If a pneumatic actuator for the secondary chamber throttle valve is installed in a car with a carburetor type engine, the owner of such a car may face the problem of deteriorating fuel atomization and a decrease in torque at low crankshaft speeds. In certain cases, it is possible to improve the operation of the engine by weakening the spring of the pneumatic actuator, that is, by reducing its rigidity.
Necessary
- - mandrel;
- - blowtorch;
- - ruler;
- - anti-corrosion varnish.
Instructions
Step 1
Determine first if the secondary chamber comes into service in a timely manner. To do this, disconnect the rod of the pneumatic drive mechanism from the intermediate lever. Remove the vacuum corrector hose and close the fitting hole.
Step 2
Start the engine. Ask your assistant to gradually increase the speed to five thousand per minute.
Step 3
Identify changes in the position of the diaphragm hex head in the mechanism. If the top end of the locknut is at the level of the bottom plane of the body when the stem moves nine to ten millimeters from its original position, the diaphragm mechanism of the secondary chamber is working normally. In case of deviations from these parameters, determine the reasons for the disturbances in its operation.
Step 4
Check the elasticity of the pneumatic chamber diaphragm. To do this, first remove it and remove the spring from there. Assemble the device. In this case, it is not required to install it on the carburetor.
Step 5
Raise the pneumatic chamber. The stiffness of the diaphragm is normal if the lower "poppet" of the device has moved from the upper position to the lower position due to the weight of the stem.
Step 6
Install the diaphragm housing on the carburetor (without spring) if you want to finally make sure that the secondary chamber starts up late. To do this, assemble the device without placing the spring in it. If the throttle response of the car has increased at a crankshaft speed of more than two thousand per minute, therefore, the assumption of a late entry into the operation of the secondary chamber is confirmed.
Step 7
Eliminate the problem by loosening the mechanism spring. First slide it onto a mandrel of a suitable diameter, and then squeeze and secure the threads. The attached spring should be about three centimeters long.
Step 8
Heat the spring red hot with a blowtorch. Turn it while heating so that it warms up evenly.
Step 9
Remove the spring from the mandrel, clean the scale and inspect. If some of the turns in it for some reason tightened unevenly, straighten them.
Step 10
Measure the length of the spring. In a free state, it should be no more than three centimeters. After that, it is necessary to cover the spring with anti-corrosion varnish. Install the weakened spring into the diaphragm assembly.
