LLQ-3 Cylinder leak tester

LLQ-3 Cylinder leak tester

Use of motor vehicle testing equipment:

LLQ-3The type cylinder leak analyzer is suitable for detecting whether the cylinder seal of automobile engine is within the allowable air leakage range, and further from the fault phenomenon analysis to judge its leakage location and cause, so as to take measures to eliminate the fault.

Principle:

The test principle is that when the engine is static and the piston is at the stop point on the stroke, a certain amount of compressed air is injected into the cylinder. The time it takes for the cylinder to drop to a specified value, reflecting the amount of air leakage. The shorter the time, the greater the amount of air leakage; Conversely, the smaller the amount of air leakage. If continuously fed into the fixed pressure air can also be judged to cause the main part of the leak, in order to have a targeted maintenance of the engine.

Instrument Construction:

The instrument consists of a voltage regulator, an inlet pressure gauge, a measuring pressure gauge, a guide pipe, a quick change connector, etc.

0---1.6MPa

Working gas source pressure: 0.6---0.8MPa

How to use it:

1, the engine spark plugs removed, the use of hand to turn the crankshaft, so that the piston at the upper stop point, hang the direct gear, pull the vehicle brake, in case the test time compressed air to push the piston movement.

2, in the compression on the first cylinder to twist on the air Supply Connector, the Guide pipe belt Quick change connector end and the output end of the measuring instrument, at the same time, the air compressor and the test instrument input side connected. Close the instrument pressure regulating valve (pull the voltage regulator knob out when used).

3, start the air compressor inflatable, when charged to0.8MPaWhen closed, ready to remember the stopwatch, quickly open the pressure regulating valve, at the same time press the stopwatch, record the pressure retention time, observe the measurement of pressure gauge changes, when the gauge pressure drops to0.4MPaWhen, press the stop stopwatch, record the table pressure from the0.8MPaFell0.4MPaThe time used, with the length of this time to compare the same machine, you can diagnose the degree of damage to the cylinder leakage, the longer the maintenance time, the better the cylinder sealing; If the pressure maintenance time is very short, usually in the10Seconds below, indicating that the cylinder leakage is serious and must be repaired. For ease of testing, the test sequence of each cylinder is carried out according to the ignition order of the cylinder, and the crankshaft turns every half turn (180°), A cylinder can be tested.

Leakage site Judgment:

Start the air compressor, to the external stop point of the cylinder air supply, with the pressure control valve will be controlled at 0.6MPa, carefully listen to the leakage sound, in order to judge the cylinder leakage site. If the leakage sound is heard at the carburetor, indicating that the inlet valve is not sealed, such as at the muffler mouth of the exhaust pipe to hear the sound of air leakage, indicating that the exhaust valve is not sealed, such as in the oil mouth to listen, generally there is a leak sound, a slight small sound is normal; If a bubble is seen coming out of the water at the radiator water outlet, it indicates that the cylinder pad is burnt out, causing the cylinder to collude with the water sleeve, and if the air leakage sound is heard at the adjacent cylinder spark plug of the cylinder, indicating that the cylinder pad burns between the two cylinders and the punching cylinder occurs.

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