2021 Ford F-550 Super Duty Service and Repair Manual

This factory service and repair manual for the 2021 Ford F-550 Super Duty covers two overhead valve V8s, the turbocharged 6.7L diesel of 406 cubic inches and the naturally aspirated 7.3L gasoline engine of 445 cubic inches, in a chassis cab built as a four-door crew cab, a two-door conventional cab or a four-door extended cab. Three trims are listed: XL, XLT and Lariat. The diesel fuel system features heavily in this year's record, and the procedures, specifications, torque values, wiring diagrams and diagnostics for the 6.7L fuel filtration and high pressure pump, together with the wheel hub and wiper coverage, are the parts of the book that matter most.

Engines covered

• 6.7L V8 (406 cu in) — OHV, turbocharged, diesel
• 7.3L V8 (445 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 4-door cab & chassis, crew cab
• 2-door cab & chassis, conventional
• 4-door cab & chassis, extended cab

Trims covered

• Lariat
• XL
• XLT

Known issues on the 2021 F-550 Super Duty. Eight recalls are on federal record for 2021, several on the diesel fuel system: a void in the secondary fuel filter cap can grow into a leak, and biodiesel deposits on the high pressure fuel pump rollers can lead to pump failure. Front wheel hub extenders may also be improperly attached, risking wheel separation. Owners have logged 12 complaints with NHTSA, nine on the fuel system and one each on the power train and steering. The manual's diesel fuel system procedures and specifications, and its wheel hub torque values, cover those items.