How do I replace a Serpentine Belt on a 1994 E420?

Below is the master help link provided to go through belt routing diagram:---Timing belt, drive belt, serpentine belt, accessory belt, fan belt, engine belt routing diagrams for all types of car models?
Click the link below: ----

http://carbeltrouting.blogspot.in/2012/02/timing-beltdrive-beltserpentine.html
----------This will help. Thanks.

The 1994 Oldsmobile 88 does not have a cam/timing belt. It uses a chain so I am assuming you are talking about the serpentine belt. There should be a routing diagram of the serpentine belt under the hood somewhere. May be on the underside of the hood or on the radiator mount. Also can be found in your owner's manual. If the belt came of you need to find out why. Either the belt is worn out or the tensioner is defective or both. I would suggest you replace the belt for sure. Here is a diagram of the routing of the belt on your 1994 Olds 88 with 3.8 V6.

2.8L and 3.1L Air Pump Belt

1. Disconnect the negative battery cable.
2. Loosen the air pump.
3. Remove the worn belt.

To install:

1. Adjust the belt to specifications and tighten the pump mounting bolts.
2. Connect the negative battery cable.

2.3L Power Steering Belt

1. Disconnect the negative battery cable.
2. Loosen the adjustment bolts.
3. Remove the power steering belt from the pulley.

To install:

1. Route the belt around the pulley.
2. Adjust the belt to specifications, then tighten the adjustment bolts.
3. Connect the negative battery cable.

See Figures 6 through 15

Fig. Fig. 6: Unfasten the retaining bolts...

Fig. Fig. 7: ... then remove the serpentine belt guard

Fig. Fig. 8: ...

Fig. Fig. 9: ... then remove the serpentine belt

1. Remove the belt. Clean the accessory drive belt surfaces.

Fig. Fig. 10: Serpentine drive belt routing-2.2L engine

Fig. Fig. 11: Removal and installation of the serpentine belt-2.3L engine

Fig. Fig. 12: Serpentine belt routing-2.5L engine with and without A/C

Fig. Fig. 13: Use an 18mm box end wrench on the pulley nut to rotate the tensioner on the 3.8L engine

Fig. Fig. 14: in. breaker bar to rotate the tensioner

Fig. Fig. 15: On the 3.4L, use a box end wrench, then rotate the tensioner clockwise and remove the serpentine belt

Remove the belt guard or coolant recovery reservoir as required.

Try putting the belt on the alternator then slide it under the idler pulley last.

Hi Charterdhear,
The proper name is the serpentine accessory drive belt.(Or serpentine belt for short). One belt drives all the components on the engine. The car you are asking about has different engine sizes available.You will need to know the size when ordering the part. They will also ask if you have air conditioning. Let me know if you need any other information. Thanks,Chuck

if you buy your belt from Autozone the belt routing is on the box

the only water deflection dodge gave these cars was directly under the pully system if it has this and is still throwing belts check the tensioner

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Click on the link below, enter the year,make,model and engine of your car, then click on the Belt Diagram link to get a diagram for your serpentine belt. Best of luck!
Greg

http://www.mvreader.com/multiview/dayco/index.php?bgInterchange=1&l=n

Locate the automatic belt tensioner, it should have a black plastic pulley on it. Insert a 1/2 inch breaker bar in the hole thats on the tensioner, and pull to relieve the tension on the belt. Slip old belt off the pulley and slowly release the force you have on the bar untill it stops moving. Route new belt, and move tensioner with bar to gain needed slack to get the belt on, Release tension, and remove bar. makeing sure new belt is in alignment.
Be careful...watch for pinch points, around your fingers and hands when performing this job.
Also, check the pulleys and idlers for wear before installing the new belt. They will wobble if the bearings are worn and should be replaced.
Good luck, hope this helps.