How would you check the drive shaft balance without special instruments?
What will be an ideal response?
First, put four numbers around the circumference of the driveshaft. Because imbalance can be related to runout, put the #1 mark at a point opposite to the greatest runout. Put the clamp with the weight at the #1 position and run the shaft. Check to see if it feels better or worse. Then move it to the #2 position and try it again. Try all four positions. You are trying to find out where to put the weight.
When you find the best position, move the hose clamp halfway between the numbers to one side to see if the vibration improves. If it gets worse, try it the other direction. When you find the best position, add another hose clamp and repeat the procedure. The clamps can be separated to fine-tune the amount of weight needed.
Another procedure used by experienced technicians is to run the engine to turn the shaft while carefully holding a piece of chalk near the shaft. The heavy spot will tend to be marked by the chalk. The hose clamp will go opposite the chalk mark.
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