What is the disassembly and assembly sequence of cylinder head bolts?
2 Answers
The disassembly and assembly sequence of cylinder head bolts is as follows: 1. Use a torque wrench or a special socket to loosen each bolt of the cylinder head in a crisscross and symmetrical order from both sides to the middle. 2. Continue using the torque wrench or special socket to unscrew the bolts from the cylinder head in the same sequence. 3. Remove the cylinder head and bolts, place them in a specific location, and arrange them in order. Extended content: 1. The function of the cylinder head is to seal the cylinder, form the combustion space together with the piston, and withstand the effects of high-temperature and high-pressure gas. 2. The cylinder head bears the mechanical load caused by gas force and the tightening of cylinder bolts, as well as high thermal loads due to contact with high-temperature gas. To ensure good sealing of the cylinder, the cylinder head must not be damaged or deformed. Therefore, the cylinder head should have sufficient strength and stiffness.
Removing cylinder head bolts isn't something to be done haphazardly - incorrect sequence can warp the cylinder head or even scrap the engine. Start loosening from the center bolt first, then progressively work outward in a crisscross pattern, gradually releasing pressure like spreading pancake batter. Installation follows the reverse sequence: begin by hand-tightening the center bolt, then torque it in three stages - first to half the specified value, then 75%, finally reaching full torque to ensure even force distribution. I learned this the hard way when neglecting this procedure caused oil leaks from the gasket, costing me a fortune in rework. Always clean bolt holes and threads to prevent old oil residue from compromising the seal. Use quality socket wrenches and torque wrenches - never skimp on tools. Maintain the crisscross rhythm throughout to prevent warping and ensure safety.
