The Buick 3.8-liter engine was produced by General Motors from 1975 to 2008, with a number of basic modifications made to it over the course of its lifetime. In 1985, the 3.8-liter engine came geared up with a serpentine belt system to drive the engine equipment. This engine was utilized in a variety of GM automobiles, together with the Pontiac Bonneville, Buick Regal and Oldsmobile 88 and 98. The serpentine belt ought to be checked each 5,000 or 6,000 miles for indicators of damage or harm.
Buick 3.8 Liter Serpentine Belt Installation Instructions
Disconnect the negative terminal cable from the battery. Find the belt routing diagram inside the engine bay. If a diagram isn’t present, seek the advice of the owner’s guide for the belt routing diagram.
Find the belt tensioner pulley between the power steering pump and alternator. Place a socket and ratchet on the 15mm bolt positioned on the tensioner pulley and move the pulley up and away from the belt. Slip off the belt from the tensioner pulley and slowly release the tensioner back into place.
Remove the belt from the other pulleys. Examine the brand new serpentine belt to the previous belt to make sure it’s roughly the identical size and type.
Route the brand new belt onto the other pulleys based on the belt routing diagram. Move the belt tensioner pulley up and then slip the belt onto the pulley. Slowly move the tensioner pulley again into place. Examine the belts to make sure they’re seated correctly. Reconnect the negative terminal cable to the battery.
[taken from ehow.com]