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Re: changing the altenator
Have you taken the belt off yet. The belt is tensioned with a pulley which is spring loaded. Look for a small pulley wheel about 2 inches in diameter. Put a spanner on the nut and move it to loosen the belt.The alternator is a fixed one which has no adjusting arm. Just bolts to secure it. Good Luck
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Your truck has one belt and one idler pulley. To tighten it you will need a large bar (a breaker bar, crowbar or large screwdriver will work) Loosen the idler pulley bolt (not all the way) just enough to break it loose then use the bar against the pulley to tension the belt. If there are parts missing from the idler pulley, a new one must be purchased.
The serpentine belt tensioner / pulley is on the front of the engine, and part of the belt 'routing'.
Its job is to put tension on the belt as it drives the other devices
like the power steering pump, water pump, air conditioning compressor.
It is an aluminum casting that mounts with a single bolt to the engine. The pulley is attached to the arm.
There are a few ways to move / pry the arm inwards, thus releasing the
tension on the belt for removing/installing: grab on the pulley bolt
(15mm?) with a wrench, or some later models have an opening for a 3/8th
socket wrench to attach to directly without a socket.
Purchase a serpentine belt wrench. They are a long flat looking wrench from a local auto store. There is a belt tensioner in the rear of the engine. Place the wrench on the tensioner pulley, and pull the wrench toward the front of the engine. This will loosen the belt. Install the belt around the crankshaft, and all other pulleys, excluding the alternator pulley. Hold the last bit of the belt in your hand, and then pull the tensioner toward the front of the engine again, and slip the belt onto the alternator pulley.
V-6 3.8 l http://www.mvreader.com/multiview/dayco/zoom.php?zoom_item=C0001X&l=&catalog=auto&category=2
there is a tensioner on the belt... it's a pulley near the back by the firewall that doesn't appear to drive anything. you will note a square hole in the side of it... that fits a 3/8 in ratchet.... use a long pry bar with that socket type ... on mine you have to pull it down i believe to remove tension... try it to make sure which direction it has to move.