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The fuel into the crankcase, can make the lubricating oil thinning, thinning to reduce oil film lubrication effect, also cause corrosion on the shaft and bearing. Bearing alloy surface was dark green, with a slight cavitation. Special is a by-product of the higher sulfur content of the fuel combustion, fuel into being poor ventilation crankcase, sulfuric acid substances generated will cause cavitation serious on the surface of the shaft.
Causes: fuel supply of fuel oil system is too large, the fuel is sprayed into the combustion chamber can not be completely combustion; inlet gas fuel can not be blocked into enough, sufficient combustion of fuel nozzle seal failure; penetrate into the crankcase; cylinder internal combustion oil tract airhole or crack; idle rotation time is too long, the engine temperature is low fuel can not be fully combustion.
To prevent the lubricating system caused by the shaft and the bearing damage and damage must be:
A, in the absence of manual lubrication equipment cases, when installing the engine to movement in the surface of each shaft and Bush coating and use the same label clean lubricating oil, engine after the installation, the initial start before closing the fuel switch, starter for driving the engine idling a few times, when the engine oil pressure gauge is displayed, and then turn on the open the fuel switch, accelerator in low speed, start the engine operation observation.
B, the engine after long term storage, first starts to go through boot machine drives the idling, start it again.
C, must be on the engine maintenance, according to the provisions of the time to check, replace the lubricating oil and filter.
Lubricating oil D, engine surface, must be within the scope of the standard, lubricating oil and gas use tools must be clean, prevent the entry of any dirt and water, while ensuring the sealing effect of each part of the engine.
E, avoid the engine idling time is too long, idle running can not be more than 5 minutes.
F, after the engine starts must pass through the medium speed heating operation, when the water temperature rose to 70 degrees above and then put into use.
G, the engine over long time full load operation, not immediately stop, must let the engine no-load low-speed rotating after 15 minutes to stop, otherwise the internal heat spread out.