Need to know how to remove a crankshaft to remove a timing belt.

Inspect/Replace Follow the manufacturer's recommendations for the replacement interval for the belt. This varies from 20,000 to 60,000 miles. Some manufacturers have longer intervals. When no recommendation is made, timing belts should be changed every four years.
WARNING If a belt slips or breaks it can cause interference to the engine, resulting in costly damage. Replacing A Timing Belt On An OHC Engine
Disconnect the negative cable from the battery prior to removing and replacing the timing belt.
Carefully remove the timing cover. Be careful not to distort or damage it while pulling it up. With the cover removed, check the immediate area around the belt for wires and other obstacles. If some are found, move them out of the way.
Align the timing marks on the camshaft's sprocket with the mark on the cylinder head. If the marks are not obvious, use a paint stick or chalk to clearly mark them.
Carefully remove the crankshaft timing sensor and probe holder.
Loosen the adjustment bolt on the belt tensioner pulley. It is normally not necessary to remove the tensioner assembly.
Slide the belt off the crankshaft sprocket. Do not allow the crankshaft pulley to rotate while doing this.
Art courtesty of Delmar - Thomson Learning. To remove the belt from the engine, the crankshaft pulley must be removed. Then the belt can be slipped off the crankshaft sprocket.

https://www.google.com/#q=remove+crankshaft+sensor+98+doddge+stratus+2.4

.6L (VIN 3) & 2.0L Engines

1. Before servicing the vehicle, refer to the Precautions Section.
   

2. Remove or disconnect the following:
   

   • Negative battery cable
     

   • Engine cover
     

   • Right-hand front wheel
     

   • Right-hand wheel well side cover
     

   • Accessory drive belts
     

   • Water pump pulley
     

   • Timing belt upper cover
     

3. Turn the crankshaft pulley so cylinder No. 1 is at Top Dead Center (TDC). Align the pulley groove with the timing mark "T" of the timing belt cover.
   

4. Remove or disconnect the following:
   

   • Crankshaft pulley
     

   • Crankshaft flange
     

   • Lower timing belt cover
     

   • Timing belt tensioner
     

   • Timing belt To install:Align the timing marks of the camshaft and crankshaft sprockets to ensure the No. 1 cylinder is at TDC.Temporarily install the timing belt tensioner.Install the timing belt over the crankshaft sprocket, then inside the idler pulley, over the camshaft sprocket and then inside the timing belt tensioner.Apply tension to the timing belt by turning the tensioner in the clockwise direction so there is no slack in the belt on the tension side.Tighten the tensioner mounting bolts to 20 ft. lbs. (27 Nm).Check the timing belt tension as follows:
     

1. • 1.6L (VIN 3) engine: Push the tension side of the belt in horizontally with a moderate force, the timing belt cog end is approximately 1/2 of the tensioner mounting bolt head radius away from the bolt head center.
     

   • 2.0L engine: Push the tension side of the belt in horizontally with a moderate force, the timing belt cog end sags approximately 0.16-0.24 inches (4-6 mm).
     

2. Turn the crankshaft two turns in the clockwise direction and realign the crankshaft sprocket and camshaft sprocket timing marks.
   

Hope this helps you, you also might want to replace the water pump, due to it's timing belt driven.

Timing Belt Removal & Installation 3.0L Engine To Remove:
Exploded view of the timing belt and sprocket assembly (3.0L engine)

1. Disconnect the negative battery cable.
2. Remove the accessory drive belts. Remove the engine mount insulator from the engine support bracket.
3. Remove the engine support bracket. Remove the crankshaft pulleys and torsional damper. Remove the timing belt covers.
4. Rotate the crankshaft until the sprocket timing marks are aligned. The crankshaft sprocket timing mark should align with the oil pump timing mark. The rear camshaft sprocket timing mark should align with the generator bracket timing mark and the front camshaft sprocket timing mark should align with the inner timing belt cover timing mark.
5. If the belt is to be reused, mark the direction of rotation on the belt for installation reference. Mark the direction of travel for the timing belt for correct installation
   
6. Loosen the timing belt tensioner bolt and remove the timing belt.
7. If necessary, remove the timing belt tensioner. Turn the center tensioner pulley bolt until the timing belt has enough slack . . .
   . . . then slide the timing belt off of the camshaft sprockets
   
8. Remove the crankshaft sprocket flange shield and crankshaft sprocket.
9. Hold the camshaft sprocket using spanner tool MB990775 or equivalent, and remove the camshaft sprocket bolt and washer. Remove the camshaft sprocket.

