What are the causes of my 2002 dodge neon not starting after i changed the tensioner pulley

15mm

over p/s pulley,down to a/c pulley ,up to crankshaft pulley ,under tensioner pulley

remove the belt, then remove the pulley, you may need a tensioner bar or sometimes a 3/8 ratchet will fit. when you instal the new one there may be a keyway or alignment dowel, besure it slides into place before tightening it down

You have to remove the whole bracket that the tensioner assembly is attached to then you can get at the bolts that holed the tensioner and pulley together to service. Have fun.

Make sure you locate the Serpentine Belt Routing Sticker before you proceed. If not make an excellent drawing and take a GOOD Picture. Do NOT try to just remember how it goes back on Should be a 15mm wrench to loosen tensioner to remove belt. Locate mounting bolts to tensioner and remove, replace with NEW tensioner tighten bolts then use wrench arc torque about 15 degrees should snug it down, reroute belt then using 15mm pull tensioner to either side of belt to install belt in correct route. Remove all tools and body parts from engine bay. Do not start engine if anyone is in the vicinity of engine bay. Belt may fly off if you did not do it right and cause all kinds of shrapnell, if it doesn't fly off, visually inspect belt before starting and after, I would suggest being very careful before during and after starting to insure safety.

Hello.
There should be some bolts that hold the pulley on to the motor. Check behind the bracket, I believe they are the bolt size of 9/16. If you are trying to get the serpentine belt off, you can also just have someone hold the pulley away from the belt as you maneuver the belt off the pulleys.
Hope this helps! -Steve

buy manual, you might have to remove other componants

SERPENTINE BELT TENSIONER?IT IS PART OF FRONT ENGINE MOUNT BRACKET ASSEMBLY..YOU MUST REPLACE FRONT BRACKET/TENSIONER AS A COMPLETE ASSEMBLY..IT'S A BIT OF WORK..YOU HAVE TO REMOVE P/S PUMP,BOTH BELTS,UPPER ENGINE TORQUE STRUT,LOWER ENGINE TORQUE STRUT AND CRANKSHAFT PULLEY..AS FAR AS I KNOW IT IS A DEALER PART

the tensioner is part of the engine mount bracket..not serviced seperately as far as i know

The power steering and A/C belt is tensioned by a tensioner pulley. Mine went bad and was "screaming" I thought it was the power steering pump and I replaced it only to find that it wasn't the problem. I couldn't find any bolts and deemed it too much of a problem for me to replace at home. The shop had to drop the engine and transaxle assembly from the engine bay in order to get enough room to replace the pulley. The problem with many FWD cars is having enough room to work so if you have to replace it, the engine has to move because you only have about two inches of room otherwise.