2014 Kenworth T680 Spark Plug Type & Gap
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 ISX15 | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) |
Why the right plug matters
It's important to understand that the 2014 Kenworth T680 is exclusively offered with diesel engines (PACCAR MX-13 and Cummins ISX15). Diesel engines do not use spark plugs for ignition. Instead, they rely on compression ignition, where air is highly compressed within the cylinder, raising its temperature to ignite the atomized diesel fuel injected into the cylinder.
Therefore, discussions about spark plug heat range, electrode materials (iridium, platinum, copper), and gapping procedures are not applicable to your 2014 Kenworth T680. The ignition system for these engines consists of glow plugs, which are used to aid cold starting by heating the combustion chamber, but they are not involved in continuous ignition during operation like spark plugs in a gasoline engine.
How to gap a spark plug
As your Kenworth T680 uses a diesel engine, there are no spark plugs to gap. This section is not relevant.
Replacement procedure tips
Since your Kenworth T680 is a diesel vehicle, there are no spark plugs to replace, and thus no coil-on-plug removal, anti-seize debate, or dielectric grease application on boots to consider in relation to spark plugs.
Known issues
There are no known issues related to spark plugs for the 2014 Kenworth T680, as it is a diesel vehicle and does not utilize spark plugs. Common spark plug issues such as cracked porcelain on Ford 3-valve engines or broken plug shells are specific to gasoline engines.
Need plugs replaced? Find a shop on Repairius.
More specs for the 2014 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
2014 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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