How do i release tension on tensioner to replace the drive belt on my 850 wagon?

which engine option, you do know belts are not same on all engines right? fact.
2.7L V6 or bigger? IDN.

same on all cars. (answering in generic form do to above)
loosen the tension-er.
take off old
put back new
and if not a spring tension-er,set proper tension
the fSM cover all this.
why not read the manual, RTM?

here is one example (get the book, RTM or see alldata.com)

2008 xl7 engine


Removal Procedure

Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .

Install the engine support fixture. Refer to Engine Support Fixture .

Remove the engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement - Right Side .

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

Remove the engine splash shield. Refer to Engine Splash Shield Replacement - Right Side .

Remove the right side engine mount bracket. Refer to Engine Mount Bracket Replacement - Right Side .

Lower the vehicle


Rotate the drive belt tensioner clockwise to release the drive belt tension.

Slide the drive belt off of the belt idler pulley (1).

Slowly release the drive belt tensioner.

Remove the drive belt from the accessory drive pulleys.

end remove
beg, install



Install the drive belt to the crankshaft pulley, the tensioner and the generator.

Rotate the drive belt tensioner clockwise.

Install the drive belt to the idler pulley (1).

NOTE

Important: Ensure the drive belt is properly aligned and seated into the grooves of the accessory drive pulleys.

Slowly release the drive belt tensioner.

Raise the vehicle.

Install the right side engine mount bracket. Refer to Engine Mount Bracket Replacement - Right Side .

Install the engine splash shield. Refer to Engine Splash Shield Replacement - Right Side .

Lower the vehicle.

Install the engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement - Right Side .

Remove the engine support fixture. Refer to Engine Support Fixture .

Install the the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
end.

you ask here. Please rate highly

SECTION 303-05: Accessory Drive 1998 Escort/Tracer Workshop Manual
REMOVAL AND INSTALLATION Belt -2.0L SPI Removal

1. Relieve the drive belt (8620) tension.
   • Use a (A) ratchet or breaker bar inserted in the square hole in the drive belt tensioner flange.
   • Rotate the (B) drive belt tensioner (6B209) in a clockwise motion to release belt tension.

1. Raise and support the vehicle. For additional information, refer to Section 100-02 .

1. Remove the engine splash shield.

1. Remove the drive belt from the accessory drive belt routing pulley (6C348) and then the remaining accessory pulleys.

Installation

1. Position the drive belt over the accessory pulleys. Raise and support the vehicle if necessary; refer to Section 100-02 .

1. Install the engine splash shield.

1. Rotate the drive belt tensioner in a clockwise motion.

1. Slip the drive belt under the belt idler pulley (8678) and release the tool. Remove the tool from the drive belt tensioner.

1. Accessory Drive-With A/C

1. Accessory Drive-Without A/C

---------------------------------------------------------------------------------------------------
Belt -2.0L Zetec Removal

1. Raise the vehicle on a hoist; refer to Section 100-02 .

1. Use a 13 mm wrench to rotate the drive belt tensioner (6B209) in a clockwise motion.

1. Remove the drive belt (8620).

Installation

1. Position the drive belt on all the pulleys and the drive belt tensioner.

Item Part Number Description 1 10300 Generator 2 19A216 Drive Belt Idler Pulley 3 3D673 Power Steering Pump Pulley 4 8509 Water Pump Pulley 5 6B209 Drive Belt Tensioner 6 19703 A/C Compressor 7 6316 Crankshaft 8 19A216 Drive Belt Idler Pulley 9 8620 Accessory Drive Belt

1. Rotate the drive belt tensioner in a clockwise motion.

1. Install the drive belt and gently release the drive belt tensioner.
   • Run the engine for several minutes to seat the belt into the pulley grooves.

I have two Mercedes - one is 2000 E320 Wagon; other is 1999 E320 Sedan.

I replaced the serpentine belt on my 2000 Wagon today at 92,000 miles. I found that the Motorcraft JK6-947 could be purchased on Ebay for $12.99 plus $6.20 shipping. The old belt was a Goodyear Gatorback 4060940. My 1999 sedan has a Mercedes Benz 011 997 97 92 6K2390 EM7117 Gates belt made in Spain.

Here are the details of replacing the belt.

On the 2000 E320, a 17 mm bolt just under the belt going to the tension pulley will release the belt tension when turned counterclockwise. Removal of the belt was easy after using a 17 mm deep socket wrench similar to a spark plug socket. I made turning the bolt very easy by slipping a 4' pipe over the socket wrench handle. It is advisable to put the new belt LAST on the idler pulley that contacts the belt only on the smooth side.

You do not need todisturb theButton Torx bolt in the center of the tension pully.

The 1999 E320 uses a 15 mm bolt in the CENTER of the tension pulley. Otherwise the installation is the same as the 2000 E320.

