- Ford first produced the Bronco for the 1966 production year with the goal of competing with the Jeep and International brands of off-road vehicles. The early Broncos were initially available only with two engine choices: the 170-cubic-inch six-cylinder and the 289-cubic-inch eight-cylinder. The 170 was replaced with the 200-cubic-inch six-cylinder engine in 1973, and the 289 was replaced by the 302-cubic-inch eight-cylinder in 1969. The six-cylinder engines were standard equipment and the eight-cylinder engines were optional. Regardless of the type of engine, its torque specifications must be closely adhered to.
- Tighten the spark plugs on all engines to between 15 and 20 ft-lb of torque.
- Tighten the cylinder head bolts on the 170 and 200 engines to between 70 and 75 ft-lb of torque. Tighten the head bolts on the 289 and 302 engines to between 65 and 72 ft-lb of torque.
- Tighten the intake manifold bolts on the 289 and 302 engines to between 20 and 22 ft-lb of torque.
- Tighten the exhaust manifold bolts on the 170 and 200 engines to between 13 and 18 ft-lb of torque. Tighten the exhaust manifold bolts on the 289 and 302 engines to between 15 and 20 ft-lb of torque.
- Tighten the rocker arm shafts on the 170 and 200 engines to between 30 and 35 ft-lb of torque.
- Tighten the connection rod caps on all four engines to between 19 and 24 ft-lb of torque.
- Tighten the main bearing caps on all four engines to between 60 and 70 ft-lb of torque.
- Tighten the flywheel bolts on all four engines to between 75 and 85 ft-lb of torque.
- Tighten the harmonic balancer bolt on the 170 and 200 engines to between 85 and 100 ft-lb of torque. Tighten the balancer's bolt on the 289 and 302 engines to between 70 and 90 ft-lb of torque.
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