Is Opening the Cylinder Head Considered an Engine Overhaul?
1 Answers
Simply removing the cylinder head to inspect the cylinder block does not qualify as an overhaul, but replacing components such as the crankshaft, connecting rods, and pistons is considered an overhaul. Below are precautions for disassembling and assembling an automobile cylinder head: 1. First, check for any residual antifreeze in the cylinder head bolt holes or other holes. If present, remove it immediately and replace the cylinder head gasket and other sealing gaskets. 2. Rotate the crankshaft by hand to position one of the engine's pistons at the top dead center (TDC) of the compression stroke. Then, slightly reverse the crankshaft and insert the guide bolt of the specialized tool into the cylinder head bolt hole for positioning. 3. Remove the cylinder head nuts symmetrically from both ends toward the center, then take off the cylinder head and cylinder liner gasket. The timing belt and multi-ribbed belt should be handled in the reverse order of disassembly, and the tension and valve timing should be adjusted. 4. If the cylinder head is difficult to remove, gently tap it with a wooden mallet or rotate the crankshaft to use the gas pressure inside the cylinder to help dislodge the cylinder head. Alternatively, you can weld a handle onto an old spark plug, screw it into the spark plug hole, and use it as leverage for easier removal.
