The seat belt on my 1987 Chevrolet S10 locks before its fully out

Seems to come complete

https://www.google.com/search?q=1987+s10+4+cylinder+idler+pulley+mounting


https://www.walmart.ca/en/ip/Serpentine-Belt-Tensioner-Pulley-for-Chevy-S10-GMC-S15-Isuzu-Hombre-Pickup-2-2L-Idler-Pulley-Auto-Parts-Accessories-OEM-419-115/PRD1OLGOQNAH4D3

Please check if your seat belt has "Retractors" or "Automatic Retractor".

Follow these steps to determine if you have a retractor system that will hold car seat securely or your seat belt won't retract as should be:

A. Pull belt all the way out.

b. Allow belt to retract about 6 inches (15 cm).

c. Pull out on belt again.

If belt is locked and you cannot pull the belt out any further, you have an Automatic Locking;

If you pull the belt again all the way out and won't return to normal operation, then the mechanism is damaged, but try first the "retractor" lock to be sure. By Federal Law, nobody will sale a seat belt in a junk yard, try the dealer or order thru the dealer the whole seat belt or the mechanism. I hope that is just a matter of the automatic retractor; you can see this information in your car's manual. Try and we will see.

deat belt is not fixable,it is safety reason,get a new one

Here's a link for you. Please rate my thread. Thank you.

http://www.carpartswholesale.com/v5/details/Chevrolet/S10/AC%20Delco/Fan%20Drive%20Belt/1987/AC6K960.html&ci=A1165930884W457eb1843f043&cpwid=cpwchevrolets1019871987acdelcoac6k960822794fadrbe87/

in order to get the oil pan off of a 4 w/d model the front axle assy must be removed first then oil pan removal is straight forward after that. cv axles can be left in just need to take out the 6 bolts on each one drain oil out remove the cable engagement on the bottom wire plug and 4 mounting bolts. rotate assy to remove it. the other way is to remove the engine. take your pick.

If your seat belt is in the door, start slamming your door after you are inside the car and this will activate the tensioner that holds the seat belt in place. This will not always work ,just cross your fingers.

it is either a loose belt, or the bearings are going in alternator. remove belt and spin alternator by hand to see if this is the problem.

Put a 15mm wrench on the tensionor pulley center bolt, release tension and hold, remove belt. Tensionor is spring loaded and should move freely with a fairly good amount of tension so be carefull not to pinch fingers and make sure to use the boxed end of the wrench, keep it squarely and fully seated on the bolt at all times.

pulling gives no resistance? it doesnt lock stopped when you yank it?... the belt mechanism needs replaced ..whats wierd is both sides are failed at same time....hmmmm