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Common faults and analysis of silencer for jcb backhoe

(Summary description)A car muffler is a special device that blocks sound transmission and allows airflow to pass through, preventing airflow dynamic noise.

Common faults and analysis of silencer for jcb backhoe

(Summary description)A car muffler is a special device that blocks sound transmission and allows airflow to pass through, preventing airflow dynamic noise.

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A car muffler is a special device that blocks sound transmission and allows airflow to pass through, preventing airflow dynamic noise. However, due to the complex structure, heavy weight, high-temperature oxidation sound-absorbing filler, high-speed airflow impact sound-absorbing filler, water vapor permeation sound-absorbing filler and other reasons, the muffler has been frequently repaired, the noise reduction effect is poor, and the service cycle is short. main problems facing the device.

Fault phenomenon: The muffler is firing when the car is driving. During the parking inspection, when the high-voltage main wire of the ignition coil is unplugged, the power-off contact of the distributor is pulled or the crankshaft is turned, the flashover is normal, but it is found that the distributor is broken. Electrical contacts are ablated.
Fault inspection and elimination: According to the above phenomenon, the cause of the muffler firing was carefully analyzed. In order to find the crux of the fault, the ignition sequence, the spring force of the power-off contact arm of the distributor, the ignition timing, and the spark plug were all checked. No problems were found. Continue to check the carburetor air filter and valve clearance to no avail. Started the engine again and it worked fine again, but it didn't take long for it to relapse.
Stop and check the distributor section again. Through disassembly and careful inspection, it was found that the copper glue line from the contact arm of the circuit breaker to the low-voltage terminal was broken at the corner. After replacing the broken copper glue line, the failure phenomenon disappeared.
Failure analysis: When the engine temperature is low, although it is difficult to start, the engine can run normally after starting. After the temperature of the engine rises, the resistance increases with the rise of the temperature, so the high-voltage electricity generated by the ignition coil will be more insufficient, the high-voltage spark will be weaker, and even the fire will be broken. Due to the fire from time to time, the unignited combustible mixture in the cylinder is discharged into the muffler. When it expands in the muffler, it will detonate when it encounters sparks in the exhaust gas, which is manifested as the muffler blasting.
 

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