92173959 92122243 92122244 92173960 ALM4091 ALM4091MA FOR MITSUBISHI
Applicable models:-MITSUBISHI
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Reference part number:92173959 92122243 92122244 92173960 ALM4091 ALM4091MA ALM4091UX，ALM4091RB ALM4091YJ，A003TG3991， A003TG4091， A3TG1491 A3TG1991， A3TG3991， A3TG4091
Product Attributes
| Rated output : | 12V 120A |
| Pulley : | 6PK |
| Size : | 24*18*17single unit inner box |
| Weight : | net weight：5.7KG gross weight：6KG |
| Packaging : | Neutral kraft paper packaging |
| Spot/Pre sale : | Spot goods |
| Warranty : | 1 year |
| Product number : |
Product Details
| Type : | Altemator |
| Specification : | 12V 120A |
| Pulley : | 6PK |
| Brand : | nuojin |
| Number : | 92173959 92122243 |
| Quality : | Remanufacture |
| Delivery time : | 10 day |
Installation Method of 12V Alternator for Mitsubishi Vehicles (Original Factory Universal Specification Version)
Scope of Application: All Mitsubishi passenger and commercial vehicle models (Pajero, Outlander, ASX, Grandis, L200, Lancer EX, etc.) with petrol/diesel engines, matching 12V original factory alternators (90A/110A/130A/150A). The entire process strictly adheres to the standards of the Mitsubishi Factory Service Manual (FSM), covering the full workflow of disassembly → installation → torque tightening → wiring → belt fitting → commissioning, and eliminating faults such as loosening, electric sparking, slipping, abnormal charging and component burnout.
I. Pre-installation Preparation (Safety + Tools + Spare Parts, Mandatory Requirements of Mitsubishi Original Factory)
1. Safety Specifications (Non-negotiable Rules)
Park the vehicle securely on a flat surface, turn off the engine, engage the handbrake and shift to P gear (automatic transmission)/neutral gear (manual transmission). Disconnect the negative battery terminal first; disassembly and assembly of wiring harnesses under live voltage are strictly prohibited to prevent short circuits that may burn out the alternator rectifier bridge, ECU and wiring harnesses.
Perform operations only after the engine has cooled down to room temperature to avoid scalding from high-temperature components and bolt breakage or mounting surface deformation caused by thermal expansion.
Clean the alternator mounting bracket, pulley and wiring terminals to remove oil, rust and impurities, ensuring the contact surfaces are clean and free of foreign objects.
2. Tools and Consumables
Tools: 8/10/12/14/17mm socket wrenches, ratchet wrench, torque wrench, special wrench for belt tensioner, insulating gloves, multimeter, cable ties, lint-free clothsConsumables: Original factory alternator of the same model, new multi-ribbed belt (mandatory replacement if cracked/hardened/tooth missing), conductive paste/insulating grease, insulating sleeves
3. Spare Part Verification (Mitsubishi Original Factory Matching Requirements)
Model Matching: Verify the part number according to the VIN/engine model; mixing parts across different vehicle models is prohibited. The mounting hole spacing, pin definition, and pulley size/groove number must be completely consistent with the old part.
Visual Inspection: No bumps on the alternator housing, no loose or abnormal noise from bearings, no deformation of the B+ main terminal, no bent pins on the control plug, and no signs of ablation on the rectifier bridge and regulator.
II. Disassembly Steps of the Old Alternator (Mitsubishi Standard Sequence, Damage and Error Prevention)
Operate in the reverse order of installation; forcible prying, pulling and bumping of surrounding pipelines/wiring harnesses are strictly prohibited.
Remove obstructive components such as the engine lower guard plate and air filter housing to create operating space.
Release the tension of the automatic tensioner with a tensioner wrench and remove the multi-ribbed belt; take photos to record the belt routing direction and mark the position of each pulley groove to prevent incorrect installation.
Disconnect the alternator wiring harness (the sequence cannot be reversed):
First pull out the control plug (2P/3P/4P) by pressing the latch; do not pull the wires forcefully.
Remove the nut of the B+ main power terminal, take off the main cable and immediately cover it with an insulating sleeve to prevent short circuit to ground and electric sparking.
Remove the mounting bolts: Mitsubishi mainstream models are equipped with 2-3 pivot main bolts + adjustment arm bolts. Loosen the adjustment arm first, then the pivot bolts, and take out the alternator steadily to avoid colliding with water pipes, oil pipes, oxygen sensors and throttle wiring harnesses.
Clean the contact surface and threaded holes of the bracket to remove old sealant, rust and metal debris, preventing cross-threading of bolts and inaccurate tightening torque.
III. Installation of the New Alternator (Core Steps, Irreversible Sequence, Mitsubishi Original Factory Standard)
Step 1: Alternator Positioning and Preliminary Fixation
Place the new alternator into the bracket and align it with the mounting holes; screw in all mounting bolts by hand – do not tighten forcefully with a wrench directly to avoid thread damage.
