Note the adjuster locations for the belt in question (There are two ribbed belts on my engine and probably on yours- one for AC one for alternator)
Loosen the lock nut. Turn the adjuster bolt to tension and tighten the locknut. The tough part is getting the tension right. You should be able to deflect the belt about 3/8 to 1/2 inch between pulleys with moderate finger pressure. DO NOT OVER-TENSION!!! If your belt has 50,000+ miles on it, replace it. Don't try to save a buck here.
Re: Isuzu Trooper V6 2001 multi rib belt adjustment
First, if you're serious about car repair, get the shop manual (helminc.com). Not cheap, but cheaper than ruining your engine.
Second, unless you are confident in your mechanical abilities and / or are willing to use your vehicle as training, leave major work to the pros. A good mechanic is like gold, and just as hard to find.
Third, you don't really adjust the tension. There is a spring-loaded idler that puts just the right amount of tension on the belt. Using the proper tool, you lever the idler to take the tension out and slip the belt off the other pullies. Then take the new belt and rout it just like the old one, lever the idler again, then slowly release it back against the belt to take out the slack.
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step one remove battery neg lug . the above video (of book?) is wrong. the belt tension-ing step was skipped.
remove belt steps remove alt. wiring. remove alternator (bolts) it falls free. replace it , reverse steps above belt back tension belt. battery cable back. test run. charge/BAT lamp off? see wrench below, turn it CW. this releases the spring tension and belt comes off to put back, do same and put on belt and release wrench.
Belt Tensioner Operation: This device functions as an idler pulley and is located on either the inside or outside of the accessory drive belt. Its provides the correct tension for initial belt adjustment and maintains this critical tension adjustment during vehicle operation. It can be found on conventional V-belts and the newer serpentine ribbed belts.
All above is Bull Sxxxt. Isuzu bighorn Alternator belt only drives water pump (fan) and alternator. Size of belt is 17x1000 and its a tight fit onto pulleys so it makes you think its wrong belt, but trust me its not. As if you get 17x1025 or 17x1050 belt you wont get it tight correctly due to not enough adustment on alternator. To change/adjust the belt very simple. Loosen 3 bolts (14mm socket) on power steering pump (its 2 belts that diving power steering and air con), loosen tensioner on p/s pump. Remove those 2 belt - to get access to alternator belt adjustment bolts. There are 2 bolts you will need to loosen One at the bottom of alternator (14mm socket and 25mm extension bar to get it easier) another one is 12mm on tensioner rail. Than adjust tension by screwing 12mm long bolt that mounted across the tensioner rail until you get tension correct. Correct tension is about 68kg. But i do it just to get it nicely tight without too much of sag. REMEMBER DO NOT OVERTIGHTEN the belt as you will crush berings on water pump or alternator.
Open the hood and disconnect the battery ground cable.
Remove the adjusting arm bolt.
Remove the alternator through-bolt. Remove the drive belt from the alternator pulley and lower the alternator.
Some engines are equipped with a ribbed, K-section belt and
automatic tensioner. A special tool must be made to remove the tension
from the tensioner arm. Loosen the idler pulley pivot and adjuster
bolts before using the tool. See the accompanying illustration for tool
Label all of the leads to the alternator so that you can install them correctly and disconnect the leads from the alternator.
Remove the alternator from the vehicle.
To install, reverse the above procedure. Torque the pivot bolt to
58 ft. lbs.; the adjusting bolt to 25 ft. lbs.; the wire terminal nuts
to 60-90 inch lbs.
BELT TENSION ADJUSTMENT
The fan belt
drives the alternator and water pump. If the belt is too loose, it will
slip and the alternator will not be able to produce it rated current.
Also, the water pump will not operate efficiently and the engine could
overheat. Check the tension of the belt by pushing your thumb
down on the longest span of the belt, midway between the pulleys. Belt
deflection should be approximately 1
inch; (13mm).To adjust the belt tension, proceed as follows:
Loosen the alternator mounting bolt and the adjusting arm bolts.
Apply pressure on the alternator front housing only, moving the
alternator away from the engine to tighten the belt. Do not apply
pressure to the rear of the cast aluminum housing of an alternator;
damage to the housing could result.
Tighten the alternator mounting bolt and the adjusting arm bolts when the correct tension is reached.
1. Remove battery terminals and secure them away from the battery posts using nylon wire ties.
1a. Fine some comfortable eye glasses (clear or yellow) and keep them on. There are plenty of opportunities to get debris in your eyes during this procedure.
2. Spray "PB Blaster" (loosens bolts) on two bolts that secures alternator.
3. Jack-up vehicle on side to access alternator. Use a jackstand to support.
4. Using a 10mm open-ended wrench, loosen the bolt that swings the alternator. Screwing the bolt "in" or toward the engine will allow play to increase in the alternator belt. Loosen the 12mm bolt slightly next to the 10mm bolt (approximately 1.5" toward engine).
5. Continue to loosen 10mm bolt until there is enough slack in the belt to remove the belt from the alternator pulley.
6. Remove belt. It may be possible to remove belt without removing fan faring. Maybe not. If not, you will need to remove plastic fairing. If you must remove fair, go below fan fairing and disassemble connectors that hold together pieces of fan fairing. Carefully remove.
7. Install alternator fan from above.
8. Check that alternator belt is on all tracks (from below with a flashlight), and slowly tighten.
9. Secure 10mm and 12mm bolts. Recheck tightness.
10. Reassemble battery connection and run vehicle at idle for about 5 minutes. Check belt for proper tension.
11. CAREFULLY check tension of belt. Or disassemble battery connections and re-check belt tension.
12. Reassemble fan fairing (if not already assembled), re-connect battery terminals, and have a nice day. :-)