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Engine overhaul before the "eight to watch the eight check" rule

Date:2015/4/1 10:57:20 Visits:

A, see smoke look worn.

Two, carbon deposit check conditions.

Three, cold water temperature check.

Four, valve check valve.

Five, look at tank pressure leak check.

Six, smoky smoky check.

Seven, fuel injection Chaka lag.

Eight, watch the fireworks look up sooner or later.

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A, see smoke look worn.

When the engine is working, open the add engine oil cap, if there are strands of smoke emitted from the cover, that excessive wear or overrun the cylinder piston ring gap, if the gap does not meet the requirements should be repaired in time. Open the valve chamber cover, such as a hint of green, white smoke from the valve foot (i.e. valve face) out, that the valve or valve seat wear too large or ablation, or the valve clearance is too small or no gap, this can be directly seen which valve, in which only the cylinder leakage, should be promptly repaired.

Two, carbon deposit check conditions.

The diesel engine flameout, remove the exhaust pipe, check the exhaust port deposition conditions, can judge the working conditions of the engine. Carbon black surface was gray, like covered with a layer of frost, carbon layer is very thin, that diesel engine condition is good; carbon black color, but not wet, the diesel engine is slight burning oil, should be excluded; the exhaust port deposition thickness was significantly higher than that of the other cylinder exhaust port, the cylinder fuel injector is bad or cylinder seal worse, to be repaired or replaced; individual exhaust wet or oil, the cylinder exhaust quantities of oil, to be repaired; the cylinder exhaust port deposition layer is thicker, and the darker color, due to temperature is too low, or too late by injection, should be properly and timely adjustment.

Three, cold water temperature check.

The work of the engine when the cooling water temperature is too high (more than 100 DEG C, so that the engine overheating, resulting in insufficient air intake, and the friction loss of piston and cylinder group dramatic rise, the mechanical efficiency is decreased obviously. Therefore, to the timely maintenance of cooling system, engine work after 1000h, should remove scale cooling system, should also maintain the thermostat, water pump fan has good technical conditions, such as failure to promptly eliminate.

Four, valve check valve.

In the long-term work of engine, crankshaft, camshaft impact is not normal and distortion, timing gear, cam and tappet column surface, the follower will wear, the inlet, exhaust valve time postponed and deviate from the valve timing, the volumetric efficiency decrease, reduction of engine power. Therefore, regularly check the gas engine distribution phase, if does not meet the requirements shall be timely adjustment.

Five, look at tank pressure leak check.

Cylinder compression force is the key factor to influence power shortage. To determine the compressive force's approach is simple. Taking S195 diesel engine as an example: it is not the case in the decompression crank crankshaft, when shaking to the compression force, then up a good shake, shake hands handle to relax, but do not leave the handle, at this time, if there is a big rebound, illustrate the compression force is very good, and compression the power of poor. Again to check the leak of the reasons. Leakage is the main reason for the cylinder seal. In order to reduce searching range, when the engine is working, first close the air cleaner listen, whether there is a "hissing" sound, such as that associated with the valve, leakage; open the add oil cover again, if found strands of smoke, illustrate the cylinder and the piston, the piston rings leak.

Six, smoky smoky check.

The engine in normal working hours, generally do not smoke or take some light gray white smoke, sometimes difficult to see with the naked eye, such as engine smoke is the engine failure performance, this failure will also affect the engine power is reduced, it should check the smoke color. As smoke is less oil gas cylinder, incomplete combustion performance; take the blue smoke is cylinder liner and piston, valve and valve guide wear gap is too large, so that the oil sump oil combustion chamber channeling people burning oil performance; white smoke is water and fuel completely without burning diesel after vaporization pipe at out from the exhaust, the reason should be excluded the diagnosis.

Seven, fuel injection Chaka lag.

Take a look at the injection well, good injection is not deflection, not drop of oil, oil mist uniform, range appropriately, can hear the crisp outside machine "Puchi Puchi, sound, touch the high-pressure tubing can feel fuel" vibration "feeling. This approach also can diagnose multi cylinder machine "vibration" the size of the force and no "vibration" of force of the cylinder working condition, when necessary, can also be combined with the broken cylinder inspection, in order to symptomatic exclusion.

Eight, watch the fireworks look up sooner or later.

See head refers to whether the injection timing, that is to say the fuel supply advance angle are in accordance with the provisions. Various types of machine in diesel on the instructions indicate how much is their fuel supply advance angle. If the S195 type diesel engine fuel supply advance angle is 15 degrees - 18 degrees. This is because the air mixing, short heating time diesel injected into the cylinder after to spontaneous combustion, so the fuel injected into the cylinder during the compression stroke of the pistons time should arrive before tdc. Fuel supply advance time is used to represent the crankshaft angle. Too late (fuel supply advance angle is too small), diesel engine difficult to start, incomplete combustion, exhaust smoke, machine temperature is too high, power shortage; too early (fuel supply advance angle is too large), when diesel engine work is knocking, easily damaged parts, prone to reverse the startup, will also affect the power of the engine. Therefore, see the ignition is check the oil supply is too late or too early. Taking S195 diesel engine as an example, check the engine fuel supply advance angle is consistent with the technical requirements, the specific steps: