Sealing the casing
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Check that the casing's mating surface is clean and flat.
Wipe off the cleaned sealing surfaces on casing and transmission with methylated spirits.
NOTE:
Take care to ensure that no impurities or foreign objects get into the transmission.
Apply a bead of sealant about 3 mm thick on the casing. Part number 1161409-6. Also apply sealant round the screw holes.