Please note: This writeup to be completed on my 2001 Jeep TJ through a 4.0L I-6 engine, and it likewise worked on mine 1998 Monte Carlo Z34 with a 3.8L V6 (it should also apply to Cherokees, grand Cherokees and also Wranglers through the 4.0L). Back engine layout/design will certainly vary amongst auto-manufacturers, the an easy ideas and principles in this writeup should use to many vehicles v a serpentine belt system.

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Every 30,000 miles I replace the serpentine belt in mine vehicles even if it is they look choose they require it or not. A serpentine belt is an inexpensive method to make sure that you won"t get stranded from a broken, rotten, old serpentine belt. Through age, your rubber serpentine belt will start to crack and dry-rot, and also could probably break at the worst feasible place. This belt is additionally known as the "accessory belt" or "fan belt" and it is a way to move power from the rotating crankshaft to drive necessities/accessories such as:

Alternator (for charging the battery and also keeping your electrical system running)Water pump and cooling pan (for vehicles not equipped through an electrical cooling fan)Power steering pump (to provide you power-assisted steering if you have it)Air air conditioning (AC)smog pump (air pump)supercharger

On most vehicles that are thrust regularly, belt replacement every 30,000 miles is almost TOO frequent. To uncover out how to check and also see if her belt is needing changed or not, inspect my belt inspection writeup. When I replace my belt, assuming the old one isn"t completely trashed, I placed the old one in mine trail box just in case a girlfriend (or heaven forbid ME) demands a preventive belt.

This project must take 30 minutes or less, also for the start mechanic. Follow along in the easy measures below and you must be simply fine.


I have had many reports from readers the in 2002 Jeep readjusted the belt-tensioner square hole dimension to 1/2". So, you might need a 3/8" or a 1/2" breaker-bar depending on what year your vehicle is.


Tool/Supply List


1 Serpentine Belt (I usage Goodyear Gatorback P/N 4060882)Shop light or Flashlight

Step 1


First, open up the hood, acquire out the shop light and 3/8"-drive breaker-bar/socket-wrench. I indicate using a breaker-bar if you very own one; I completely destroyed a socket wrench law this one time...the pressure compelled sometimes is an ext than what a socket wrench is designed come withstand. Now, locate your "Belt Routing" diagram, i beg your pardon is a decal that have to be affixed to the height of the radiator or on the sheet steel under the hood somewhere fairly visible.

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After detect the routing decal, locate belt tensioner. In the picture below, the red arrow is pointing come the belt tensioner"s 3/8" square hole for her breaker bar. The silver, oval-shaped steel arm is the tensioner.

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Now, insert her wrench/bar in the hole pictured in step two. As you room standing at the front of your Jeep dealing with to the rear, you want to use your wrench/bar to revolve the belt-tensioner eight clockwise (depicted by blue arrowhead below); this will be in the direction of the floor in many cases. This gets rid of the stress from the belt. While the anxiety is gotten rid of from the belt, traction the belt towards the former of the auto (shown by green arrowhead below) and slip it turn off of the tensioner. If you have challenge slipping the belt off of the tensioner, try to on slide it turn off of among the countless other pulleys instead.

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Now you can release pressure on the tensioner. This step involves totally removing old belt. Because that my TJ, it involved getting under the Jeep come detangle whatever off the the big crankshaft pulley and to path then belt about the pan blades.

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Now the the old belt is off, gain out the new belt and put it back on in the reverse method that you take it it off, nice simple! once you have actually it put earlier together, clean up her tools and start her Jeep and also listen for any brand-new strange sounds (like a belt slipping or rubbing). Keep in mind that a Gatorback belt renders a zippy, whirring sound; don"t confused this v a real problem. Close the hood, you"re currently done.