Question about 2002 Porsche 911

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Belt tension I would like to know how to tell if my belt is in need of adjustment on my 2002 911 Turbo.

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  • Porsche Master
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Generally its self adjust by seat driver adjust

Posted on Jul 16, 2010

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How to change altenater belt on 87' cabi



INSPECTION

Inspect the belts for signs of glazing or cracking. A glazed belt will be perfectly smooth from slippage, while a good belt will have a slight texture of fabric visible. Cracks will usually start at the inner edge of the belt and run outward. All worn or damaged drive belts should be replaced immediately. It is always best to replace all drive belts at one time, as a preventive maintenance measure, during this service operation.


CHECKING TENSION AND ADJUSTMENT

See Figure 1
The belt tension on most driven components is adjusted by moving the component (alternator, power steering pump etc.) within the range of a slotted bracket. Some brackets (toothed) use a rack and pinion mechanism which moves the alternator side-to-side to adjust the belt tension. With this configuration, no prying tools are required. On Quantum (except 5 cylinder) and Fox models, the air conditioner compressor drive belts are adjusted by varying the number of discs (shims) between the halves of the crankshaft pulley. Before adjusting the belt tension on any engine, look at the mounting and determine what kind of bracket is used.
To check belt tension, push in on the drive belt about midway between the crankshaft pulley and the driven component. If the belt is less than 39.4 in. (1m) long, it should deflect between 0.80-0.120 in. (2-5mm). For longer belts, it should deflect between 0.40-0.060 in. (10-15mm). Belt size is usually printed on the back side of the belt. If it can't be read, it's probably time to replace it.


0900c1528026638b.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: To check belt tension, push in on the drive belt about midway between the crankshaft pulley and the driven component
Slotted Brackets
See Figures 2, 3 and 4

  1. Loosen the adjustment nut/bolt in the slotted bracket. Slightly loosen the pivot bolt.
  2. Pull (don't pry) the component outward to increase tension. Push inward to reduce tension. Tighten the adjusting nut/bolt and the pivot bolt.



0900c1528026638c.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Alternator mounting with slotted brackets

  1. Components, such as the power steering pump and some air conditioner compressors, may be mounted with a double slotted adjusting bracket using a threaded bolt and locknut to adjust and maintain tension. Loosen the locknut(s) and slightly loosen the bolt(s) in the slotted groove(s). Turn the threaded adjustment bolt(s) in or out to gain correct tension. Tighten locknut(s) and slotted bracket bolt(s).
  2. Recheck the drive belt tension, readjust if necessary.



0900c1528026638d.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 3: Some components use a double slotted adjusting bracket with a threaded bolt and locknut to adjust and maintain tension. Loosen the locknut (shown) before adjusting the tension bolt


0900c1528026638e.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 4: An extension is helpful when adjusting the tension bolt. Be sure to loosen the nut/bolt on the rear slotted bracket first
Toothed Brackets
See Figures 5 and 6

  1. Loosen the tension bolt and the alternator pivot bolt. These bolts should be loosened until the alternator swings freely under its own weight.



0900c1528026638f.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 5: Loosen the tension bolt (shown) and the alternator pivot bolt until the alternator swings freely under its own weight

  1. Adjust the V-belt by turning the nut on the tension bolt while checking the belt deflection with your thumb.
  2. Once the proper tension is achieved, tighten the tension bolt to 26 ft. lbs. (35 Nm). Tighten the pivot bolt to 15 ft. lbs. (20 Nm).
  3. Recheck the drive belt tension, readjust if necessary.



0900c15280266390.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 6: Adjust the V-belt by turning the nut on the tension bolt
Split Pulley
See Figure 7
On Quantum (except 5 cylinder) and Fox models, the air conditioner compressor drive belts are adjusted by varying the number of discs (shims) between the halves of the crankshaft pulley.

  1. Remove the nuts/bolts securing the tensioner plate and crankshaft pulley halves.
  2. Add or remove the amount of spacer discs between the pulley halves until the belt tension is correct.



