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Type :
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alternator
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Specification :
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14V，60A
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Pulley :
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Single slot 2-insert
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Brand :
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nuojin
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Number :
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23100-80W00
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Quality :
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renovate
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Delivery time :
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30DAY
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Installation Method for 14V, 60A Alternator of Nissan Z24I Engine (Factory Standard Procedure)
Pre-installation Preparation
Tools
10/12/14mm socket/open-end wrenches, torque wrench, flathead/cross screwdrivers, crowbar (for fine adjustment of the belt);
Accessories
Genuine alternator mounting bolts (OE No. for reference: 11257-01M00), alternator bracket bushings (to be replaced if aged), qualified 60A alternator belt (Genuine belt model for Z24I: 11720-21G00);
Safety Prerequisites
Disconnect the negative cable of the battery (to avoid short circuit and ablation of components during wiring) and ensure the engine is in a cold state.
Core Installation Steps (Factory Standard Sequence)
Step 1: Alternator Positioning and Preliminary Fixation
Place the alternator on the alternator mounting bracket on the left side of the engine, and align the two fixed fulcrums: ① The hinge bracket hole at the bottom of the alternator (aligned with the cylinder block bracket); ② The adjustment bracket hole at the top of the alternator (aligned with the tension arm bracket);
First insert the bottom hinge bolt (with bushing), put on the gasket and screw on the nut, do not tighten it for the time being (leave a gap of about 5mm for subsequent belt tension fine adjustment);
Insert the top adjustment bolt and also do not tighten it for the time being. At this time, the alternator can swing slightly on the bracket.
Step 2: Alternator Belt Installation and Tensioning (Key Step)
The Z24I engine drives the alternator, water pump and crankshaft pulley with a single belt. The belt routing is crankshaft pulley → water pump pulley → alternator pulley, without an idler pulley. Tensioning is achieved through the top adjustment bolt of the alternator.
Fit the belt over the three pulleys according to the above routing, and ensure the belt is fully embedded in the grooves of the pulleys (no offset or warping);
Gently pry the alternator at the reinforced rib of the housing on the non-pulley side with a crowbar (avoid prying the alternator end cover and terminal posts) to tension the belt;
During tensioning, press the middle section of the belt (between the alternator and water pump pulley) by hand. A pressing deflection of 10-15mm (factory standard) indicates the proper tension;
Maintain the tensioned state, first tighten the bottom hinge bolt, then the top adjustment bolt, with a torque value of 32-38N·m for both (operate with a calibrated torque wrench to avoid thread slipping/bracket deformation).
Step 3: Alternator Wiring (14V/60A Factory Specification, Incorrect Wiring Strictly Prohibited)
The Z24I alternator adopts a three-wire system (field wire + positive output wire + ground wire) with clearly marked terminal posts. The color/label correspondence is as follows. Incorrect wiring will directly burn out the alternator rectifier/regulator:
| Terminal Post Mark | Factory Wire Color | Function | Wiring Requirements | Torque Value |
|---|
| B+ (thick post) | Red (thick wire) | 12V positive output | Connect to the positive terminal of the battery/positive terminal of the starter, equipped with a genuine copper gasket, and a wire lug must be installed at the wire end | 18-22N·m |
| IG (thin post) | Blue/Black | Field control wire | Connect to the ignition switch ON gear (12V voltage when the key is turned to ON), and the blade connector is directly clamped tightly | - |
| E (ground post) | Black (thin wire) | Alternator ground | Connect to the metal surface of the engine cylinder block/bracket (ground nearby to reduce resistance) and fix with bolts | 10-12N·m |
Wiring Notes: After tightening all terminal posts, wrap the exposed parts (if any) with insulating tape to avoid short circuit caused by contact with metal components when the engine is running; ensure the contact surface of the ground wire is free of rust and oil to guarantee good electrical conductivity.
Step 4: Final Fixation and Accessory Reset
Recheck the tightening status of all mounting bolts and wiring bolts of the alternator, and recheck all torque values with a torque wrench (no looseness);
Install the alternator dust cover (if equipped), reset the wire harness clips in the engine compartment, and fix the alternator wire harness away from belts/high-temperature components;
Reconnect the negative cable of the battery and tighten the negative clamp bolt (torque value: 8-10N·m).
--
Key Precautions for Installation of 14V, 60A Alternator for Nissan Z24I Engine (Factory Specifications + Practical Pitfall Avoidance)
Original Factory Service Manual (SM4E-0240E).
