
The supplied product information identifies the 4012-46TAG0A exclusively as a 1500 rpm configuration. No approved 1800 rpm / 60 Hz rating is provided for this model.
A 60 Hz project therefore requires a separately documented engine platform. The governed speed should not be changed in the field in an attempt to convert this engine to another frequency.
| Frequency Decision | Requirement |
|---|---|
| 50 Hz Project | Use the approved 1500 rpm DGL/DGLM configuration |
| 60 Hz Project | Select a separately documented 1800 rpm engine |
| Existing Engine Replacement | Confirm rated speed from the engine nameplate and genset documentation |
| Frequency Conversion | Do not approve from the model name or advertised kVA alone |
Build Lists DGLM6235S, DGLM0106S and DGLM1571S
The principal original Build List designations are DGLM6235S, DGLM0106S and DGLM1571S. The supplied information identifies them as Perkins designations assigned in 2008 for the same stated 4012-46TAG0A engine specification.
DGL6235S, DGL0106S and DGL1571S are the corresponding shortened designations used for engines from later production batches.
| Build List Group | Identification | Page Rating |
|---|---|---|
| DGLM6235S / DGLM0106S / DGLM1571S | Original Perkins designations | 1250 kVA prime / 1375 kVA standby at 1500 rpm |
| DGL6235S / DGL0106S / DGL1571S | Updated shortened designations for later batches | Same stated engine specification |
The source treats the original and updated designations as equivalent for the stated specification and parts compatibility. The complete Engine Serial Number is still required because it identifies the production record, installed equipment and component revisions of the individual engine.
Information to Record from the Engine Nameplate
- Complete model: 4012-46TAG0A
- Complete Build List beginning with DGL or DGLM
- Complete Engine Serial Number
- Rated speed: 1500 rpm
- Cooling configuration: tropical or temperate when known
- Governor and actuator arrangement
- Original generator-set manufacturer and model
The nameplate is normally mounted on the rocker-cover or timing-case area. A clear photograph of the entire plate is preferable to a manually copied Build List or serial number.
The Build List Defines More Than the Power Rating
The Build List and ESN are used together to confirm the cooling package, governor and actuator arrangement and factory-installed equipment. Two engines carrying the same base model name should not be assumed to have identical peripheral equipment.
| Configuration Area | Why Build Verification Matters |
|---|---|
| Cooling Package | Temperate and tropical versions may use different radiators, fans and package dimensions |
| Governor and Actuator | Control hardware and interfaces must match the original generator-set control system |
| Factory-Fitted Equipment | Filters, brackets, sensors, harnesses and accessories may vary by build |
| Replacement Parts | Part-number alternatives must be resolved against the complete ESN |
| Replacement Engine | Mounting, cooling, exhaust and control interfaces must be compared with the existing unit |
Electronic Governor and Actuator Without an Engine-Mounted ECM
The supplied technical specification identifies electronic governor and actuator control but states that there is no engine-mounted ECM. This control architecture requires particular attention during generator-set integration.
The genset builder should not assume that the engine contains a complete engine-mounted electronic control module with all start, stop, protection and communication functions. The governor, actuator, speed sensing, shutdown circuits and generator-set controller interfaces must be reviewed as a complete system.
| Control Interface | Integration Check |
|---|---|
| Governor | Confirm governor model, power supply and speed-control interface |
| Actuator | Confirm actuator type, linkage, response and supplied harness |
| Speed Signal | Confirm magnetic pickup or applicable speed-sensing arrangement |
| Start and Stop Logic | Confirm how the genset controller commands starting and shutdown |
| Engine Protection | Confirm oil-pressure, coolant-temperature, overspeed and emergency-stop circuits |
| Parallel Operation | Confirm load-sharing and synchronization interfaces with the governor system |
| Customer Wiring | Obtain the wiring diagram for the exact Build List and package scope |
Electro Unit and ElectropaK Are Different Commercial Scopes
The specification lists Electro unit / ElectropaK configurations, while the introductory product information positions the engine as an ElectropaK supply. The exact package scope should therefore be stated in the quotation rather than inferred from the model name.
| Package Description | Scope to Confirm |
|---|---|
| Electro Unit | Included engine accessories, cooling exclusions and applicable dimensional drawing |
| ElectropaK | Radiator, fan system, filtration, controls, mounts and included engine equipment |
| Complete Generator Set | Alternator, controller, base frame, breaker, enclosure and fuel system |
| Replacement Engine Package | Compatibility with the existing radiator, base, coupling, exhaust and control panel |
Package descriptions should be accompanied by a written inclusion list. A buyer should not assume that the alternator, base frame, circuit breaker, enclosure or external fuel system is included with an ElectropaK.