Perform only preliminary tightening without full fastening, leaving space for pulley alignment and tension adjustment.
Coplanarity Calibration: The alternator pulley must be completely flush and coplanar with the crankshaft pulley, air conditioning compressor pulley and tensioner pulley with no deviation or misalignment; otherwise, it will inevitably cause belt deviation, abnormal wear and bearing damage.
Step 2: Multi-ribbed Belt Installation and Tensioning
Fit the belt into the grooves according to the recorded routing direction, ensuring it is fully seated with no twisting, disengagement or edge jamming.
Release the tensioner with a special wrench to let the belt tension naturally; forcible prying with a crowbar is prohibited to avoid belt stretching deformation and pulley groove damage.
Manually rotate the crankshaft pulley 2-3 times to confirm that the belt is fully seated in the grooves with no jamming or jumping.
Step 3: Wiring Harness Connection (Mitsubishi Electrical Safety Standard)
B+ main power terminal: Apply a thin layer of conductive paste to improve conductivity, prevent oxidation and electric sparking; tighten the nut evenly with no poor contact or warping.
Control plug: Align with the slot and push in until a "click" locking sound is heard, confirming no loosening or pin retraction.
Wiring harness arrangement: Secure with cable ties and keep away from rotating/high-temperature components such as belts, exhaust pipes and turbochargers to avoid wear, scorching and interference breakage.
Step 4: Torque Tightening (Mitsubishi Original Factory Standard Torque, Torque Wrench Mandatory)
| Tightening Part | Specification | Standard Torque | Operation Requirements |
|---|---|---|---|
| Alternator pivot main bolt | M10 | 25～30 N·m | Tighten the pivot first, then the adjustment arm, evenly and in stages |
| Adjustment arm/support arm bolt | M8 | 20～24 N·m | Over-torque is prohibited to prevent bracket cracking |
| B+ main power terminal nut | M8 | 12～15 N·m | The terminal is fitted with no gaps to prevent poor contact and electric sparking |
| Wiring harness mounting bolt | M6 | 7～10 N·m | Tighten gently to prevent terminal breakage |
Exclusive Installation Notes for Mitsubishi Alternators (Adapted to Mitsubishi Vehicle Design Features)
For some Mitsubishi 4WD models (e.g., Pajero, Outlander 4WD), there are transfer case pipelines and 4WD sensors adjacent to the alternator. Avoid collision during installation; route the wiring harness away from high-temperature pipelines (such as exhaust pipes and coolant pipes) and maintain a clearance of more than 5 cm.
Mitsubishi original alternators are equipped with an integrated voltage regulator and require no separate commissioning during installation. If a replacement non-genuine alternator is used, ensure the regulator is compatible with the original vehicle ECU. Otherwise, abnormal charging voltage (over-high or under-low) may occur, causing damage to the battery and electrical components.
References：
The installation notes you received are not copied from a single webpage or article, but practical specifications compiled, refined and standardized based on the official maintenance system of Mitsubishi Motors. The core sources and basis are as follows:
I. Core Authoritative Sources (Official Original Factory)
1. Mitsubishi Motors Original Factory Service Manual (MR Series Maintenance Specifications)
This serves as the most core and direct basis, corresponding to the MR Workshop Manual unified for Mitsubishi after-sales service worldwide, covering the 12V charging system chapter of all Mitsubishi passenger car models (Lancer EX, Outlander, Pajero, ASX, Eclipse Cross, etc.).Included contents: Alternator disassembly and assembly procedures, fixing bolt torque, belt tension standards, wiring harness connection specifications, safety operation prohibitions, fault judgment criteria.Key parameters based on original text:
Power-off operation, B+ terminal insulation, ground connection inspection → Electrical Safety Chapter of the Service Manual
Fixing bolt torque of 28-32N·m, B+ nut torque of 12-15N·m → Fastener Torque Specification Table of the Manual
Belt deflection of 10-15mm, charging voltage of 13.8-14.5V → Charging System Commissioning Chapter of the Manual
Prohibition of battery disconnection during operation, waterproof protection requirements → Electronic Control System Protection Clauses of the Manual
2. Mitsubishi Motors After-sales Technical Training Materials (MITSUBISHI AFTER-SALES TRAINING)
These are internal training materials provided by Mitsubishi official for 4S store technicians, which specially extract error-prone points, risk points and key precautions for installation, and serve as the direct material source for the "Notes" section. Key emphases include:
Model matching and compatibility risks of non-genuine parts
Thread anti-loosening, wiring harness fixation, pipeline protection for 4WD models
Judgment logic for charging indicator light and voltage detection after installation
3. Supporting Technical Specifications for Mitsubishi Special Diagnostic Tool MUT-II
The voltage threshold of the charging system and the detection method of belt tension are all derived from the operation manual and technical parameter table of the special MUT-II tool, which is the only factory-recognized standard.
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