To Install:

1. Install the camshaft sprocket on the camshaft with the retaining bolt and washer. Hold the camshaft sprocket using spanner tool MB990775 or equivalent, and tighten the bolt to 70 ft. lbs. (95 Nm).
2. Install the crankshaft sprocket.
3. If removed, install the timing belt tensioner and tensioner spring. Hook the spring upper end to the water pump pin and the lower end to the tensioner bracket with the hook out.
4. Turn the timing belt tensioner counterclockwise full travel in the adjustment slot and tighten the bolt to temporarily hold it in this position.
5. Rotate the crankshaft sprocket until its timing mark is aligned with the oil pump timing mark.
6. Rotate the rear camshaft sprocket until its timing mark is aligned with the timing mark on the generator bracket.
7. Rotate the front (radiator side) camshaft sprocket until its mark is aligned with the timing mark on the inner timing belt cover.
8. Install the timing belt on the crankshaft sprocket while keeping the belt tight on the tension side. NOTE: If the original belt is being reused, be sure to install it in the same rotational direction.
   
9. Position the timing belt over the front camshaft sprocket (radiator side). Next, position the belt under the water pump pulley, then over the rear camshaft sprocket and finally over the tensioner. CAUTION
   If any binding is felt when adjusting the timing belt tension by turning the crankshaft, STOP turning the engine, because the pistons may be hitting the valves.
   Rent or borrow the special tool to hold the camshaft sprockets steady . . .
   . . . while loosening the center retaining bolt on the camshaft pulley, then . . .
   . . . remove the camshaft sprocket from the end of the camshaft
   Timing belt tensioner and spring positions
   Timing belt routing and timing mark locations
   
   
10. Apply rotating force in the opposite direction to the front camshaft sprocket (radiator side) to create tension on the timing belt tension side. Check that all timing marks are aligned.
11. Install the crankshaft sprocket flange.
12. Loosen the tensioner bolt and allow the tensioner spring to tension the belt.
13. Rotate the crankshaft two full turns in a clockwise direction. Turn the crankshaft smoothly and in a clockwise direction only.
14. Again line up the timing marks. If all marks are aligned, tighten the tensioner bolt to 250 in. lbs. (28 Nm). Otherwise repeat the installation procedure.
15. Install the timing belt covers. Install the engine support bracket. Tighten the support bracket mounting bolts to 35 ft. lbs. (47 Nm).
16. Install the engine mount insulator, torsional damper and crankshaft pulleys. Tighten the crankshaft pulley bolt to 112 ft. lbs. (151 Nm).
17. Install the accessory drive belts.
18. Reconnect the negative battery cable.
19. Run the engine and check for proper operation.

1. Remove or disconnect the following:
   
   
2. Negative battery cable Accessory drive belt and tensioner Timing belt cover Right front wheel Right inner splash shield Crankshaft pulley
   
3. Align the timing marks.

1. Removing Timing Belt

1. Loosen the timing belt tensioner bolt (1).
2. Use an 8mm Allen wrench, and turn the tensioner (2) counterclockwise 1 / 4 turn.
3. Insert a 1 / 8 inch drill bit in the hole (3) to lock the belt tensioner in place.
4. Remove the timing belt (4).
   