Tropical and Temperate Cooling Packages
The source identifies tropical and temperate cooling configurations. Their dimensions and weight should not be presented as identical.
The stated tropical-package dimensions are 2269 × 3915 × 2200 mm, with a stated dry weight of 5690 kg. Temperate-package dimensions and weight are not confirmed in the supplied information.
| Cooling Version | Dimensions (H × L × W) | Dry Weight | Data Status |
|---|---|---|---|
| Tropical Version | 2269 × 3915 × 2200 mm | 5690 kg | Provided in the source page |
| Temperate Version | To be confirmed | To be confirmed | Not supplied in the source page |
The tropical dimensions should not be applied automatically to a temperate unit. Confirm the complete Build List and obtain the corresponding general-arrangement drawing before foundation, enclosure or transport planning is finalised.
Cooling-System Information Required for Project Release
- Tropical or temperate package selection
- Maximum site ambient temperature
- Site altitude and expected derating
- Radiator model and fan-drive arrangement
- Cooling-air inlet and hot-air discharge route
- Permitted enclosure pressure restriction
- Coolant specification and expansion arrangement
- Service access to radiator, hoses and water pumps
V12 Mechanical Platform
The 4012-46TAG0A uses a 12-cylinder, 60-degree vee architecture with a displacement of 45.842 litres. At this scale, foundation loading, lifting access, engine-room ventilation and long-term service access must be treated as primary design inputs.
| Mechanical Parameter | Specification |
|---|---|
| Model | 4012-46TAG0A |
| Configuration | Electro unit / ElectropaK |
| Cylinder Arrangement | 12 cylinders, 60° vee |
| Displacement | 45.842 L (2979 in³) |
| Bore × Stroke | 160 × 190 mm (6.3 × 7.5 in) |
| Aspiration | Turbocharged, air-to-air charge cooled |
| Combustion System | Direct injection |
| Compression Ratio | 12.8:1 |
| Rotation Viewed from Flywheel | Anti-clockwise |
| Control System | Electronic governor and actuator; no engine-mounted ECM |
| Cooling System | Water cooled |
| Total Lubricating-Oil Capacity | 157.5 L (41.6 US gal) |
| Total Coolant Capacity | 223 L (58.9 US gal) |
| Exhaust Aftertreatment | N/A in the supplied specification |
Installation Decisions for a 1.375 MVA-Class Package
A V12 generator-drive package requires more than checking whether the engine fits between the walls of the generator room. The complete service and removal route should be reviewed before the foundation and enclosure are released.
| Installation Area | Information to Confirm |
|---|---|
| Foundation | Static load, dynamic considerations, mounting arrangement and levelling |
| Access Route | Door width, roof access, crane capacity and future engine-removal path |
| Alternator Integration | Alternator frame, coupling, alignment, power factor and package rating |
| Cooling Air | Radiator airflow, inlet area, discharge ducting and recirculation risk |
| Exhaust | Pipe size, support, thermal expansion and permissible back pressure |
| Fuel System | Day tank, transfer system, return routing, filtration and fuel quality |
| Electrical Control | Governor, actuator, sensors, shutdown circuits and panel interface |
| Maintenance Access | Clearance around cylinder heads, injectors, filters, pumps and manifolds |
Individual Four-Valve Cylinder Heads
Each cylinder uses an individual four-valve cylinder head. This arrangement supports gas flow and allows cylinder-level head work without treating the entire V12 engine as a single cylinder-head assembly.
The wider Perkins 4000 Series shares design principles and certain component families, but this should not be interpreted as universal interchangeability between 4006, 4008, 4012 and 4016 engines. Every part must still be checked against the exact engine record.
Unit Fuel Injectors and Build-Specific Parts
Unit fuel injectors support fuel atomisation and controlled combustion. The injector reference listed for the DGL/DGLM6235S family is 858/35.
Injectors, pistons, valves, connecting rods, manifolds and filtration components should not be selected from the general “4012” description. Final part numbers should be released only after the complete Build List and ESN have been verified.
Service Planning and Fluid Capacity
The source states a 500-hour oil and fuel service interval. The applicable Perkins Operation and Maintenance Manual should still be used to confirm the precise tasks, fluid specifications and any interval adjustments for the individual engine and its operating environment.
| Service Item | Planning Requirement |
|---|---|
| Stated Oil and Fuel Service Interval | 500 operating hours |
| Lubricating-Oil Capacity | 157.5 L (41.6 US gal) |
| Coolant Capacity | 223 L (58.9 US gal) |
| Oil Specification | Confirm from the manual applicable to the exact DGL/DGLM Build List |
| Fuel-Service Scope | Confirm filters, water separation and site fuel-quality requirements |
| Severe Conditions | Review dust, high ambient temperature, fuel quality and prolonged low-load operation |
| Waste-Fluid Handling | Plan collection and disposal around the large oil and coolant volumes |
Exhaust Aftertreatment and Destination Compliance
The technical specification lists exhaust aftertreatment as N/A. This indicates that no aftertreatment system is stated in the supplied configuration.
It should not be interpreted as confirmation that the engine complies with every regional emissions limit. Destination regulations, tender requirements and supporting emissions documentation must be confirmed before quotation or shipment.
Application Review
The 4012-46TAG0A may be evaluated for high-output prime and standby power projects. The project should be assessed through the actual load behaviour rather than only the total connected load.
| Project Type | Key Information to Confirm |
|---|---|
| Industrial Facility | Motor starts, compressor demand, process sequencing and permitted interruption |
| Critical Backup Project | Transfer sequence, priority loads, redundancy and expected standby hours |
| Large Commercial Facility | Lifts, pumps, ventilation, fire systems and priority-load distribution |
| Data or Communications Facility | UPS interaction, cooling demand, staged transfer and redundancy architecture |
| Parallel Generator Plant | Synchronization, protection, governor compatibility and load-sharing strategy |
Parallel Operation Requires Full Control-System Review
Generator sets using the 4012-46TAG0A may be incorporated into a parallel system when the complete packages have compatible controllers, alternators, voltage regulators, protection settings, synchronization equipment and governor interfaces.
Parallel capability is not established by the engine model alone. Load sharing, breaker coordination, maximum load step and synchronization sequence must be validated by the genset integrator.
Original Perkins Replacement Parts
The following references are listed as original Perkins components for the DGL/DGLM6235S Build List family. Additional Perkins engine parts can be reviewed by component category, but final confirmation should be based on the complete ESN.
| Item | Part Name | Part Number |
|---|---|---|
| 1 | Intake and Exhaust Valve | SE7AG/14, SE7AJ/14 |
| 2 | Small End Bush | SE91B/7 or Y01/00023 |
| 3 | Valve Guide | T401899 |
| 4 | Valve Spring | 365/472 |
| 5 | Valve Collet | HW7B/18 |
| 6 | Fuel Filter | SE429B/4 or 4759205 |
| 7 | Exhaust Manifold | 12SE15AA, 12SE15W, 12SE15U, 12SE15Y |
| 8 | Air Filter Assembly | SEV551N |
| 9 | Connecting Rod Assembly | SEV91Q |
| 10 | Big End Bearing Kit | SE91AA/3M |
| 11 | Piston and Ring Kit | SE901BA |
| 12 | Piston Ring Kit | 359/552 |
| 13 | Starter Motor | 701/134 or 701/137 |
| 14 | Alternator Belt | 541/398 |
| 15 | Injector | 858/35 |
| 16 | Oil Pump | 12SE116C |
| 17 | Oil Filter | 4324909 / SE111B |
| 18 | Water Pump Kit | SE145AY / SE145H |
Several component groups contain more than one possible reference. Do not select between alternatives by appearance, dimensions or the generic 4012 model name. Confirm the complete DGL/DGLM Build List and ESN before releasing the final part number and quantity.
