According to the workshop manual, all bolts are tightened to 40NM to start with, in strict sequence, which is in the book, then all bolts a further 60degrees, then all bolts a further 60 degrees again, then the ten longest bolts, (1, 2, 7, 8, 9, 10, 15, 16, 17 and 18), a further 20 degrees.
geoff
so your torque wrench will do to start with, but I'd use a 1/2 inch drive for the rest!