Product Overview

The IM3144 starter armature (OE IM3144) is a new, OE-spec replacement rotor component built for Nissan starter motors. Rated at 12V 1.7KW, this armature restores dependable cranking torque so your starter engages and turns the engine of your Nissan vehicle reliably.

This aftermarket unit matches the original starter-armature requirements of the Nissan starter family and the IM3144-series cross-reference. It is machined to the factory dimensional spec: overall length 141 mm, outside diameter 54 mm, with 11 splines, 25 commutator segments and ACR rotation. The unit is stocked in-house, backed by a 1-year warranty with a 10-day dispatch lead time. Factory-spec machining guarantees dependable reassembly and start performance for your 12V starter system.

Key physical specs: net weight 1.5 kg, supplied in a neutral kraft inner carton. IM3144 is the alternate workshop type designation for this armature.

Starter Armature For Nissan Applications

Nissan starter motors rely on a correctly matched armature so the starter produces dependable cranking torque and smooth rotation. This armature is engineered to match the original assembly, delivering stable operation after a proper rebuild.

Technical Specifications

Engine Compatibility and Cross Reference

This armature fits Nissan starter motors. Do not rely solely on the vehicle model for fitment validation; always verify the starter model, old-armature OE number, spline count, commutator segment count, rotation and rotor-end diameters before ordering.

Multiple OE numbers exist across different production batches and market specifications for this same armature family. If your original armature carries any one of the listed part numbers and the same dimensional spec, the IM3144-series unit is a direct drop-in replacement.

What to Look for in a Replacement

Follow these six verification steps before placing your order to avoid wrong-part returns:

• 1. Check the rating of the original armature: confirm it is 12V 1.7KW. Different voltage or power ratings are not interchangeable.

• 2. Count the drive splines: this unit has 11 splines. An incorrect spline count will not engage the drive assembly.

• 3. Count the commutator segments: this unit has 25 segments. An incorrect segment count will not match the field assembly and brushes.

• 4. Measure length (141 mm), outside diameter (54 mm), front rotor diameter (10 mm) and rear rotor diameter (9 mm) against your original armature.

• 5. Confirm the rotation direction is ACR for your Nissan starter.

• 6. Weight cross-check: a genuine matching unit weighs about 1.5 kg net; a significant weight difference indicates the wrong assembly or low-grade build quality.

Application Scenarios

• Starter-rebuild and auto-electric workshops refurbishing Nissan starter motors for passenger vehicles across Asia, Europe, Africa, the Middle East, Latin America and North America.

• Auto-electric parts suppliers stocking Nissan starter armatures.

• Parts counters and jobbers servicing starter rebuilds.

• Rebuilders supplying remanufactured starters to fleet operators, dealerships and wholesale parts distributors.

• Maintenance teams restoring starters to factory-standard condition.

Armature Rebuild Procedure

Armature replacement is an internal starter-motor rebuild operation. It must comply with the assembly specifications for low-voltage electrical equipment and the general requirements for engine starting systems. The following is a standardized rebuild procedure, including compatibility inspection and practical precautions, to ensure stable operation after reassembly.

Pre-Inspection and Disassembly

• Power cut protection: Disconnect the starter from the battery and vehicle harness completely before any disassembly work to prevent short circuits.

• Disassembly: Remove the end cover, brush holder assembly and drive-side housing. Take out the old armature, noting the position of washers and thrust spacers.

• Check the old armature nameplate or stamping and record the OE / reference number for cross-referencing.

Cleaning and Workstation Preparation

• Clean the starter housing, field assembly and brush holder of oil, dust and carbon dust. Confirm the field windings are in good condition before fitting the new armature.

• Prepare press tools, a commutator cleaner, a micrometer and rags. Keep the new armature protected from damage and moisture.

Armature Installation and Assembly

• Verify the new armature spline count (11 splines), commutator segment count (25 segments) and rotation direction (ACR) match the drive assembly and brush set before assembly.

• Fit the armature into the starter with the correct thrust washers and spacers, confirming free rotation without binding. Engage the drive assembly onto the splines smoothly.

• Install the brush holder and end cover, seating each brush onto the commutator correctly. Confirm the brushes are not forced or chipped.

Bench Testing and Final Checks

• Conduct a no-load bench test at 12V: the armature should rotate smoothly without abnormal noise, binding or excessive commutator sparking.

• Verify the drive gear expands and retracts properly and the starter produces the expected free-run current and speed.

• Reassemble the starter fully and reinstall it on the engine, then perform an engine cranking test. If cranking is weak, check battery voltage and cable connections.

FAQ

In Practice

For rebuilders working on Nissan starters: before committing to an armature replacement, bench-test the original starter and identify the actual failure mode. Worn brushes, failed field windings, damaged bearings or a faulty solenoid can mimic armature-failure symptoms, so do not replace the armature blindly. Always disconnect the starter from the battery before commencing disassembly.

Photograph and note the position of washers, spacers and terminal connections during disassembly to avoid mis-assembly. Measure the old armature length, diameter, spline count, segment count and rotor-end diameters, and confirm the rotation direction before fitting the new unit. A correct armature match, clean commutator and fully seated brushes are essential for reliable long-term performance.

References

The rebuild method and related precautions are standardized content summarized and integrated based on the universal assembly specifications of Nissan engine starter systems, industry standards for low-voltage starter armature rebuilds of the same specification, and practical experience in the automotive repair field. Equipment applications are compiled from original-equipment fitment data for the IM3144-series starter armature family covering Nissan applications.

About the Author

This article was written by the senior auto-electric technician team at Nuojin Auto Parts, with over 15 years of hands-on experience in automotive charging and starting systems.

Our engineers specialise in Japanese, European, Korean, American and Chinese vehicle charging-system diagnostics, aftermarket alternator and starter-motor cross-referencing, and factory-spec electrical-system restoration for global markets. Every product listing on this site is backed by real bench-tested fitment data and first-hand repair experience, not just copied from manufacturer manuals.

If you have any question about this starter armature or your starter rebuild, contact our technical team and we will help you confirm the correct part for your application.

Nuojin Auto Parts is a professional starter and alternator supplier based in Hejian, Hebei, China, running factory-grade bench testing on every production batch. We support distributors, wholesalers and repair shops worldwide with correct-fit sourcing, a 1-year warranty and responsive after-sales technical assistance.