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Judgment of Mitsubishi S12 diesel engine overhaul period


Detailed Description:

Judgment of Mitsubishi S12 diesel engine overhaul period

Generally, the judgment criterion of the Mitsubishi S12 diesel engine during the overhaul period mainly depends on the decrease of the compression pressure of the Mitsubishi S12 diesel engine and the increase of the lubricating oil gas in the exhaust caused by the increase of the lubricant consumption of the Mitsubishi S12 diesel engine.

In addition, a decrease in output power, an increase in fuel consumption, a decrease in oil pressure, difficulty in starting, and an increase in noise are also conditions for determining whether overhaul is required. However, these phenomena are more affected by other reasons, and cannot be used as a judgment criterion for overhaul.

There are many external phenomena caused by the reduction of the compression pressure of the Mitsubishi S12 diesel engine, and it is difficult to make an immediate judgment. The external phenomena are,

(1) Output power is reduced.

(2) Fuel consumption has increased.

(3) Lubricant consumption of Mitsubishi S12 diesel engines increased.

(4) Wear of cylinder liners of Mitsubishi S12 diesel engines, pistons of Mitsubishi S12 diesel engines, etc. caused leakage of combustion oil and gas to increase, and the amount of fuel oil discharged from the crankcase breather of Mitsubishi S12 diesel engines increased. (Confirm the amount of oil and gas by visual inspection.)

(5) Poor contact between the intake and exhaust valve of Mitsubishi S12 diesel engine causes an increase in air leakage.

(6) Starting becomes difficult.

(7) The noise of each part of the Mitsubishi S12 diesel engine increases.

(8) The exhaust color of the Mitsubishi S12 diesel engine is abnormal after warming up.

Wait for the above phenomena to appear mixed.

Some of these phenomena are directly related to the deterioration of the Mitsubishi S12 diesel engine body, and some are not necessarily.

(2) and (6) are significantly affected by the amount of fuel injected by the fuel injection pump, the fuel injection time, the wear of the plunger, the quality of the fuel injection piping, and the state of electrical devices such as the battery and the starter motor.

The most important criterion for judging the overhaul is item (4). The reduction in compression pressure of the Mitsubishi S12 diesel engine caused by the wear of the cylinder liners of the Mitsubishi S12 diesel engine and the pistons of the Mitsubishi S12 diesel engine, plus the comprehensive judgment of other items reasonable.

2. Mitsubishi S12 diesel engine compression pressure measurement

(a) Each Mitsubishi S12 diesel engine cylinder is independent. It is dangerous to spot check two or three Mitsubishi S12 diesel engine cylinders to estimate the status of other Mitsubishi S12 diesel engine cylinders. All Mitsubishi S12 diesel engine cylinders must be tested.

(b) The compression pressure of the Mitsubishi S12 diesel engine varies with the speed of the Mitsubishi S12 diesel engine. The number of revolutions must be measured simultaneously.

(c) It is important to regularly check the compression pressure of the Mitsubishi S12 diesel engine. It is important to understand the changes in the compression pressure of the Mitsubishi S12 diesel engine.

(1) Remove the Mitsubishi S12 Diesel Engine Injector from the Mitsubishi S12 Diesel Engine Cylinder being tested.

(2) Install a pressure gauge connector at the installation location of the Mitsubishi S12 diesel engine injector, and connect the Mitsubishi S12 diesel engine compression pressure gauge.

(3) Set the rack of the fuel injection pump of the Mitsubishi S12 diesel engine to the non-injection position (rack "0"), and use the starter motor to turn the M12 Mitsubishi S12 diesel engine. When the speed is stable, read the speed and the compression pressure of the Mitsubishi S12 diesel engine.

Note: When cranking with starter motor, make sure the battery is fully charged. The battery voltage is insufficient to reach a sufficient speed, and the correct compression pressure of the Mitsubishi S12 diesel engine cannot be measured.

(4) When the measured value exceeds the limit, perform disassembly inspection.

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