1. The cylinder head nut is not tightened or the cylinder head gasket is damaged. When turning the crankshaft, if there is a leakage sound at the joint surface between the cylinder head and the machine body, the cylinder head nut may not be tightened, or the cylinder head gasket may be damaged. If it is the former, it should be tightened as required. If the latter is the case, when the cylinder pad is not badly damaged, the asbestos thread can be used to make up for the damage, and in case of serious damage, replace the new pad.
2, intake, exhaust valve leak. There are two reasons for this type of air leakage: First, the valve clearance is too small to close the valve and it is necessary to readjust the valve clearance. The other is that there may be spots on the valve sealing cone surface, such as rust, carbon deposits and other debris, but also make the valve closed lax. The crankshaft can be cranked during the inspection. If there is a “buzzing, squeaking†sound in the air cleaner and the exhaust pipe, the inlet and exhaust valves will leak. The valve needs to be ground.
3, piston ring excessive wear. When turning the crankshaft, the inside of the body (such as low oil shell) leaks sound, most of them are on the piston ring. Some clean oil can be added into the cylinder. If the compression force is increased after the addition, the piston ring should be replaced.
4. The opening of the piston ring is moved to a straight line (commonly known as the counterpart), or the piston ring is stuck in the ring groove due to carbon deposition, and the cylinder cannot be popped up. The phenomenon is that when the crankshaft is turned, there is a sound of air leakage in the crankcase. The piston ring should be removed to remove coke. If the ring moves to a straight line, the positions of the openings should be evenly distributed, but the direction of the piston pin must be avoided.
5. Loose injector fixing bolts. The cylinder head is leaking at the injector and it should be tightened.
Other reasons: If the bearing bush or bushing is bitten to death, the crankshaft cannot be turned; the piston is reversed or the air filter is blocked so that the diesel engine cannot start. Although this type of situation is relatively rare, it is worthwhile.
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