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Check and adjustment of the mechanical-hydraulic

Stall-Test

general information

Some car companies believe that the implementation of this test carries a risk of transmission exit out of operation due to the occurrence of increased pressures on its operating elements!

Stall-Test is used to check the serviceability of functioning of the converter of rotation (torque converter) and evaluation of retention of brake assemblies and clutch transmission assembly.

One of the defining conditions of the scan is a good condition and correct setting of the power unit, - check the coolant level, engine oil and ATF

Verification is performed during operation to warm up to normal operating temperature, the engine and transmission set to AT - do not forget to cock a lay brake and prop up the wheel chock.

The check Stall-Test need a good map of the specification tachometer and engine speed. Connect the tachometer should be carried out strictly in accordance with the manufacturer's instructions of the device, - try to place the meter so that his face is well visible from the driver's seat.

On top of the dial is reasonable to apply the label of maximum allowable RPM - minimum and maximum rpm Stall-Test-as is usually given in the specification map.

The main drawback of the described test is the potential overheating of the transmission. For this reason, not all manufacturers publish a specification card rpm Stall-Test. However, Stall-Test is widely popular among professionals involved in regenerative repair of automatic transmissions, for which AT manufacturers can issue special bulletins, compiled on the basis of intra-research works.

The order of execution procedures

PERFORMANCE ORDER

Cock a lay brake and prop up car wheel chock. Warm up the engine and transmission - ATF temperature must be within the range of 70 ÷ 80 ?� C. Connect the engine tachometer. When the charged parking brake check the idle speed ?� Engine (see chap. Current care and maintenance) in the "P" selector lever. Move the selector lever to ?�R?�. Left foot firmly depress the foot brake, right gently squeeze the gas pedal to the floor - after the engine speed stabilizes, consider reading the tachometer and immediately release the gas pedal. To prevent damage to internal components AT pedal should not be held down for more than 5 seconds! Move the selector lever in position ?�N?�, and allow the engine to idle for at least one minute in order to prevent irreversible changes in the composition of ATF from overheating. Repeat modes ?�D?�, ?�D-HOLD?� and ?�L?� AT. On the map below, determine the state of the internal nodes of the transmission assembly, if necessary, make appropriate corrections. Analysis of the test results Stall-Test, procedures for troubleshooting Result of checking possible cause The procedure for corrective action READING understated for all modes AT Stalled overrunning clutch in the torque converter Faulty e / m the manager or executive valve on-off converter lock Engine does not develop the required power Replace the torque converter Check the condition of the valve, perform the necessary corrections Adjust the engine (see. The introduction and the Head Current leaving and service and motor) Inflated readings modes "D" and "R" Do not develop the required rail pressure Broken serviceability of functioning overrunning clutch O / D To slip clutch O / D Check the rail pressure Check the condition of the clutch Check the condition of the clutch Inflated readings mode "D" Do not develop the required rail pressure To slip clutch forward gears Broken serviceability of functioning freewheel number 2 Check the rail pressure Check the condition of the clutch Check the condition of the clutch Inflated readings mode "R" Do not develop the required rail pressure To slip clutch direct perception Stalling the brake mode "R" and "L" Check the rail pressure Check the condition of the clutch Check the condition of the brake assembly Inflated readings mode "D-HOLD" Do not develop the required rail pressure Stalled brake gears from the 2nd and higher Stalling the brake mode "2" Check the rail pressure Check the condition of the brake assembly Check the condition of the brake assembly Inflated readings mode "L" Do not develop the required rail pressure Stalling the brake mode "R" and "L" Check the rail pressure Check the condition of the brake assembly

Checking the response delay (Time-Lag-Test)

