Use the indicated product to lubricate the seal ring (18) and fit it into seat with a suitable tool.
Fit spacer (17) and snap ring (16).
Oil sight glass
If previously removed, refit the sight glass:
Lubricate sight glass (19) with specified product.
Using a suitable drift, fit the sight glass to the value indicated in the figure.
Make sure that two of the four holes (20) are parallel with the cover bottom (21).