Eaton Char-Lynn Motor – How To Check: Vehicle Motor Leaks?

      Eaton Char-lynn Motor     description: The seal of the motor cylinder of the vehicle includes the valve, the piston ring and the seal between the cylinder head and the cylinder block. There are many types of diagnostic tests.

  (1) Barometer inspection

  During the diagnosis, the motor that can start the operation is brought to the normal temperature of 80-90 °C, and the parts of the parts meet the normal working condition, then the spark plugs of each cylinder are stopped and stopped to reduce the resistance when the crankshaft rotates. The oil choke and the throttle are fully open, and each cylinder is pressed in the spark plug hole and then started again. The barometer indicates the reading result.

  (2) Compressed air inspection

  The cylinder piston to be inspected is shaken to the compression top dead center. At this time, the intake and exhaust valves are closed, and 490 to 780 KPa of compressed air is introduced into the cylinder through the spark plug hole, and then the sound is judged by the hearing to detect the presence or absence of air leakage. . For example, there is a leaking sound at the oil supply port, and the clearance between the piston and the cylinder wall is too large or the piston ring is poorly sealed. In addition, a plastic tube can be used to open the spark plug hole, and a cigarette is deeply sucked. After the plastic tube is blown into the cylinder, if the flue gas emerges from the spark plug hole of the adjacent cylinder, the cylinder head nose beam is burned through.

  (3) throttle comparison method

  When the vehicle motor is running, the throttle is increased. From the oil supply port, the crankcase can be heard to emit a continuous “beep, bang” sound, which is generated when the gas is broken into the crankcase when the compressed cylinder wall is compressed. At the same time, the oil smoke (ie, helium) will be pulsating from the oil supply port. In severe cases, similar to the sound of knocking the cylinder, a large amount of gas will appear in the oil supply port, and the exhaust pipe will have a lot of blue and black smoke. gas. When the throttle is released, the air leakage sound is weakened or disappeared, repeated comparisons are made, and then the cylinder that has leaked is determined by the single-cylinder breaking method.

  (4) Heuristic test

  After adding 20-30g of new oil to the top of the piston of the suspect cylinder, check the pressure with a pressure gauge. If the pressure rises significantly, the piston ring will wear. If the pressure does not change, it will leak the valve or cylinder gasket.

  (5) Sensory judgment

  Remove the spark plug of the non-working cylinder, block the spark plug hole with your thumb, shake the motor crankshaft, and judge the cylinder pressure by feeling. If it is labor-saving to crank the crankshaft and feels that the reaction force of the compressed gas is not large, the cylinder pressure is insufficient. When the motor is running, the high-pressure gas rushes out from the edge of the cylinder head, making a “beep, bang” sound, and there is a gas flushing feeling when the hand is close. After the spark plug of the cylinder is broken, the sound disappears; when the cylinder pressure is turned off, the cylinder gasket is burned and leaked.

  (6) Cotton lumps

  Using the single-cylinder breaking method to detect that the two adjacent cylinders are not working, the two-cylinder spark plug can be removed, and the cotton plug is used to fasten the spark plug hole. Rotate the crankshaft very slowly. If the cotton ball at the hole of the two-cylinder spark plug is not flushed out, it will be ablated and collided at the nose of the cylinder head.

  (7) Observation method

  When the motor is running, if there is a bubble at the water radiator water inlet, when the water is serious, the water enters the cylinder and is ejected from the exhaust pipe (water bead), which is the cylinder gasket between the cylinder and the water jacket hole. . When the spark plug is removed, there are water drops on the electrode; when the motor is used to rotate the crankshaft, water or water vapor is ejected from the spark plug screw hole, and it can be determined that the cylinder water jacket is burned through. If the surface area of ​​the spark plug electrode is too much, and there is moist oil, it is a poor seal of the piston ring and oil.

  (8) Sound test

  During driving, he suddenly felt that the motor power was insufficient, the sound was abnormal, and there was obvious valve snoring sound. Most of the (top-mounted) valves fell into the cylinder. If the intake valve falls into the cylinder, a large return air (the carburetor temper) can be heard in the cab; if the exhaust valve falls into the cylinder, an abnormal exhaust sound will be heard. If a cylinder does not work well and the motor can hear a “click” sound, you can use the auditory to identify or touch the edge of the cylinder head gasket with a compressed gas. This is generally the cylinder head bolt is not screwed to the specified Torque or cylinder head gasket is broken.

  (9) Commissioning method

  The motor idle speed is unstable, jittery, and even no idle speed; while the empty car accelerates well on a flat road, but the heavy-duty high-speed gear is not strong when going uphill. This phenomenon is generally caused by cylinder liner wear or valve closing. When the idle speed is adjusted, you can hear the “click” sound at the muffler mouth (like the air running when the air pump is pumping), which is the running phenomenon caused by the tight closing of the exhaust valve. Which one can be detected by the single-cylinder breaking method? The cylinder exhaust valve is faulty.

  (10) Fire test

  When the vehicle motor is running, the oil pipe mouth is flushed out to the thicker flue gas, and a clear snoring sound can be heard. The fire-breaking method is used to sequentially observe the smoke and helium of the oil pipe nozzle. After a cylinder is broken, the smoke is reduced, and the snoring sound is weakened, so that it can be determined as the fault location. This fault is mostly caused by the piston ring or the stuck air leak.