How do you replace an idler on a Mercury Topaz?
DISCONNECT THE MOTOR MOUNTS ON THE LEFT SIDE, PLACE JACK UNDER OIL PAN, PUT PIECE OF WOOD BETWEEN JACK AND OIL PAN AND RAISE ENGINE. THIS WILL GIVE CLEARANCE BETWEEN FRAME RAIL AND IDLER. REPLACEMENT IDLERS ARE NO LONGER AVAILABLE FROM FORD, SO YOU HAVE TO KNOCK OUT BEARING AND REPLACE IT WITH NEW ONE. BEARINGS ARE COMMON AT MOST JOBBERS FOR LESS THAN 5 BUCKS. REMOVE SERPENTINE BELT REMOVE IDLER BOLT AND PULLEY, REPLACEMENT IS REVERSAL OF THIS. LOWER ENGINE, TIGHTEN MOUNTS AND YOU ARE READY TO GO.
If you go to www.autozone.com , click on vehicle repair on the left, check the year, then mercury, then topaz. It will bring up repair guide for 84-94. Next click on suspension and steering, then front suspension, then lower control arm. Save this site, it's great for any repairs you have. You don't have to login, and there are detailed pics :)