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

by John Stevens J.D.

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

About the Author

John Stevens has been a writer for various websites since 2008. He holds an Associate of Science in administration of justice from Riverside Community College, a Bachelor of Arts in criminal justice from California State University, San Bernardino, and a Juris Doctor from Whittier Law School. Stevens is a lawyer and licensed real-estate broker.

Photo Credits

  • photo_camera Jupiterimages/Comstock/Getty Images