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

Product Specifications

Compatible Models

Tired of Misfiring Gas Engines? Get the Right Cummins Spark Plug for Your ISB5.9G, QSL9, and L9N Units

Gas-powered Cummins engines in construction, mining, and municipal fleets demand precise ignition — yet downtime from misfires, rough idling, or failed spark plugs costs operators thousands per day. OEM replacements often take 2–4 weeks to arrive, while counterfeit or non-spec spark plugs cause premature electrode erosion, inconsistent combustion, and repeated cylinder deactivation. Matching the correct plug across multiple gas engine variants — ISB5.9G, QSL9, L9N — adds complexity when maintenance windows are tight.

OEM-Equivalent Quality, Ready to Ship

This Cummins spark plug (4955850 / 4937472 / 5473010) is manufactured in ISO 9001-certified facilities used by Tier-1 suppliers for global aftermarket distribution. Every batch undergoes pre-shipment resistance, gap tolerance, and thermal cycling verification to ensure OEM-equivalent performance in high-compression natural gas environments. We’ve supplied over 12,000+ spark plug units to fleet operators across North America and Southeast Asia since 2021 — all verified for direct fitment on Cummins ISB5.9G, ISC8.3 G, ISL G, L9N, and QSL9 gas platforms during scheduled engine tune-ups and emergency repairs.

Where This Part Works

This spark plug operates reliably in heavy-duty applications: landfill compactors running on biogas, municipal refuse trucks using compressed natural gas (CNG), quarry haulers with QSL9 G powertrains, and port-side container handlers powered by ISL G engines. In these environments, consistent spark timing directly affects fuel efficiency, emissions compliance (EPA Tier 4 Final), and cylinder pressure stability under continuous load. A single failed plug can trigger derating or forced idle — making correct specification non-negotiable.

Engineering Details That Matter

The electrode core uses nickel-chromium alloy with laser-welded center electrode geometry — optimized for 30,000+ km service life in lean-burn gas cycles. The insulator body is alumina ceramic (95% Al₂O₃), rated for continuous operation up to 850°C without thermal cracking. Thread pitch and seat angle match OEM specifications (14 mm × 1.25 mm, 19° tapered seat) to prevent gasket blowout or torque-induced shell deformation. Hex size (16 mm) and reach (19.5 mm) ensure full engagement with factory cylinder head threads — critical for heat transfer and sealing integrity in high-hour ISB5.9G and QSL9 installations.

The Real Cost of Wrong Parts

A $3.50 off-brand spark plug may save pennies upfront — but causes uneven combustion, increased NOx emissions, and accelerated valve train wear in Cummins gas engines. Industry data shows incorrect heat range or gap tolerance leads to 68% higher unplanned cylinder head servicing within 6 months. When factoring labor ($120/hr), diagnostic time, and equipment idle cost ($1,800/day for a QSL9-powered wheel loader), the total cost of ownership (TCO) for low-grade plugs exceeds premium aftermarket parts by 4.2× over 12 months. This Cummins spark plug meets SAE J1330 and ISO 15500-4 standards for ignition components — ensuring long-term reliability without OEM price premiums.

Why Customers Trust XUNPO

Packaging & Shipping

• Individually sealed in anti-static blister packaging with printed part number and compatibility label
• In-stock items shipped 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 via email and WhatsApp upon dispatch
• Minimum order quantity: 1 piece — ideal for urgent field repairs or validation testing

Get Your Cummins Spark Plugs Now

Your excavator or refuse truck isn’t generating revenue while waiting for ignition parts. Send us your engine model (e.g., ISB5.9G CM2180), quantity needed, and destination country — we’ll issue a formal quotation within 24 hours. First-time buyers can request one sample unit for physical verification before placing bulk orders. No registration or account setup required.

Frequently Asked Questions