Jeep 4621844 Belt-Timing

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If the timing belt breaks while the engine is still running, valves can be damaged; an engine compression test is thus required after the belt has been fixed. The crankshaft and camshaft(s) should not be turned after the timing belt has been removed to prevent the damage to the valves. Start with the number one piston being set at the Top Dead Centre, then remove the negative battery terminal, and finally the drivebelts. Insert a large screwdriver or bar to hold the crankshaft damper pulley stationary, then, unscrew the large bolt in the center of the pulley. Replace pulley with 3-jaw puller with the right insert to safeguard the crankshaft bolt thread. Next the crankshaft pulley is removed and the crankshaft bolt is then replaced with one that has a spacer. Take off the right engine mount as well as the mounting bracket, while being keen to support the engine. Pull off the timing belt outer cover(s) and you should check the position of the camshaft sprockets and the crankshaft one which should be aligned before you remove the timing belt. Determine which of the timing belt tensioner is hydraulic or mechanical and continue with removal process. Gently remove the timing belt over the sprockets and if it's being re-used then ensure it is stored well. Check condition of crankshaft front oil seal, water pump, tensioner pulleys, timing belt; replace if worn. For installation, also ensure that the camshaft sprocket shows the appropriate timing marks before you position the crankshaft timing belt sprocket in the right position. Place the timing belt over the required elements so that no slack remains; to do this, turn the crankshaft clockwise and counter-clockwise using the tools. For those engines with the mechanical tensioner, it is advised to pull the retaining pin and rotate the crankshaft clockwise and there is some kind of stiffness, then it is paramount that there is contact between the valve and the piston. In hydraulic tensioners, the piston should be preloaded before mounting and applying tension to the pulley of the tensioner. Once aligned timing marks are correctly positioned, inspect the belt tension and then accomplish the procedure by the tightening of crankshaft pulley bolt and road test of the car.

If the timing belt breaks while the engine is operating the valves can be bent and as a result an engine compression test must be performed to detect any such problems. Never engage the crankshaft with a camshaft sprocket bolt or rotate it with one in place, and never rotate the crankshaft in an anti-clockwise direction. First, arrange that an air conditioning technician evacuates the refrigerant and then recharge it, then place the #1 piston at the TDC and bat off the negative terminal. Pull the accessory drive belts, engage the parking brake, apply block to the rear wheels and then use jack stands to secure the front part of the vehicle. If installed, If equipped, Remove right inner fender splash shield, loosen Crankshaft Damper Pulley bolt Position pulley on a 3-Jaw Puller and remove it. Specifically for the 2.0L models it is required to remove the exhaust pipe from the manifold, and air conditioning lines, the coolant should be drained out and the upper radiator support cross member. Disconnect the ground strap, the power steering pump, as well as the torque strut and the engine has to be lifted with the help of a floor jack supporting the oil pan. Loosen the right engine mount and timing belt cover screws with camshaft sprocket timing marks in position before to releasing the tension of the timing belt. For 2001 and 2002 models, you should take the tensioner out but for 2003 models the tensioner can be slacken using a 6 mm Allen wrench. Slide the timing belt off the sprockets and gauge the wear that it has, also, ensure the crankshaft front oil seal is leaking or not. When installing, squeeze the tensioner pin that is for the models 2001 and 2002, make sure that the camshaft sprocket marks are lined correctly and that the crankshaft timing sprocket is in the correct position. Replace the timing belt and adjust the tension of the timing belt and then reset the position of the timing belt tensioner. Turn the crankshaft clockwise to ensure that the timing marks align and then replace the components in the reverse sequence, topping up the cooling system and bleeding the air before cranking the engine and assessing road-worthiness of the vehicle. As for 2.4 L the procedure is to some extent similar to explained above, make sure that all the marks are properly aligned, the tension being set right before tightening all the bolts on last stage.

If the timing belt failed while the engine was running the chance of valve damage is probable, therefore an engine compression test should be carried out after the belt has been replaced. In the removal process, do not revimplify the crankshaft or camshafts once the timing belt is removed so as not to cause valve damage from impact by the piston. First, remove the negative battery terminal, properly jack up the vehicle placing jack stands and then remove the right inner splash shield and the accessory drive belts. You remove the crank shaft pulley by slackening the center bolt of the crank shaft pulley, if it cannot be held still by hand you could use a large screwdriver or bar to do this, use a three jaw puller to remove the pulley with the correct insert to protect the crank shaft threads. Retranslate the lower and upper timing belt covers, replace the crankshaft bolt with spacer and take out the right Engine Mount by using floor jack. I will make sure that the camshaft sprocket and the crankshaft are aligned in the right manner before the timing belt is removed and if one is to reuse it, the direction of the belt has to be marked. Relax the tensioner pulley in order make some space then remove the timing belt, and check the crankshaft front oil seal, the water pump, the tentioner, idler wheel and the timing belt for any signs of abrasion or wear. Ensure that the timing notches on the camshaft sprockets are properly aligned, turn the exhaust camshaft sprocket in the anticlockwise direction and fit in the timing belt by creating tension. Allen wrench should be used to turn the tensioner and tighten the lock bolt; then rotate the crankshaft two full rotations clockwise, if it is tight this may mean incorrect valve timing. If required rearrange the timing marks and replace the belt and other parts in the reverse sequence making sure that the crankshaft pulley bolt is tightened to the right torque before starting the car for road test.

