F-150 Mechanical Explorer

Putting It Back Together

Reassembly reference

Everything found online for getting a 2007 F-150 4.2L V6 back together, sorted by job: what to write down before it comes apart, the order things go back in, the figures that must be looked up, and the drawings and manual pages that give them.

Before you start

  • Work on a cold engine. Coolant under pressure and hot exhaust both cause serious burns.
  • Support the truck on rated stands, never a jack alone, and never a bumper or a wheel.
  • Relieve fuel pressure before opening any fuel line, and keep all sparks and flames away.
  • A/C lines must be discharged by a shop with recovery equipment — refrigerant under pressure injures skin and eyes.
  • Disconnect the battery before working near the starter, alternator or any harness.
  • Nothing in this app replaces the service manual or a professional. If a step involves lifting the engine, the fuel system or the brakes and you are unsure, get a mechanic involved.

The manual for your exact truck

Read every figure off these before trusting anything else

Rules that apply to every job

  • Photograph more than you think you need, before anything moves. Photos cost nothing and answer most questions later.
  • Bag and label fasteners per assembly. Bolt lengths differ within one part, and the wrong long bolt can bottom out and crack something.
  • Work from the inside out: the deepest parts go back first, then everything that covers them.
  • Reconnect the battery negative terminal last, after every other connection is finished.
  • Never guess a torque figure. A guessed number either strips a thread or leaves a joint leaking.
  • Fluids go in before the first start, and get checked again after the engine has warmed up and cooled down.
  • Turn the engine over by hand where you can before cranking it, so a trapped tool or misfitted part shows up harmlessly.
  • Leave time for a leak check: run it, shut it off, then look underneath after it has sat.

Serpentine belt & front accessories

The belt has one correct path around the crank pulley, water pump, alternator, tensioner, idler, power steering pump and A/C compressor. Get it wrong and an accessory turns the wrong way or the belt walks off.

Record this before it comes apart

  • Photograph the belt path from directly in front of the engine before releasing the tensioner.
  • Note which pulleys the smooth back of the belt rides on versus the ribbed side.
  • Count the pulleys your truck actually has — trucks with and without A/C route differently.

Order it goes back

General mechanical sequence, not a factory procedure — the manual page decides where the two differ.

  1. 1Release tension at the tensioner and slip the old belt off.
  2. 2Spin each pulley by hand and listen: a rough or noisy bearing is far easier to change now.
  3. 3Route the new belt over every pulley except the last easy one, following your photo.
  4. 4Hold tension off, seat the final pulley, then release the tensioner slowly.
  5. 5Check the belt sits fully in every groove with no rib hanging over an edge.
  6. 6Start the engine briefly and watch that the belt tracks straight.

Figures you must look up

  • Belt length / part numberVerification Required
  • Tensioner bolt torqueVerification Required
  • Accessory bracket bolt torqueVerification Required

Drawings & pages for this job

Nothing on this page states a torque figure, capacity, firing order or part number for your truck. Those stay marked Verification Required until you read them off a source for a 2007 F-150 4.2L and enter them, with that source, on the admin page. Links open on the websites that own them.