Check line pressure

PERFORMANCE ORDER

Perform preparation procedures similar to those described above for testing Stall-Test. Connect the engine tachometer (do so in accordance with the manufacturer's instructions of the device) and the cocked lay brake Check the idle speed at the position "P" selector lever (see chap. Current care and maintenance). Through a special nozzle adapter to connect the service port inspection transmission line pressure gauge. Left foot firmly depress the brake pedal, push the lever to position ?�D?� and read the pressure gauge to the engine idle speed. While holding down the brake, right foot gently squeeze the gas pedal to the floor and when the engine speed is stabilized (turns Stall-Test-a), read the pressure gauge reading and immediately release the gas. To prevent damage to internal components AT pedal should not be held down for more than 5 seconds! Move the selector lever in position ?�N?�, and allow the engine to idle for at least one minute in order to prevent irreversible changes in the composition of ATF from overheating. Operating in a similar manner, make a line pressure measurement modes ?�R?�, ?�D-HOLD?� and ?�L?� transmission. Finished checking, remove the gauge and stop the service port NEW stopper, tightening it with a force of 14.7 ÷ 17.6 Nm. Compare the results of the measurements with the nominal values. Nominal values of line pressure Line pressure, kgf / cm 2 (kPa) Mode Engine speed Idling Turns Stall-Test-a "D", "D-HOLD", "L" 3.7 ÷ 4.1 (363 ÷ 402) 9.5 ÷ 11.0 (932 ÷ 1079) "R" 5.5 ÷ 6.1 (540 ÷ 598) 13.2 ÷ 15.7 (1295 ÷ 1540) On the map below, determine the state of the internal nodes of the transmission assembly, if necessary, make appropriate corrections. Analysis of the test line pressure, procedures for troubleshooting Result of checking possible cause The procedure for corrective action Inflated readings modes "D" and "R" Jammed the throttle valve Conjuring the primary regulator valve Disturbed adjustment drive a cable AT Check the condition of the valve Check the condition of the valve controller Make adjustment (see. Section Check and adjustment of drive cable AT) Understated indication modes "D" and "R" Jammed the throttle valve Conjuring the primary regulator valve Worn pump assembly Disturbed adjustment drive a cable AT There is a leak in the hydraulic circuit clutch O / D Check the condition of the valve Check the condition of the valve controller Check the condition of the pump assembly Make adjustment (see. Section Check and adjustment of drive cable AT) Check the condition of the clutch, the corresponding valves and components Understated readings mode "D" There is a leak in the hydraulic circuit of 1st transfer mode "D" There is a leak in the hydraulic circuit clutch forward gears Check the status of associated valves and components Check the condition of the clutch, the corresponding valves and components Understated readings mode "R" There is a leak in the hydraulic circuit mode "R" There is a leak in the hydraulic circuit clutch direct perception There is a leak in the hydraulic brake circuit mode "L" and "R" Check the status of associated valves and components Check the status of associated valves and components Check the condition of the brake assembly, the corresponding valves and components

Sea trials

If AT is suspected of infringement of serviceability of functioning, first of all you should always try to determine the nature of performance failure.

On branded service stations generally can be ordered AT card switching, which specifies regulations contemplated transmission shift points for various operating parameters (speed, load, vehicle type, switching direction). In the most detailed maps may indicate additional settings such as the setting of regulatory control pressure drive clutch and brake assemblies. In addition, it can also be given an explanation for the interpretation of revealed during trial violations. Comparison of parameters of the actual switching taking place during sea trials, with a corresponding map will help locate possible sources of faults.

There are two ways of running tests. In the first case, at the wheel of the vehicle must be in person the owner of the car, which will allow the examiner to ascertain the adequacy of his driving skills requirements of switching cards. In the second case, a test check carried out in traffic-free safe location - experienced a driver and his assistant produced a detailed verification of the functioning of the transmission parameters of a map switching. During the test checks operation of the drive train, engine and systems of their management. Normal operation AT depends largely on the health of the engine operation, and therefore, this unit during the test is given not less attention than most antibodies.

In determining the transmission shift points actually checked the correct ratio of throttle actuation pressure and centrifugal regulator at different engine loads. Another factor that should be given special attention during the test, a shock-free switching of the transmission. Switching can take place in strict accordance with the requirements of the maps, but the violation of their smoothness, or excessive inertia will be a strong argument for the need to check the status of implementation of the accumulators.

During the test run should be checked all possible speed and load modes - the completeness of the collected information is the key to the correct conclusions. Particular attention should be paid to the behavior of the vehicle when the owner of the described conditions when the violations occurred, - accuracy of the fault conditions is a fundamental factor in identifying its source.

In case of minor faults expressed in violation of external regulations or failure of components, replacement of which does not require dismantling of the transmission from the vehicle, appropriate procedures are made on the spot. If the problem is serious, the client is invited to the overhaul of the transmission.

During the tests, the transmission should be warmed up to normal operating temperature (70 ÷ 80 ?� C).

3, O/D ?� 2, O/D ?� 1, 3 ?� 2, 3 ?� 1 ?? 2 ?� 1. Make sure of serviceability of activation switch kickdown mode ?�D?�, - switching should take place in all the prescribed combinations: O / D ?� 3, O / D ?� 2, O / D ?� 1 3 ?� 2, 3 ?� 1 and 2 ?� 1.

In the event of unusual noises or vibrations, try to determine the nature of their occurrence. The most likely sources of noise and vibration backgrounds are torque converter, drive / propeller shafts and differentials. It should keep track of the dependence of occurrence of noise / vibration of the original settings when the vehicle is in a mode ?�D?�: O / D with locking torque converter, O / D converter lock-free, 3rd gear (when the special mode HOLD).

Compare the results of observations with the following card violations.

Analysis of the results of running tests, procedures for troubleshooting