Why does the diesel engine of an off-road forklift frequently blow the cylinder head gasket?

The cylinder head gasket of an off-road forklift being burned by high-temperature gas inside the cylinder is called "blown head gasket," also known as "burned head gasket." The rise in the oil level in the diesel engine oil pan of an off-road forklift is caused by diesel or water entering the oil pan. For some diesel engines not equipped with a rear crankshaft skeleton oil seal, the rise in oil level may also be due to hydraulic transmission oil entering the oil pan.