   To Install :
   
   
5. Install the timing belt in a counterclockwise direction starting at the crankshaft.
   
6. Remove the drill bit to unlock the timing belt tensioner.
   
7. Rotate the crankshaft two complete turns and check that the timing marks align.
   
8. Tighten the tensioner bolt to 15-22 ft. lbs. (20-30 Nm).
   
9. Reinstall or connect the following:
   
   Crankshaft pulley. Tighten the bolt to 81-96 ft. lbs. (110-130 Nm). Right inner splash shield Right front wheel Timing belt cover Accessory drive belt and tensioner Negative battery cable
10. Start the engine and check for proper operation
    

Timing chain is only available in the 3.3L and 3.8L engines.

Yours has a belt. (if you're SURE its a 3.0L)

Here is the info on changing it...

3.0L Engine
The timing belt can be inspected by removing the upper front outer timing belt cover.
Working on any engine (especially overhead camshaft engines) requires much care be given to valve timing. It is good practice to set the engine up at TDC No. 1 cylinder firing position before beginning work. Verify that all timing marks on the crankshaft and camshaft sprockets are properly aligned before removing the timing belt and starting camshaft service. This serves as a point of reference for all work that follows. Valve timing is very important and engine damage will result if the work is incorrect.

1. Disconnect the negative battery cable.
2. Remove the accessory drive belts. Remove the engine mount insulator from the engine support bracket.
3. Remove the engine support bracket. Remove the crankshaft pulleys and torsional damper. Remove the timing belt covers.
4. Rotate the crankshaft until the sprocket timing marks are aligned. The crankshaft sprocket timing mark should align with the oil pump timing mark. The rear camshaft sprocket timing mark should align with the generator bracket timing mark and the front camshaft sprocket timing mark should align with the inner timing belt cover timing mark.
5. If the belt is to be reused, mark the direction of rotation on the belt for installation reference.
6. Loosen the timing belt tensioner bolt and remove the timing belt.
7. If necessary, remove the timing belt tensioner.
8. Remove the crankshaft sprocket flange shield and crankshaft sprocket.
9. Hold the camshaft sprocket using spanner tool MB990775, or equivalent, and remove the camshaft sprocket bolt and washer. Remove the camshaft sprocket.
10. To install:
    
11. Install the camshaft sprocket on the camshaft with the retaining bolt and washer. Hold the camshaft sprocket using spanner tool MB990775, or equivalent, and tighten the bolt to 70 ft. lbs. (95 Nm).
12. Install the crankshaft sprocket.
13. If removed, install the timing belt tensioner and tensioner spring. Hook the spring upper end to the water pump pin and the lower end to the tensioner bracket with the hook out.
14. Turn the timing belt tensioner counterclockwise full travel in the adjustment slot and tighten the bolt to temporarily hold it in this position.
15. Rotate the crankshaft sprocket until its timing mark is aligned with the oil pump timing mark.
16. Rotate the rear camshaft sprocket until its timing mark is aligned with the timing mark on the generator bracket.
17. Rotate the front (radiator side) camshaft sprocket until its mark is aligned with the timing mark on the inner timing belt cover.
18. Install the timing belt on the crankshaft sprocket while keeping the belt tight on the tension side.
19. Position the timing belt over the front camshaft sprocket (radiator side). Next, position the belt under the water pump pulley, then over the rear camshaft sprocket and finally over the tensioner.
20. Apply rotating force in the opposite direction to the front camshaft sprocket (radiator side) to create tension on the timing belt tension side. Check that all timing marks are aligned.
21. Install the crankshaft sprocket flange.
22. Loosen the tensioner bolt and allow the tensioner spring to tension the belt.
23. Rotate the crankshaft 2 full turns in a clockwise direction. Turn the crankshaft smoothly and in a clockwise direction only.
24. Align the timing marks. If all marks are aligned, tighten the tensioner bolt to 250 inch lbs. (28 Nm). Otherwise repeat the installation procedure.
25. Install the timing belt covers. Install the engine support bracket. Tighten the support bracket mounting bolts to 35 ft. lbs. (47 Nm).
26. Install the engine mount insulator, torsional damper and crankshaft pulleys. Tighten the crankshaft pulley bolt to 112 ft. lbs. (151 Nm).
27. Install the accessory drive belts and adjust them to the proper tension.
28. Reconnect the negative battery cable.
29. Run the engine and check for proper operation. Road test the vehicle.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question

