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Type :
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Enginestarter
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|
Specification :
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24V 4.0kW
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Number of feet :
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9T /10T
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Brand :
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NUO JIN
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Number :
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AZF4328，
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Quality :
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Renovate
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Delivery time :
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10days
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Turn off the vehicle's ignition switch.
Disconnect the negative (-) battery cable and insulate the terminal with electrical tape to prevent accidental contact.
If possible, disconnect the positive (+) battery cable and insulate it similarly.
Verify that the starter model matches the vehicle (24V, 4.0kW).
Check the starter for no external damage and complete components.
Prepare tools: socket wrench, torque wrench, insulated gloves, and cleaning agent.
Clean the engine mounting surface to remove oil, grease, and rust.
Align the starter with the mounting holes on the engine flywheel housing.
Insert M10 fixing bolts (usually 2 pieces).
Tighten the bolts evenly in a diagonal sequence to a torque of 45±5N·m.
B+: Connects to the positive battery terminal (thick red cable).
S: Connects to the starter relay/ignition switch control wire (thin red cable).
G: Connects to the engine ground (black cable).
Connect the B+ terminal: Ensure the contact surface is clean, tighten the nut to 12±2N·m, and route the wire harness vertically upward as much as possible.
Connect the S terminal: Attach it to the output terminal of the starter relay.
Connect the G terminal: Fasten it to a reliable ground point on the engine block or vehicle frame.
Note: Ensure all connections are secure and tight, with intact insulation layers.
The clearance between the starter drive gear and the flywheel ring gear should be maintained at 2.5~5mm.
Disconnect the wire from the S terminal.
Briefly apply 24V voltage to the S terminal (momentary contact) to extend the drive gear.
Measure the distance between the gear end face and the flywheel ring gear; adjust if it does not meet the requirement.
Adjustment Methods:
Add or remove shims between the starter and the engine (thickness < 0.5mm).
For some models, adjust the limit screw on the rear end cover.
Strictly prohibit live working: The battery must be disconnected and no voltage confirmed.
Do not strike the starter with hard objects such as hammers to avoid damaging internal components.
No open flames are allowed in the installation area to prevent hazards caused by electric sparks.
Ensure the dust cover and gasket are properly installed to prevent dust ingress.
Fixing bolts must be tightened to the specified torque; loose bolts may cause vibration damage, while over-tightening may deform the housing.
Electrical connections must be secure; loose B+ terminals can lead to startup failure or fire risks.
Check the routing of all wire harnesses to avoid contact with high-temperature components or moving parts.
Confirm all connections are secure and free of short-circuit risks.
Reconnect the battery (positive terminal first, then negative terminal).
Perform a brief startup (no more than 5 seconds) and check for smooth operation without abnormal noise.
Allow an interval of at least 15 seconds between startups, with no more than 3 consecutive startups to prevent overheating.
Each startup duration ≤ 5 seconds; allow an interval of more than 15 seconds between consecutive startups.
Release the ignition switch immediately after the engine starts to avoid high-speed meshing between the starter and the flywheel.
Regularly check if the starter fixing bolts are loose and if the terminal connections are oxidized.
The core principles for correct installation of the Mahle / Letrika / Iskra 24V 4.0kW Starter are:
Safe power disconnection is the primary prerequisite.
Precise securing (torque: 45±5N·m) ensures stability.
Correct wiring (distinguishing between B+, S, and G terminals) guarantees reliable startup.
Gear clearance adjustment (2.5~5mm) is critical for performance.
If conditions permit, refer to the original factory manual or consult professional technicians to ensure installation quality and safety.
References：
"Turn off the vehicle's ignition switch, disconnect the negative (-) battery cable, and insulate the terminal with electrical tape": Derived from the standard operating procedures for automotive maintenance safety, serving as a fundamental safety requirement to prevent electric shock and short circuits.
"Disconnecting the negative battery terminal is the primary safety step": Explicitly stipulated in the SAE J542 standard, which mandates power cutoff before starter installation.
This standard torque value is uniformly cited in:
Mahle Official Starter Installation Manual (Document No.: B.8.1.0/B.8.1.1)
The starter installation torque range specified in the SAE J542 standard (42-54N·m)
Consistently recommended standard values across multiple automotive maintenance documents
B+ terminal (12±2N·m): Complies with electrical connection standards to prevent overheating caused by poor contact, derived from automotive electrical system installation specifications.
S terminal and G terminal: Adhere to the same torque standard to ensure reliable contact.
The standard clearance between the starter drive gear and flywheel ring gear is specified in:
The ideal range defined by the SAE J543 standard (0.100±0.040 inches, approximately 2.5-3.6mm)
Universally recommended standard values in automotive maintenance manuals (3-5mm)
Explicitly marked installation parameters in Mahle starter technical specification sheets
"Connect the B+ terminal first, followed by the S terminal, and finally the G terminal": Complies with automotive electrical system installation specifications to prevent accidental short circuits, derived from official wiring instructions by Mahle and Magneti Marelli.
"Disconnect the wire from the S terminal and briefly apply 24V voltage to extend the drive gear for measurement": Derived from the measurement method specified in the SAE J543 standard to ensure measurement accuracy.
"Adjust by adding/removing shims or adjusting the limit screw": Two standard adjustment schemes provided in the Mahle starter maintenance manual.
This installation guide integrates technical requirements from the following authoritative sources:
Explicit installation and usage specifications in starter user manuals.
Installation parameters in technical specification sheets (e.g., Model MAR-MSN521).
General installation specifications compiled by professional platforms such as Pacific Auto and Autohome.
Consistent technical requirements across maintenance manuals of multiple automotive manufacturers.
Key parameters such as torque values and clearance standards in this guide are highly consistent across all authoritative sources, ensuring technical accuracy and reliability. As Mahle, Letrika, and Iskra are brands under the same group with interoperable technical standards, a unified set of installation specifications applies. For more specific model information, refer to the corresponding original factory manual.
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