A diesel engine's cylinder head is a part of a vehicle's combustion chamber. It connects to the intake and exhaust valves, as well as spark plugs, and allows the flow of air and fuel through the engine. The torque of the cylinder head is important to the engine's performance and longevity. Ford, Chrysler and GM are just three automakers that offer diesel engines with cylinder heads in their vehicles.
The Ford 6.7-liter 406ci V-8 is a diesel engine featured on the 2011 Ford 250-Super Duty. The bolts connecting the cylinder head to the engine block have 140 foot-pounds of torque. The bolts connecting the intake manifold to the cylinder head have 34 foot-pounds of torque, and the bolts connecting the rocker arm to the cylinder head have 42.5 foot-pounds of torque.
The Chrysler 2.0-liter is a diesel engine featured on the European 2011 Chrysler Sebring. The outer cap bolts connecting the camshaft to the cylinder head have 18 foot-pounds of torque, while the inner bolts connecting the camshaft to the cylinder head have 8.75 foot-pounds of torque. The outer bolts connecting the cylinder head to the engine block have three steps with 20 foot-pounds of torque and a fourth step with 90 degrees of torque. The inner bolts have a first step with 25 foot-pounds of torque, a second and third step with 50 foot-pounds of torque each, and a fourth step with 90 degrees of torque. The bolts connecting the exhaust manifold to the cylinder head have 16 foot-pounds of torque, and the bolts connecting the intake manifold to the cylinder head have 21 foot-pounds of torque. The spark plug connected to the cylinder head has 20 foot-pounds of torque. The bolts connecting the thermostat housing to the cylinder head have 16 foot-pounds of torque, and the bolts connecting the valve cover to the cylinder head have 8.75 foot-pounds of torque.
The GM 6.6.-liter 400ci V-8 is a diesel engine featured on the 2011 GMC Sierra 3500HD. The bolts connecting the cylinder head to the engine block have 65 foot-pounds of torque. The bolts connecting the valve cover to the cylinder head have five foot-pounds of torque. The bolts connecting the intake manifold to the cylinder head have 33 foot-pounds of torque. The outer bolts connecting the exhaust manifold to the cylinder head have 20 foot-pounds of torque, and the inner bolts have 30 foot-pounds of torque. The 0.8125-inch spark plug connected to the cylinder head has 22 foot-pounds of torque, while the 0.625-inch spark plug connected to the cylinder head has 15 foot-pounds of torque. The stud connecting the rocker arm to the cylinder head has 50 foot-pounds of torque.
The 2011 Ford 250-Super Duty has a peak horsepower of 400 h.p. at 2,800 r.p.m. and a peak torque of 800 foot-pounds at 1,600 r.p.m. when equipped with the Ford 6.7-liter diesel engine. The 2011 Chrysler Sebring has a peak horsepower of 138 h.p. at 4,000 r.p.m. and a peak torque of 299 foot-pounds at 2,500 r.p.m. when equipped with the Chrysler 2.0-liter diesel engine. The GMC Sierra 3500 HD has a peak horsepower of 397 h.p. at 3,000 r.p.m. and a peak torque of 765 foot-pounds at 1,600 r.p.m. when equipped with the 6.6-liter diesel engine.
