Why the cause of white smoke can be determined by oil loss via the valve guides
(1) The negative pressure of the intake manifold is high when the engine is idle, so oil is sucked into the combustion chamber (more…)
automotive
Automotive Fan Noise
Fan noise produced by the cooling fans for the radiator, alternator, and others, become louder in proportion to their rpm.
The fan noise can be produced by fan blades cutting through the air, or by air (more…)
Source of Automotive vibration Generation
As typical examples of vibrating force in a vehicle, there are the following: combustion pressure or torque fluctuation in the engine, unbalanced tires, rough road, imbalance or joint angle in the propeller (more…)
Automotive Resonating System
If vibrating force is applied to the spring and weight as shown in the figure, vibration rapidly becomes large when the frequency of the applied force reaches a certain frequency level. This phenomenon (more…)
Automotive Vibration and Sound
When driving on a highway, if the steering wheel or the body vibrates or an unpleasant booming noise is heard from some unknown place, the driver would feel anxious not only about the discomfort but also (more…)
Automotive Air Condition System Performance Test
1.Description
For cooling performance of the A/C, measure the difference of temperature between the inlet port and outlet port of the air, and judge whether the value is within the standard range in the (more…)
Automotive Air Condition System Inspection with Manifold Gauge
1.Normal
If the refrigeration cycle is normal, the gauge pressure values are as shown.
Low-pressure side
0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm
Diagnosis of Malfunction in Automotive Refrigeration Cycle
1.Importance of checking pressure
Checking the refrigerant pressure while the air conditioning is functioning allows you to assume the trouble area or the cause. Therefore, it is important to confirm (more…)
Automotive Air Condition System Visual and Aural Check
1.Is the drive belt loose?
If the drive belt is too loose, it will slip; this will cause it to wear out.
2.Amount of air blow is insufficient
Check for dirt and clog in the clean air filter.
3.Noise (more…)
Automotive Air Condition System Inspection/Test
Notes for Maintenance of Air Conditioning System
1.When handling refrigerant the following precautions must be observed
Do not handle refrigerant in an enclosed area or near an open flame.
Always (more…)