Removal & Installation

1. Rotate the drive belt tensioner clockwise and remove the drive belt.
   WARNING Never suddenly let go of the tensioned idler pulley. The force of the spring pressure suddenly released may damage the idler pulley mechanism. Always release the spring pressure gradually.
   
   
   

   Fig. Rotate the belt tensioner to relieve tension on the belt-4.6L engine shown, others similar
   

To install:

1. Route the belt over the pulleys making sure all the grooves in the pulleys and the belt line up correctly. Refer to the accessory belt routing section of this manual.
2. Rotate belt tensioner clockwise and slip drive belt over idler pulley on tensioner.

1. Rotate the drive belt tensioner clockwise and remove the drive belt.
   WARNING Never suddenly let go of the tensioned idler pulley. The force of the spring pressure suddenly released may damage the idler pulley mechanism. Always release the spring pressure gradually.
   
   
   

   Fig. Rotate the belt tensioner to relieve tension on the belt-4.6L engine shown, others similar
   

To install:

1. Route the belt over the pulleys making sure all the grooves in the pulleys and the belt line up correctly. Refer to the accessory belt routing diagrams above.
2. Rotate belt tensioner clockwise and slip drive belt over idler pulley on tensioner.

If for any reason, the tensioner is crooked, replace it!!! Also, install the belt with the writing facing you like you are trying to read a book. This WILL (a trick I learned at Mercedes) prevent even a new belt from squeeling!!

2002 Honda Civic SI 2.0L MFI VTEC DOHC 4cyl

1. Place a long-handled, boxed-end wrench or a belt tension release tool (A) on the drive belt auto-tensioner from above the engine. Slowly turn the wrench in the direction shown to release the tension, then remove the drive belt.
   WARNING This is a hydraulic type auto-tensioner; you must turn the wrench slowly.
2. Install the new belt in the reverse order of removal.

Fig. Removing the serpentine belt-2006 Civic with 2.0L engine shown




Fig. Move the auto tensioner (A) to remove the serpentine belt (B)-S2000



Fig. Move the auto-tensioner (A) using the belt tension release tool to relieve tension from the drive belt (B), and remove the drive belt-Accord with 2.4L engine



Fig. Move the auto-tensioner (A) using the belt tension release tool to relieve tension from the drive belt (B), then remove the drive belt-Accord with 3.0L engine

I hope helps with this. Good luck.

loosen appropriate pulley tensioner by loosening the nut in the centre of the correct pulley,back off tensioner and pulley will loosen on belt,change belt and do the opposite

Don't know about the layout of the Volvo belts; however, there are basically two ways to release and restore tension on belts.

The old way involved components that could be moved in and out to allow the new belt to be put in place and then have tension restored to the belt. A bolt in an elongated hole allowed this movement. The component that could be moved could be the alternator or power steering pump. The sequence was: loosen the bolt, move the component, install the new belt, move the component back till the belt is tensioned, and tighten the bolt.

The new system involves a tensioner that holds the belt in position. These tensioners can be moved in one direction to allow the new belt to be installed. After the belt is in place, the tensioner is released and it moves back to a position where it keeps the proper tension on the belt.

Removal & Installation

1. Raise and support the vehicle.
   
2. Remove the engine splash shield.
   
3. Rotate the drive belt tensioner clockwise to release the drive belt tension.
   
4. Remove the drive belt from the alternator.
   
5. Slowly release the drive belt tensioner.
   
6. Remove the drive belt from the accessory drive pulleys.
   

To install:

1. Install the drive belt to the accessory drive pulley.
   
2. Rotate the drive belt tensioner clockwise.
   
3. Install the drive belt to the alternator.
   
4. Ensure the drive belt is properly aligned and seated into the grooves of the accessory drive pulleys.
   
5. Slowly release the drive belt tensioner
   
6. Install the engine splash shield.
   
7. Lower the vehicle.
   

Accessory drive belt routing—1.5L engine


Accessory drive belt routing—2.0L engines


Accessory drive belt routing—2.4L engines


Accessory drive belt routing—2.5L and 2.7L engines


Accessory drive belt routing—3.0L and 3.5L engine

I hope you've solved the problem by now, but there are alignment marks on the crank shaft (top pulley), idler (lower side), and cam shaft (smaller, bottom pulley) which should be aligned with stationary marks on the timing belt rear cover.

The belt has marks that align with the aforementioned marks (lines). The double marks on the belt align with the camshaft marks and the single marks with the others.

Loosen the tensioner clamp (nut) to allow the spring loaded tensioner to press on the belt and retighten the nut.

Rotate the crank shaft (clockwise, probably two revolutions) and make sure the pulley marks realign to the marks on the cover (they don't have to realign with the marks on the belt).

Rotate the crank shaft a full revolution once the belt is on and check that alignment is preserved.

Periodically loosen and retension the tensioner nut (access through a hole in the cover) to ensure that tension is maintained as the belt relaxes.

will need a special tool for job.(belt tensioner pulley tool)
release tension with tool on belt tensioner.then remove old sepentine belt,then install new belt using same method