2018 Ford F-150 Serpentine Belt Guide
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 Answer
- Belt Length: 97.0 inches (2464 mm)
- Rib Count: 6
- OEM Belt Part Number: FL3Z-8620-A
- Aftermarket Cross-References: Gates K060970, Dayco 5060970, Continental Elite 4060970
- Auto-Tensioner Part Number: FT4Z-6B209-A
- Idler Pulley Part Number: YS-373
Belt Routing
Before you remove the old serpentine belt, we strongly recommend taking a clear photograph of its path for reference. The routing for the 2018 Ford F-150 with the 3.5L EcoBoost engine is as follows:
- The belt starts at the crankshaft pulley at the bottom center of the engine.
- From the crankshaft, the belt travels up to the A/C compressor.
- Next, it goes around the idler pulley.
- From the idler pulley, the belt moves to the alternator.
- Then, it routes to the power steering pump.
- After the power steering pump, it wraps around the water pump.
- Finally, the belt goes to the tensioner before returning to the crankshaft pulley.
How to Replace the Serpentine Belt
To replace the serpentine belt on your 2018 F-150, you will need a serpentine belt tool or a long-handled 3/8" breaker bar. Locate the automatic tensioner—it has a 3/8" square hole where you will insert your tool. Apply pressure to the tool to release the tension on the belt, allowing you to slip it off the pulleys. When installing the new belt, ensure it is correctly seated in the grooves of each pulley before releasing the tensioner.
Replacement Interval
For the 2018 Ford F-150, it is recommended to inspect the serpentine belt at every service and plan for replacement between 60,000 and 100,000 miles. However, this can vary based on driving conditions. If you frequently drive in harsh climates, more frequent inspections and replacements may be necessary.
Signs of a Failing Belt or Tensioner
Be on the lookout for these signs that your serpentine belt or tensioner may be failing:
- Squealing or Chirping Noises: This is often the first sign of a worn or misaligned belt.
- Visible Wear: Look for cracks, fraying, or glazing on the belt. Any visible damage means it's time for a replacement.
- Accessory Malfunctions: Since the serpentine belt powers many of your truck’s accessories, a failing belt can lead to issues with the A/C, power steering, or charging system.
- Tensioner Pulley Noise: A grinding or rattling noise from the tensioner area can indicate a failing bearing in the tensioner pulley.
If you're not comfortable replacing the serpentine belt yourself, find a trusted shop on Repairius.
More specs for the 2018 Ford F-150
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.
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.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
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
2018 Ford F-150 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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