2019 Kenworth T680 Spark Plug Type & Gap
Understanding the ignition system for your diesel Kenworth T680.
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick reference
| Engine | OEM Plug PN | Aftermarket (NGK/Denso/Motorcraft) | Gap (in/mm) | Torque (lb-ft / Nm) | Interval |
|---|---|---|---|---|---|
| PACCAR MX-13 | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) |
| Cummins X15 | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) |
Why the right plug matters
The 2019 Kenworth T680 is a heavy-duty truck designed for long-haul transportation. As such, it is equipped exclusively with diesel engines, primarily the PACCAR MX-13 and Cummins X15. Diesel engines do not utilize spark plugs for ignition. Instead, they rely on compression ignition, where air is highly compressed, causing its temperature to rise sufficiently to ignite the injected diesel fuel.
Therefore, discussions about spark plug heat range, electrode materials (iridium, platinum, or copper), and gapping procedures are not applicable to your 2019 Kenworth T680. Attempting to locate or install spark plugs in a diesel engine would be incorrect and futile.
Replacement procedure tips
Since the 2019 Kenworth T680 uses diesel engines, there is no spark plug replacement procedure. Maintenance for the ignition system in a diesel engine focuses on components relevant to the fuel injection and glow plug (if equipped for cold starting) systems, not spark plugs.
Known issues
There are no "known issues" regarding spark plugs for the 2019 Kenworth T680 because, as discussed, these vehicles do not use spark plugs. Common issues like cracked porcelain on Ford 3-valve engines or broken plug shells are entirely unrelated to the operation or maintenance of a Kenworth T680.
Need plugs replaced? Find a shop on Repairius.
More specs for the 2019 Kenworth T680
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2019 Kenworth T680 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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