Insert a thickness gauge to measure.įigure 1: Cylinder head strain measurement 1, and apply the straight edge in 6 directions A to F on the lower surface of the head and 3 directions G to I on the manifold mounting surface. Replace those with cracks.Ĭheck the strain on the lower surface of the head and the manifold mounting surface as shown in Fig. If necessary, cracks are inspected by the dye penetrant inspection method, which is one of the non-destructive inspection methods. Inspection of cracks and strainĪfter removing the carbon adhering to the underside of the head, inspect the cracks in each part such as around the valve seat. In addition, significant oil adhesion to the inlet port is often caused by oil dropping from the inlet valve, and dust adhesion is often caused by a defective air cleaner, so the situation before disassembly can be judged from these. Inspect the water jacket for scale and rust, and clean any significant ones. Key points of disassembling and assembling the valve mechanismĬheck the adhesion of carbon around the exhaust port and valve seat, and be careful not to damage the valve seat, especially when removing the carbon on the underside of the cylinder head.Inspection and correction of valve mechanism.Key points for disassembling and assembling the flywheel and ring gear.Check and correct flywheel and ring gear.Key points for assembling crankshafts and journal bearings.Key points for disassembling the crankshaft and journal bearings.Inspection and correction of crankshaft and journal bearings.Key points for assembling connecting rods and connecting rod bearings.
Key points for disassembling the connecting rod and connecting rod bearing.Inspection and correction of connecting rods and connecting rod bearings.
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