What is the required torque for tightening cylinder head bolts in a car?

[VonValeria]

The torque required for tightening cylinder head bolts in a car depends on the size of the bearing cap: 1. Large bearing caps require 8 Nm of torque; 2. Small bearing caps require 6 Nm of torque. The method for tightening cylinder head bolts is: 1. Start from the middle and work outwards, tightening to 50% of the final torque initially, then loosening all bolts; 2. Again, tighten from the middle outwards to 50% of the final torque; 3. Finally, tighten the cylinder head bolts completely, following the sequence of middle first, then the sides. Preventive measures for cylinder head cracks include: 1. Evenly tighten cylinder head bolts and correctly adjust fuel injection timing; 2. Use soft water in the radiator and minimize water changes; 3. Avoid prolonged operation of the engine under overload conditions.