The teeth of the gears of the oil pump drive and the ignition distributor must not have any chipping, nicks, burrs or work hardening. In case of such defects, replace the gears and the shaft with new ones.
Oil pump drive shaft bushings. Check the inner diameter of the bushings, their press fit in the sockets, and the alignment of the lubrication hole in the front bushing with the channel in the cylinder block (turning the sleeve). The inner surface must be smooth and free of burrs.
Having measured the diameters of the roller and bushings, determine the gaps between the bushings and the bearing surfaces of the roller. If the gap exceeds 0.15 mm (wear limit), and also if the surfaces of the bushings are damaged or their pressing is weakened, replace the bushings with new ones.
Figure 2-73. Removing and installing the oil pump drive shaft and ignition distributor bushings:
1 - mandrel A.60333/1/2.
When replacing, use the A.60333/1/2 mandrel for both removal and installation (figure 273), observing the following:
- the bushings must be pressed into the sockets, while the oil hole in the front bushing must be opposite the channel in the cylinder block;
- after pressing, the bushings must be finally processed and adjusted to the inner diameter (dimensions are given in figure 2-68). To ensure complete alignment of the roller bushings, the A.90353 reamer is used to finish them, with which both bushings are processed simultaneously.
Oil pump drive gear bushing. Check the bushing press fit. The inner surface should be smooth and free of burrs, otherwise replace the bushing.
To press out and press in the bushing, use the A.60326/R mandrel (figure 2-74).
Figure 2-74. Pressing out the bushing of the oil pump drive gear and ignition distributor:
1 - mandrel A.60326/R.
After pressing in, process the bushing with a reamer to 16.016-16.037 mm.
[The article is reprinted from the website CHEVYMAN.RU]