The Bolt Torque Specifications for a 1997 4.2 L V6 Ford Engine

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The Ford 4.2-liter, six-cylinder engine was only produced during the 1997 and 1998 model years. The engine is most commonly associated with the F-150 pickup truck as a replacement for the long-used 300 cubic inch six-cylinder. As with all engines, the torque specifications must be carefully followed to avoid damaging the engine block or the component that the fasteners secure.

Cylinder Head Bolts

  • The cylinder head bolts must be tightened in a particular sequence. Tighten all bolts to 14 ft-lb of torque. Tighten each bolt a second time to 29 ft-lb of torque. Torque all head bolts again to 36 ft-lb of torque. Loosen each head bolt three complete turns. Tighten the head's shorter bolts to between 15 and 32 ft-lb of torque. Tighten the longer bolts to between 30 and 36 ft-lb of torque. Finally, tighten each bolt an additional 175 to 185 degrees.

Rod Bearing Nuts

  • Tighten the rod bearing nuts to an initial torque setting of 29 ft-lb of torque, then tighten each nut an additional 90 degrees.

Main Bearing Bolts

  • Tighten all but the rear cap bolts to 91 ft-lb of torque. Tighten the rear cap bolts to 88 ft-lb of torque. Finally, tighten the brace bolts to 40 ft-lb of torque.

Flywheel-to-Crankshaft Bolts

  • Tighten the flywheel-to-crankshaft bolts to within a range of 54 and 64 ft-lb of torque.

Intake Manifold Bolts

  • Tighten the intake manifold bolts to eight ft-lb of torque.

Exhaust Manifold Bolts

  • Tighten the exhaust manifold bolts to 22 ft-lb of torque.

Rocker Arm Mounting Bolts

  • Tighten the rocker arm mounting bolts to between 23 and 29 ft-lb of torque.

References

  • "Haynes Repair Manual: Ford Pick-ups & Expedition, 1997 thru 1999"; Jay Storer and John Haynes; 1999
  • Photo Credit Jupiterimages/Comstock/Getty Images
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