I don't know the exact torque but I wouldn't put more than about 5#/ft or good and snug by hand with a driver type tool.

The plate is designed to compress the seal fully and contact the pump housing.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250