You ask, I find out!

For the recent visitor who stumbled on this little corner of the world who was searching for the horsepower of a 1986 240DL, from this Volvo factory webpage we find that the mighty B230F engine pumps out 114hp (SAE net) @ 5400 rpm, and 136lb-ft of torque (SAE net) @ 2750 rpm.

(Possibly a pedantic point, but torque is expressed as "pound-feet," not "ft./lbs." as shown on the webpage.)