0900c15280266391.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 7: Belt adjusting shims on Quantum (except 5 cylinder) and Fox models. Extra shims are stored behind the tensioner plate on Fox and turbo diesel Quantums (shown)
If there are any shims left over, do not throw them away. On Fox and turbo diesel Quantum models, store the extra shims in front of the split pulley (behind the tensioner plate). On Quantums with 4 cylinder gas engines, store the extra shims behind the split pulley (in front of the crankshaft hub).

  1. Secure the pulley halves. Torque the pulley nuts or bolts to 15 ft. lbs. (20 Nm).


REMOVAL & INSTALLATION

If a belt must be replaced, the driven unit must be loosened and moved to its extreme loosest position (usually by moving it toward the center of the motor). After removing the old belt, check the pulleys for dirt or built-up material which could affect belt contact. Carefully install the new belt, it may appear to be just a little too small to fit over the pulley flanges. Fit the belt over the largest pulley (usually the crankshaft pulley at the bottom center of the motor) first, then work on the smaller one(s). Gentle pressure in the direction of rotation is helpful. Some belts run around a third or idler pulley, which acts as an additional pivot in the belt's path. It may be possible to loosen the idler pulley as well as the main component, making your job much easier. Depending on which belt(s) you are changing, it may be necessary to loosen or remove other interfering belts to get at the one(s) you want. Some models have a front engine mount installed through the air conditioner compressor belt circle. Support the engine and remove the mount prior to belt removal and installation.
When buying replacement belts, remember that the fit is critical according to the length of the belt, the width of the belt, the depth of the belt and the angle or profile of the V shape (always match up old belt with new belt if possible). The belt shape should exactly match the shape of the pulley; belts that are not an exact match can cause noise, slippage and premature failure.
After the new belt is installed, adjust it for proper tension. This is sometimes a three or four-handed job; you may find an assistant helpful. Make sure that all the bolts you loosened are retightened and that any other loosened belts also have the correct tension. A new belt can be expected to stretch a bit after installation so be prepared to re-adjust your new belt.
After installing a new belt, run the engine for about 5 minutes and then recheck the belt tension.

May 19, 2012 | 1987 Volkswagen Cabriolet

1 Answer

Trying to adjust the tensioner pulley to put the belt back on need tyo know where the adjustment is


Ther is no adjustment it is a spring loaded tensioner ,you have to pull back on the tensioner to install the belt then when you release it the tensioner keeps pressure on the belt

Sep 22, 2011 | 1999 Ford Escort

1 Answer

I need a diagram to see were my tension-er is


I don't have the figure for your car, but the below figure shows how to remove the A/C belt.
the other belts should have a simple slot in the bracket for adjusting. If you have more questions, let us know.

6f92dc6.jpg
3.0L SOHC Diamante
  1. Disconnect the negative battery cable.
  2. Loosen the lockbolt on the face of the A/C tensioner pulley.
  3. Turn the adjusting bolt of the A/C tensioner pulley to loosen the tension of the A/C belt.
  4. Remove the A/C compressor belt.
  5. Loosen the locknut on the face of the power steering/alternator tensioner pulley.
  6. Turn the adjusting bolt of the tensioner pulley to loosen the tension of the belt.
  7. Remove the power steering/alternator belt.
To install:
  1. Install the power steering/alternator belt first and then the A/C compressor drive belt.
  2. Adjust the belts to the proper tension by turning the adjusting bolts and tighten pulley fixing nut/bolt.
  3. Tighten the mounting nut of the power steering/alternator tensioner pulley to 36 ft. lbs. (50 Nm).

NOTE The manufacturer does not provide a torque specification for the bolt that secures A/C tensioner pulley.
  1. Connect the negative battery cable.

Oct 06, 2010 | 1994 Mitsubishi Diamante

1 Answer

How do you adjust a tension belt on a 1999 ford mustang


you don't adjust it. theres a pulley that keeps the tension on the belt. read the handbook and it will show you where to look for the arrow that tells you between this mark and that mark is the right tension. if its not in that area, then you need a new belt. the tensioner pulley keeps it tight

Jul 31, 2010 | 1999 Ford Mustang Cobra

3 Answers

1999 kia sportage timing marks


dfd3ea1.gif Crankshaft match marks


Align marks on timing belt pulley and pump body.