If the timing belt failed while the engine was running the chance of valve damage is probable, therefore an engine compression test should be carried out after the belt has been replaced. In the removal process, do not revimplify the crankshaft or camshafts once the timing belt is removed so as not to cause valve damage from impact by the piston. First, remove the negative battery terminal, properly jack up the vehicle placing jack stands and then remove the right inner splash shield and the accessory drive belts. You remove the crank shaft pulley by slackening the center bolt of the crank shaft pulley, if it cannot be held still by hand you could use a large screwdriver or bar to do this, use a three jaw puller to remove the pulley with the correct insert to protect the crank shaft threads. Retranslate the lower and upper timing belt covers, replace the crankshaft bolt with spacer and take out the right Engine Mount by using floor jack. I will make sure that the camshaft sprocket and the crankshaft are aligned in the right manner before the timing belt is removed and if one is to reuse it, the direction of the belt has to be marked. Relax the tensioner pulley in order make some space then remove the timing belt, and check the crankshaft front oil seal, the water pump, the tentioner, idler wheel and the timing belt for any signs of abrasion or wear. Ensure that the timing notches on the camshaft sprockets are properly aligned, turn the exhaust camshaft sprocket in the anticlockwise direction and fit in the timing belt by creating tension. Allen wrench should be used to turn the tensioner and tighten the lock bolt; then rotate the crankshaft two full rotations clockwise, if it is tight this may mean incorrect valve timing. If required rearrange the timing marks and replace the belt and other parts in the reverse sequence making sure that the crankshaft pulley bolt is tightened to the right torque before starting the car for road test.

To remove the timing belt, start by detaching the cable from the negative battery terminal and removing all accessory drivebelts. Next, remove the bolts to detach the water pump pulley, followed by the crankshaft pulley bolts. Raise the vehicle securely on jackstands and remove the right inner splash shield before taking off the crankshaft pulley. Remove the screws and nuts holding the timing belt cover to the cylinder head and block, then take off both halves of the timing belt cover. Position the number one piston at Top Dead Center on the compression stroke, ensuring the marks on the crankshaft and intermediate shaft sprocket are aligned, and the arrows on the camshaft sprocket line up with the bearing cap parting line. Loosen the center bolt to release tension from the timing belt and remove it along with the tensioner. If equipped with air conditioning, remove the compressor and bracket, and support the engine with a block of wood and a floor jack to remove the engine mount. Inspect the tensioner pulley for roughness and excessive play, and replace if necessary. Check the timing belt for cracks, wear, and contamination, replacing it if damaged. Visually inspect the sprockets for wear and damage, replacing any that are compromised, and check for leaking engine oil below each sprocket, replacing seals as needed. For sprocket removal, hold the intermediate shaft sprocket with a pin spanner while loosening the bolt, then pull the sprocket off. Use a puller to remove the crankshaft sprocket and detach the camshaft sprocket by holding it and removing the bolt. Ensure the Woodruff keys are in place before installing the crankshaft and intermediate shaft sprockets, aligning the marks. Install and tighten the crankshaft sprocket bolt, followed by the intermediate shaft sprocket bolt, ensuring the marks remain aligned. Install the camshaft sprocket and bolt, tightening it to the specified torque while aligning the triangles on the sprocket hub with the camshaft bearing cap parting line. When installing the timing belt, ensure the marks on the sprockets are aligned, install the belt without turning any sprockets, and install the tensioner pulley with the bolt finger tight. With assistance, apply tension to the timing belt and temporarily tighten the tensioner bolt, measuring the deflection to approximately 5/16-inch. Turn the crankshaft two complete revolutions clockwise to align the belt on the pulleys, rechecking the belt deflection and tightening the tensioner pulley. Finally, verify the camshaft timing mark with the timing belt cover installed and the number one piston at TDC, ensuring the small hole in the camshaft sprocket is centered in the timing belt cover hole, and complete the installation in reverse order of removal.

When removing the timing belt, ensure the engine is cool and position the number one piston at Top Dead Center. Disconnect the negative battery terminal and remove the accessory drive belts and spark plugs. Set the parking brake, block the rear wheels, and securely raise the front of the vehicle on jack stands. Remove the right inner fender splash shield if equipped, then loosen the large bolt in the center of the crankshaft damper pulley using a screwdriver or bar to keep it stationary. Install a 3-jaw puller to remove the damper pulley, ensuring to use the proper insert to protect the crankshaft threads. Drain the engine coolant, remove the ground strap from the engine mount bracket, and take out the power steering pump and bracket without disconnecting the fluid lines. Support the engine with a floor jack under the oil pan, then remove the right engine mount and engine mount bracket. Remove the timing belt cover and ensure the camshaft sprocket timing marks are aligned before releasing tension on the timing belt. Carefully slip the timing belt off the sprockets, keeping it away from oil or water if planning to reuse it. Inspect the timing belt and related components for wear or damage, replacing as necessary. For installation, compress the tensioner pin for hydraulic tensioners before installation, confirm the alignment of the camshaft sprocket timing marks, and position the crankshaft timing sprocket correctly. Install the timing belt, ensuring proper tension and alignment of the marks, and recheck the tensioner settings. After reinstalling all components in reverse order, start the engine and conduct a road test.

Align the timing marks on the crankshaft and camshaft sprockets before removing the timing belt. If reusing the belt, mark the direction of rotation.

Turn the crankshaft clockwise two full revolutions to return the number one piston to TDC, checking for any resistance that may indicate contact between the pistons and valves.