Timing belt needs to be replaced every 100000 km at the most . Do you know when it was replaced last ?
Did they remove the front pulley (The one on the crankshaft)?
The Timing belt and AUX belts are not related to the sump but they are related to the crankshaft pulley , Depending on the type of repair carried out they may have removed the pulley in order to replace the crankshaft front oil seal.If I was replacing a crankshaft oilseal due to oil leaking I would have fitted a new Timing belt as well as Tensioner , Idler/s , Water pump (if driven by timing belt) as well as the AUX belts as Oil can damage rubber .
Hope this makes sense to you ?
Looking forward to your reply
Regards
George

Ignore smart a$$ comments.
Disconnect negative battery terminal.
Remove front right wheel.
Remove splash guard.
Place jack under engine.
Remove left engine support bolts from body.
Remove engine support plate bolts from engine.
Unbolt air conditioner pump and move it out of the way.
Get under vehicle and remove steering pump bolts and move it out of the way.
Remove 6 crankshaft pulley bolts, should be 12mm.
The engine support bracket shoud come off now.
Remove the main crankshaft bolt.
Remove crankshaft dampener.
Remove the timing cover bolts and take off the covers.
Take off the old belt & replace with a new one, don't use a previously used belt.
Make sure the belt tensioner is installed correctly.
Put all the stuff back on.
Get a Haynes manual, pages 3-41.

A factory service manual would help, but I'm assuming that if you had one, you probably wouldn't be on this site.

To set the timing, you need to first perform the obvious: remove the accessory drive belts, cam pulley covers, and engine fan and hub. Next you'll need to rotate the engine by hand until the timing marks on the camshaft sprockets and crankshaft are aligned with their corresponding stationary marks. The 0 degree mark on the lower timing belt cover is the timing mark for the crankshaft pulley. There is a mark (small, vertical formed indentation) for the left camshaft pulley on the backing plate behind the pulley near the 1 o` clock position. The same mark exists for the right camshaft pulley only it is on the backing plate near the 8 o`clock position (making it difficult to see). With the crankshaft placed at the zero mark, you can observed where the timing discrepancy exists.

(TIP: Once the right camshaft timing is properly lined up, etch an additional mark on the pulley's face and the backing plate at the 12 o`clock position. This will make it easier to align the pulley for furture adjustments and repairs)

To set the timing correctly, move the crankshaft pulley to 12 deg. BTDC. Being careful to not disturb the position of the crankshaft once it has been moved to that position, remove the crankshaft pulley, lower timing belt cover, timing belt tensioner, and timing belt. Compress the timing belt tensioner and if the original ring pin isn't available to retain the tensioner a small allen wrench can be used to achieve the same results. Line up both camshaft marks and reinstall the timing belt and timing belt tensioner (do not remove the timing belt tensioner tool used to maintain the tensioner piston in a compressed position). When installing the timing belt, be sure to allow the least amount of slack to exisit between the left camshaft pulley and the crankshaft sprocket, but without moving the pulleys.

Next, remove the timing belt tensioner piston retention tool and mount the lower timing belt cover and crankshaft pulley (without fully installing them). Rotate the crankshaft pulley to the 0 deg. mark. If done correctly, moving the crankshaft pulley from 12 deg. BTDC to 0 deg. will remove all remaining slack from the timing belt assembly and the camshaft pulleys and crankshaft pulleys will be lined up with their corresponding marks. Once proper timing has been achieved, install all removed parts.

(Another TIP: I hope it's not necessary, but in case it is, I'll remind you that proper torque of all bolts are necessary as this is an all aluminum engine. Stripping out bolts holes due to over-tightening bolts occurs very easily and become very annoying to deal with [e.g. alternator belts not being able to be tightened completely and constantly squealing every few days, etc.])