Camshaft pulley alignment marks
9f1c7ef.gif
  1. Align marks on camshaft pulleys with alignment marks on seal plate.
  2. Install timing belt. NOTE: No looseness should exist on the tension side and at the camshaft pulleys.
  3. Loosen tensioner lock bolt.
  4. Turn crankshaft 2 revolutions in direction of rotation and check that timing marks are still in alignment.
  5. Tighten timing belt tension lock bolt to 27-38 ft lb (32-52 Nm).
  6. Apply a force of 22 lbs to timing belt between camshaft sprockets.
  7. Belt deflection should measure 0.30-0.33 in (7.5-8.5 mm)
  8. NOTE: Replace tensioner spring if timing belt deflection is excessive.
Timing Belt Installation


eb770f2.gif
  1. Install lower timing belt cover.
  2. Install upper timing belt cover.
  3. Install power steering drive belt and adjust belt tension.
  4. Install fan pulley.
  5. Install generator drive belt and adjust belt tension.
  6. Install A/C drive belt and adjust belt tension.
  7. Install splash guard.
  8. Install fan and fan shroud.
  9. Install 4 fan bolts. Tighten to 24 ft lb (33 Nm).
  10. Install fan shroud mounting bolts.
  11. Install fresh air duct.
  12. Connect hose to resonance chamber.
  13. Connect battery negative cable.

Jul 26, 2009 | 1999 Kia Sportage

2 Answers

Cambelt change on uno turbo


By now you probably have the cam/timing belt changed on the vehicle... Here goes anyway: I changed the belt on my 1372cc (identical engine - except for the Turbo and a few odds & ends) just over a week ago by following this simple process:

Disconnect the battery negative terminal
Remove the timing belt cover
Loosen the alternator drive belt nut, tilt towards engine and remove the belt
Remove the crankshaft pulley nut (size 36) - do this by selecting top gear and have an assistant press hard on the brake pedal - remove the pulley -the timing belt is now exposed.
Using paint or tippex, simply mark the camshaft sprocket as it lies with the inside timing belt cover, do the same on the crankshaft sprocket & the auxiliary shaft sprocket.
Loosen the tensioner nut - remove the timing belt.
Check that all pulleys are still in alignment according to your markings and refit the new belt by starting on the crankshaft sprocket (the thin white line across the new belt must align with the factory marking on the crankshaft pulley) and over the auxiliary sprocket and finally over the camshaft sprocket - tension the belt with the tensioner and tighten the tensioner nut.
Rotate the engine clockwise by hand making sure the camshaft sprocket rotates twice, check the tension on the belt and make sure the tensioner nut is fully tightened and the belt is secure.
Refit the crankshaft pulley, making sure the nut is tightened and refit the alternator belt, timing cover and reconnect the battery.

The same procedure is applicable on the 999cc/1108cc FIRE models as well as the 1301cc Turbo.

Good luck.


Apr 14, 2009 | Fiat 124 Cars & Trucks

1 Answer

Change drive belt //


check this out 02bdcd0.jpg
loosen the the two bolts (show on the figure above) first
loosen also the bolt used for adjusting tension.
remove the old worn-out belt.
place the new belt (you may need to loosen further the tension adjusting bolt)
when belt is properly place, tighten it enough the tension adjusting bolt,
(not too tight, but not too loose) press the belt to ensure its not too loose!
When belt tightness is enough, tighten the the other lower one of the two bolt then the lastly tighten the pivot bolt.
gookluck!!!!



Oct 31, 2008 | 2002 Nissan Maxima

2 Answers

I have a 1992 saab 9000 with a 2.3l turbo engine with a loose belt. i don't see an easy way to tighten. do you have a solution? Thanks, Den


hi den the 2.3 has a hydulic tensioner that is non ajustable if the belt is lose this will need replaceing

Oct 11, 2008 | Saab 9000 Cars & Trucks

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