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Drivetrain Tools. Best Sellers. Support Technical Resources. Need help finding what you are looking for? Company About Us. What's New. In the process of movement inside the torque converter, the fluid centers the stator and the converter turbine, and in some way reduces the imbalance existing in the torque converter. But the imbalance may occur when replacing a certain part of the torque converter body. Many repair specialists mark the body and the cover of the torque converter before cutting the converter open in order to use them as a clue for proper welding.
In this case, it is just a mark to simplify combination of two torque converter halves. The same principle is applied when cutting the lock-up plate or removing the components, which rotate with the body.
In principle, this method is quite logical and time-proven. Equipment manufacturers offer balancing stands, designed specifically for torque converters.
But how reliable are they? Since the internal parts of the torque converter have a clearance, subsequently they can move a certain distance in the radial direction. If you simply install the torque converter on the balancing stand, then the moving parts will shift from the axle under the action of centrifugal forces. If you balance such torque converter on the stand, and just shake it up, then the imbalance will reappear.
It can be concluded that it is necessary to find a way to keep the internal parts locked. The difference between the presence and lack of splines on the shaft will be that without splines the internal parts of the torque converter may slip relative to the torque converter body in the process of acceleration or braking.
Splines will prevent the slippage, but only in case if the shaft is rigidly locked on the hub. This method can be applied if the torque converter is filled with ATF. First of all, the torque converter must be centered as accurately as possible relative to rotational axis of the stand.
It is necessary to position the torque converter on the balancing stand keeping in mind the alignment parameter; otherwise the process of balancing adjustment will be much more complicated. If the torque converter does not rotate on the faceplate of the balancing stand in the process of balancing adjustment, then it is not necessary to take preventive measures against unintended rotation.
But if the torque converter rotates on the faceplate, then the repair specialist has to lock it up via the holes by which the torque converter is attached to the flywheel. In this case, the positioning of fixing bolts must be equally distributed around the circumference of the torque converter, and the bolts themselves must have the same weight. If the torque converter is balanced accurately, then the imbalance parameter will be within acceptable limits.
With that in mind, it is possible to calculate the residual imbalance, which can be specified as. A car crankshaft rotates within the range from to 10, rpm. If we reduce grams and kilograms, then the imbalance value will be equal to 80 microns.
This is a conditional value by which the center of mass can be shifted relative to the axis of rotation. To get the value in grams shown on the balancing stand it is necessary to multiply this value by the mass of the torque converter kg and then divide the result by the correction radius mm. Let us apply the abovementioned algorithm on the example of the torque converter weighing 5 kg and having the diameter of mm. This means that the considered torque converter must be balanced to a value not higher than 2,85 g.
To simplify calculations, let us reduce this data into the following formulas :. M, kg — mass of the torque converter being balanced. D, mm - the diameter of the balanced torque converter. If you decide to perform the torque converter balancing adjustment, then first of all you have to understand what balancing method suits you best. You have to make sure that the equipment you have at your disposal will be enough to perform the balancing procedure accurately. And most importantly, if the torque converter imbalance on the stand is within the acceptable range, then you should not add or remove balance weights.
It can make things even worse. The torque converter balancing is the topic of ongoing debates. There is no universal method that can be successfully applied in any case. The final choice is yours. Finding quality transmission insights and reliable information is not an easy task for transmission specialists who are often either busy with transmission repairs or have their hands covered in oil after a transmission fluid change.
All in all, we may be exaggerating a bit but finding these materials is a timely process indeed. We at go4trans. There is a lot you can learn about transmission problem solutions and new transmission models being launched, we also try to interview transmission industry professionals so they can share some of their experience and stories with our readers.
We have also included what we find to be events of interest for anyone related to the transmission industry: you check dates, venues, profile and more details on the upcoming industry events. We have got food for thought that you need! You can add your own material at go4trans. If you want to share a story related to your business or if you want to highlight some industry news and introduce it to fellow specialists, we encourage you to submit your material to us by contacting us through the contact form or this email: info go4trans.
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