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If it's a new belt that you are trying to put in, make sure it is routed properly. Also match it up with your old belt and make sure it isn't longer than the old one.
If the belt was already in your car and it's now loose, check to make sure the belt is not damaged. If the belt looks good, you may need a new tensioner.
Good luck
Engine used a serpentine belt, with a spring-loaded tensioner. You cannot tighten the belt. If the belt is slipping, either one of the driven components is going bad and dragging the belt, or the tensioner is bad.
Put the serpentine belt on to the pulleys of your 1994 Chevy engine. Tighten a serpentine belt with the tensioner pulley.
The belt is self adjusted by way of a tensioner.
CHANGING ALTENATOR BELT: 1. loosen compressor bolts push towards engine to remove compressor belt 2. loosen power steering bolts and push pump towards engine to get slack to remove belt. 3. loosen altenator bolts pus it towards motor to get slack and remove belt. 4. put new belt on push altenator away from motor to tighten slack in belt and tighten bolts 5. push power steering pump away from motor to tighten belt and tighten bolts 6. push compressor away from motor to tighten belt and tighten bolts. REMOVE FAN BELT: Do steps 1,2,5 and 6 REMOVE COMPRESSOR BELT: Do steps 1and 6
To tighten the alternator best on a 240sx, loosen the bolt on the alternator on the drivers side. Pull on the alternator away from the engine to adjust the belt. When it has no more than a quarter inch of give, tighten the bolt to finish.
Go under the engine and follow the belt down to the under side of the engine. You will see a metric size 14 bolt just to the left that runs up to the tensioner. Turn clockwise to tighten but don't over tighten.
how do you tighten fan belt on l200
Tension is accomplished with a belt tensioner, it is probably defective and needs replaced.
just in front of the altenator, there is a 10mm bolt, tighten that and it will tighten the fan belt
the belt on the engine is loose, so you want to see if you can tighten it or get a new belt . i hope this helps
1992 4.3l engine
To tighten a loose drive belt, find the pully that is connected to the belt. Tighten the pully and then hold the belt in place using the adjuster belt. Check out the related video to see an example of how this is done.