Checking before installing
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Check that the transmission and engine mating surfaces are absolutely clean.
Also check that the guide sleeves on the engine are in place and fault free.
Lubricate the holes in the transmission (for the guide pins). Use a little grease.