Driveshaft and UJ (universal joints)

Un doing the bolts at the centre
flange.

For the driveshafts, we had to dis assemble the UJ's which require a lot of hammering. we had to write a list of equipment that we would require for the job. This includes A big hammer, a big punch, wooden blocks, a DTI, screw drivers, spanners and pliers.
We first had to check the phasing of the UJ's. The phasing of our driveshaft was correct and is unable to be changed so nothing could be done here anyway.
Drive shaft balance needs to be checked. This can be done in various ways. One way is to put it in a lathe and use weights in a trial and error method to see when the driveshaft is balanced.
To check driveshaft runout, we use a DTI on the driveshaft sitting in Vee blocks. We then turn the driveshaft to see how much runout we get. The manufacturers specification is maximum of .6mm. At the front we got .49mm, middle was .44mm and rear we got .32mm. This is within specs so this is ok.
Next was to check the UJ's. They operated smootgly and there was no axial movement.

Using the DTI to check the driveshaft
runout.

To dis assemble the UJ's, we first had to remove the snap rings. We then had to hit the cross down to remove the cups. This required alot of force, but we got there in the end.
We then removed all of the grease from the components so that we could inspect them. We found that all of the caps, yokes and journals, rollers and seals were all in good condition.
We then had to re assemble the UJ's, we made sure that we put grease into the caps and yoke surfaces. After hammering the caps into position, we re fitted the snap rings and then checked that the UJ operated smoothly.

The UJ with the cups removed.

There were no problems with the UJ so no new parts were needed. Once we re assembled it, the UJ operated smoothly.