When the DODGE car camshaft fails, what vehicle abnormalities will be caused, and how to accurately determine the fault point through detection data?
When the DODGE car camshaft fails, the following vehicle abnormalities may be caused:
Starting difficulty: The camshaft is responsible for controlling the opening and closing time and lift of the intake and exhaust valves. If the camshaft fails, the intake and exhaust valves cannot be opened and closed at the correct time, which will cause insufficient engine intake or poor exhaust, so that the mixture cannot burn normally, resulting in difficulty in starting.
Power reduction: Due to the unsmooth intake and exhaust, the engine's charging efficiency is reduced, the combustion is not complete, and the engine output power is weakened. The vehicle will feel insufficient power when accelerating, the acceleration is slow, and the climbing ability is reduced.
Engine shaking: Camshaft failure may cause uneven intake and exhaust of each cylinder, making the combustion of each cylinder inconsistent, causing engine shaking. In severe cases, the entire vehicle body will feel obvious vibration.
Abnormal noise: If the camshaft and its related components such as camshaft sprockets, valve tappets, etc. fail during operation, abnormal friction or knocking sounds will be generated. For example, after the camshaft is worn, the gap between the cam and the valve tappet increases, and a "da da da" sound will be emitted.
Increased fuel consumption: Because the engine combustion is not complete and the power output is insufficient, the vehicle needs to consume more fuel to maintain normal driving, resulting in a significant increase in fuel consumption.
The following methods can be used to accurately determine the fault point through the test data:
Detect the wear of the camshaft: According to the high standards of Anhui KORBOR Machinery Co., Ltd. for camshaft manufacturing, the normal camshaft surface should be smooth, with uniform wear and very small wear. The diameter of the camshaft can be measured with tools such as a micrometer and compared with the standard value. Generally speaking, if the wear of the camshaft exceeds 0.05mm, it may affect its normal operation and cause the above abnormal phenomenon.
Check the curvature of the camshaft: Use a dial indicator to detect the curvature of the camshaft, support the camshaft on the V-block, and place the dial indicator contact against the middle part of the camshaft. Rotate the camshaft one circle. The difference between the maximum and minimum readings of the dial indicator is the curvature of the camshaft. Normally, the curvature of the camshaft should not exceed 0.03mm. If it exceeds this value, it means that the camshaft has deformed, which may cause problems such as abnormal valve opening and closing.
Check the timing data: Use the car fault diagnostic instrument to read the engine timing data. Under normal circumstances, the camshaft timing of the DODGE car engine should maintain an accurate phase relationship with the crankshaft timing. If the camshaft timing deviates, such as exceeding ±5°, it may be a timing error caused by a camshaft position sensor failure, a loose camshaft sprocket, or a camshaft failure.
Analyze the oil pressure data: Oil pressure is crucial to the operation of the camshaft. Too low oil pressure may cause poor lubrication of the camshaft, increased wear, and even locking. The normal oil pressure of the DODGE car engine should generally not be less than 150kPa at idle speed, and the oil pressure should be between 250-450kPa when the engine speed is 2000r/min. If the oil pressure is not within this range, combined with other abnormal phenomena, it can be determined whether the camshaft is affected by the oil pressure problem.
Detect valve lift: Use a dedicated valve lift measuring tool to measure the lift value of the valve driven by the camshaft. Different models of DODGE automobile engines have specific standard values for valve lift. If the actual measured value differs greatly from the standard value, such as more than 0.2mm, it means that the camshaft may be worn, deformed or otherwise faulty, resulting in abnormal valve lift and affecting the intake, exhaust and combustion process of the engine.