Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Ford Explorer STFACTORY OEM SERVICE PROCEDURE
Engine System - General Information
- Specifications
- Description And Operation
- Diagnosis And Testing
- Engine
- Inspection and Verification - Engine Performance
- Inspection and Verification - NVH
- Symptom Chart - Engine Performance
- Symptom Chart - NVH
- Component Tests
- Compression Test 2.3L
- Compression Test 3.0L
- Cylinder Leakage Detection
- Excessive Engine Oil Consumption
- Intake Manifold Vacuum Test
- Oil Pressure Test
- Valve Train Analysis 2.3L EcoBoost & 3.3L Duratec
- Valve Train Analysis 3.0L Ecoboost
- Engine
- General Procedures
- Bearing Inspection
- Camshaft Surface Inspection
- Connecting Rod Bearing Journal Clearance
- Crankshaft Main Bearing Journal Clearance
- Cylinder Block Core Plug Replacement
- Cylinder Block Distortion
- Cylinder Bore Taper
- Cylinder Head Distortion
- Exhaust Manifold Cleaning and Inspection
- Piston Diameter
- Piston Inspection
- Piston Ring End Gap
- Piston Selection
- Powertrain Drivetrain Mount Neutralizing
- RTV Sealing Surface Cleaning and Preparation
- Spark Plug Inspection
- Valve Guide Inner Diameter
- Valve Stem Diameter
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.