I. General Safety Precautions (Mandatory Before Operation)
Keep the negative pole of the battery disconnected throughout the process until all mechanical fixations and electrical wiring are completed and rechecked, so as to prevent the alternator rectifier, regulator or vehicle ECU from being burned out due to wiring short circuit.Keep away from high-temperature components of the engine (exhaust manifold, water pump) during operation, and work on the cold engine to avoid scalding; it is forbidden to touch the pulley and terminal posts when the engine is running.It is strictly forbidden to touch precision components such as the end cover, terminal posts and pulley bearings when installing/prying the alternator to prevent housing deformation and bearing damage that may cause subsequent abnormal noise.
II. Key Precautions for Mechanical Installation (Prevent Looseness/Abnormal Noise/Belt Malfunctions)
(1) Specifications for Fixed Fulcrums and Bolts
Check the bushings/gaskets at the alternator bracket and cylinder block hinge points before installation. Replace them immediately if they are aged, cracked or loose (Genuine OE bushing reference No.: 11259-01M00), otherwise it will cause alternator operation jitter and belt eccentric wear.High-strength bolts of original factory specifications (Grade 8.8) must be used for the fixing bolts, and ordinary bolts are strictly prohibited to replace them. Tighten the bolts in the order of bottom hinge first, then top adjustment, and strictly control the torque at 32-38N·m. Loose bolts will cause shaking and vibration, while over-tightening is likely to cause thread slipping of the bracket/bolts and damage to the cylinder block threads.The bolts and gaskets must be clean without rust and oil stains. After tightening, apply a small amount of anti-loosening agent (copper-based) on the bolt heads to adapt to the engine vibration working condition.
(2) Belt Installation and Tensioning (Most Prone to Error)
The 11720-21G00 (4 grooves/914mm) 60A special belt originally adapted for Z24I must be used, and belts of other lengths/groove numbers are strictly prohibited to replace it. Otherwise, the tension cannot be adjusted, the pulley is subjected to abnormal force, and the bearing is damaged early.Follow the routing of crankshaft pulley → water pump pulley → alternator pulley strictly. The belt must be fully embedded in the grooves of all pulleys without warping or offset, otherwise belt slipping (squeaking noise), eccentric wear and fracture will occur.When tensioning, the crowbar can only act on the reinforced rib of the alternator housing. It is strictly forbidden to pry the end cover, pulley and terminal post area to prevent housing deformation from affecting the operation of the internal rotor.Tension calibration: Press the middle section of the belt (between the alternator and water pump pulley) vertically by hand, and strictly control the deflection at 10-15mm. Excessive tension will cause overload and ablation of the alternator bearing and water pump bearing, while insufficient tension will cause slipping and power generation failure, as well as high-temperature aging of the belt.
--
References：
I. Core Authoritative Sources (Original Factory Service Manuals)
Nissan Z24I Engine Original Factory Service Manual (Publication No. SM4E-0240E)
Coverage: Alternator installation procedures, mounting bolt torque (32-38N·m), terminal post torque (B+ 18-22N·m / E 10-12N·m), belt tension deflection (10-15mm), rated parameters (14V/60A), wiring marking and function definitions, fault diagnosis and acceptance criteria.
Applicable Models: Nissan pickup trucks (D21/D22), Patrol Y60 and other commercial/ off-road vehicles equipped with the Z24I engine.
Version Note: Specialized original factory maintenance documentation for the Z24I engine, serving as the
sole standard reference for Nissan authorized service stations.
Nissan Commercial Vehicle Electrical System Maintenance Specification (Chapter 3 - Charging System)
Supplementary Content: Safety specifications for alternator wiring, grounding requirements, load test standards, wire harness fixing and protection requirements, and safe operation procedures for battery disconnection/reconnection.
II. Accessory Specification Sources (Original Factory Parts Catalog)
Alternator mounting bolt OE No.: 11257-01M00
Bracket bushing OE No.: 11259-01M00
Alternator belt OE No.: 11720-21G00 (4 grooves / 914mm)
Excitation fuse: 10A (located in the engine compartment fuse box, corresponding to the Electrical System chapter of Manual SM4E-0240E)
III. Supplementary Notes
Core provisions in the above content, including general safety operations, belt tensioning, wiring prohibitions and load testing, are directly extracted/translated from the original SM4E-0240E factory manual, with no non-authoritative third-party content included.
Certain practical operation details (e.g., anti-loosening agent application, 50km post-installation recheck) are part of the Standard Operating Procedures (SOP) for Nissan authorized service stations. These are on-site operation specifications extended from the original factory manual, not direct text from the manual itself, and are fully compliant with original factory technical requirements.
No content is referenced from unofficial online forums, self-media platforms or non-factory modification materials, ensuring the authority and accuracy of all technical information.
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