Spark Plug 4955850/4937472/5473010 for Cummins C8.3 ISB5.9G ISC8.3 ISL L9N QSL9 Gas Engines

Product Specifications

Compatible Models

Frustrated by Misfiring Gas Engines? Get the Right Cummins Spark Plug for ISB5.9G, QSL9, and L9N CM2380

Gas-powered construction equipment—especially Cummins ISB5.9G, QSL9, and L9N CM2380 engines—relies on precise ignition timing. A single faulty spark plug causes rough idling, power loss, or complete shutdown. We’ve seen fleet operators lose $2,800+ per day in idle time waiting for OEM parts—or worse, installing counterfeit plugs that fail within 200 operating hours.

OEM-Equivalent Quality, Ready to Ship from Guangzhou Warehouse

This Cummins spark plug meets OEM dimensional and electrical specifications and is manufactured in ISO-certified factories. With 10 years of global export experience and 10,000+ SKUs in stock—including 4955850, 4937472, and 5473010—we test every batch for heat range consistency, electrode gap tolerance (±0.02 mm), and dielectric strength before shipment. It’s engineered for real-world gas engine repair: excavation site generators, landfill compressors, and municipal refuse trucks running continuous duty cycles.

Where This Part Works

These spark plugs operate under high-temperature, high-vibration conditions typical in construction, mining, port logistics, and waste management fleets. In Cummins L9N CM2380 natural gas engines powering heavy-duty haulers, they withstand cylinder pressures up to 120 bar and combustion temperatures exceeding 2,200°C. Selecting the correct spark plug—like the 5473010 spark plug—is critical to maintaining stoichiometric air-fuel ratios and preventing pre-ignition damage to pistons and valves.

Engineering Details That Matter

The center electrode uses iridium-tipped nickel alloy for extended service life and stable arc initiation at low cranking voltage. The insulator is high-purity alumina ceramic (95% Al₂O₃), rated for thermal shock resistance up to 750°C/min ramp rate. Thread pitch and hex size match OEM tolerances (M14×1.25, 16mm hex) ensuring proper torque seating without gasket distortion. The ground electrode geometry is optimized for flame kernel propagation in lean-burn natural gas combustion chambers—critical for ISL G and QSL9 gas engine efficiency. Surface finish complies with ISO 4287 Ra ≤ 0.8 µm to prevent carbon tracking.

The Real Cost of Wrong Parts

A $12 counterfeit spark plug may seem economical—until it triggers misfire codes, forces ECU derating, and leads to catalytic converter overheating. Industry data shows non-OEM-equivalent plugs increase unplanned downtime by 3.2x and raise total cost of ownership (TCO) by 210% over 12 months due to labor rework, secondary component damage, and fuel inefficiency. Using certified aftermarket parts like this Cummins ISB5.9G spark plug ensures compliance with ISO 15500-3 for compressed natural gas (CNG) ignition systems—and avoids voiding OEM emissions warranties.

Why Customers Trust XUNPO

Packaging & Shipping

• Individually sealed in branded retail box with molded EVA foam insert and anti-static lining
• In-stock items ship within 2–5 working days after payment confirmation
• Flexible logistics: DHL/FedEx/UPS express (3–7 days), air freight (7–12 days), or sea freight (25–40 days)
• Real-time tracking provided from warehouse dispatch to final delivery
• MOQ is 1 piece—designed for urgent maintenance needs on active job sites

Get Your Cummins Spark Plugs Now

Your excavator or refuse truck isn’t generating revenue while waiting for parts. Send us your machine model (e.g., “Cummins L9N CM2380”), quantity, and destination—we’ll reply with a competitive quote within 24 hours. First-time buyers can request sample testing to validate performance before bulk order. Every hour delayed costs your operation money; act now.

Frequently Asked Questions