Procurement and Export Release
Availability should be confirmed when the inquiry is submitted. The stated lead time is typically 3–4 weeks, and quotations are provided within 24 hours after the configuration, quantity and delivery terms have been defined.
| Procurement Item | Supply Information |
|---|---|
| Supply Source | Genuine Perkins through a first-tier authorised distributor channel |
| Quotation Basis | Build List, ESN, cooling package, supply scope, quantity and delivery terms |
| Quotation Time | Within 24 hours after receiving complete inquiry information |
| Typical Lead Time | 3–4 weeks, subject to availability confirmation |
| Pre-Shipment Verification | ESN and engine nameplate checked before dispatch |
| Engine Test Report | Available on request |
| Export Documents | Commercial invoice, packing list, bill of lading and certificate of origin |
| Shipping | FCL or LCL from Shenzhen, Guangzhou or Shanghai |
| Packaging | Crating and export packaging included |
| Export Experience | Supplied to more than 30 countries |
Warranty and Technical Claim Review
The stated warranty period is 12 months or the manufacturer-specified operating hours from the commissioning date, whichever occurs first. Final coverage should be confirmed against the complete engine serial number, application and applicable warranty terms.
Conditions Outside Warranty Coverage
- Incorrect installation or improper commissioning
- Failure to follow the applicable Perkins Operation and Maintenance Manual
- Normal consumption of filters, belts, coolant and lubricants
- Damage caused by contaminated fuel or an incorrect lubricant specification
- Cooling-system neglect
- Unauthorised modifications or repairs during the warranty period
- Transit damage not reported within three working days of delivery
Information Required for Technical Review
- Complete Build List and ESN
- Current operating hours
- Prime or standby application
- Fault description and operating conditions
- Available fault codes
- Photographs of the affected area
- Relevant commissioning and maintenance records
The stated technical-review time is within two business days after the required evidence has been received. Depending on the assessment, the response may include replacement parts, coordinated repair support or an engine exchange.
Transit Damage Procedure
Inspect the shipment before signing the delivery receipt. Photograph visible damage before unpacking, record it on the receipt and notify the supplier within three working days. Do not commission a visibly damaged engine before the transport-damage report has been reviewed.
Perkins 4012-46TAG0A FAQ
What is the published generator-set rating?
At 1500 rpm, the published ratings are 1250 kVA prime and 1375 kVA standby, corresponding to 1000 kWe and 1100 kWe.
Which Build Lists apply to this page?
The original designations are DGLM6235S, DGLM0106S and DGLM1571S. The corresponding shortened designations are DGL6235S, DGL0106S and DGL1571S.
Can the engine operate at 1800 rpm / 60 Hz?
No approved 1800 rpm / 60 Hz rating is provided. The supplied information identifies the model only as a 1500 rpm / 50 Hz configuration.
Does the engine have an engine-mounted ECM?
The supplied specification states that the engine uses electronic governor and actuator control without an engine-mounted ECM. The external control and protection interfaces must therefore be reviewed with the genset panel.
Which package dimensions are confirmed?
The stated tropical-package dimensions are 2269 × 3915 × 2200 mm with a dry weight of 5690 kg. Temperate-package dimensions and weight are not confirmed in the supplied information.
What is the stated service interval?
The source states a 500-hour oil and fuel service interval. The applicable Perkins manual should define the exact operations and fluid requirements.
Does N/A aftertreatment confirm emissions compliance?
No. It indicates that no exhaust-aftertreatment system is stated in the supplied specification. Destination emissions requirements must still be confirmed.
What information is required for a quotation?
Provide the complete model, Build List, ESN, cooling package, duty, supply scope, genset information, quantity, destination and required documents.
Request a 4012-46TAG0A Configuration Review
Submit the following through the engine inquiry and quotation page:
- Complete DGL or DGLM Build List
- Complete ESN or a clear photograph of the nameplate
- Prime or standby duty requirement
- Confirmation of 1500 rpm / 50 Hz operation
- Tropical or temperate cooling requirement
- Electro unit or ElectropaK supply requirement
- Governor, actuator and control-panel information
- Alternator output, voltage and power factor
- Maximum site temperature and altitude
- Original generator-set manufacturer and model for replacement projects
- Quantity, delivery terms and destination port
- Required emissions, export, test and warranty documentation
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