Question about 1992 BMW 3 Series
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Posted on Jan 02, 2017
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Apr 14, 2014 | 1991 Nissan Sentra 2 Door
Belt tension is very important, as a belt that is too tight will put too much stress on the bearings of the components it drives, causing them to wear out prematurely. A belt that is too loose will slip, causing (1) the belt to wear out quickly due to friction heat, and (2) inefficient alternator, air pump, cooling fan or air conditioner operation because much of the turning power supplied by the main drive pulley is lost.
The belts should be inspected and/or adjusted at 2,000 miles (3,221 km) and then every 4,000 miles (6,441 km). First, make sure that the belt is properly positioned in the pulley. Check the pulleys for damage. Inspect the belts for cracks and signs of fraying. These usually develop on the inner surface and extend into the backing or outer surface of the belt. Check also for glazing, a completely smooth appearance which indicates slippage. A belt that is in good shape will have a slightly grainy appearance like cloth. Replace belts that show cracks or glazing.
Check belt tension. Apply pressure with your thumb at the mid-point between two pulleys, and the belt should stretch or deflect about 1 / 4 - 1 / 2 in. (6-13mm). If the belt is too tight or too loose, adjust/replace as necessary.
See Figures 1, 2 and 3
To adjust belts, first locate the mounting bolt on the air pump or alternator (each has its own belt and adjusts to permit that belt to be tensioned correctly). This bolt attaches the unit to the engine and has a nut on the end. Put a wrench on either end and loosen the bolt until there is practically no tension on it. Then, loosen the adjusting bolt, which is located on the opposite side of the unit and which passes through a slot. Pull the alternator or air pump away from the engine and tighten the adjusting bolt just enough to hold the unit while you check tension. Repeat the adjustment procedure until the belt deflects the proper amount, then fully tighten the adjusting and mounting bolts. Avoid too much belt tension or overtightening of bolts. A new belt should be tensioned just slightly more (about 0.4 in. or 10mm deflection) and checked after several hundred miles of operation to make sure that tension is still adequate. (Tension is lost very rapidly until a new belt is broken in.)
Fig. Fig. 3: On some GLC engines equipped with power steering, the pump pulley uses a slotted adjusting bar, adjusting bolt and locknut to adjust belt tension
Late model GLCs, 323s, 626s, MX-6s and 929s may use an adjusting bolt on either the idler pulley (a pulley which is not directly associated with any of the accessories) or on the power steering pump itself. This bolt makes adjustment much easier because you don't have to hold the accessory under a great deal of tension while tightening the mounting bolts.
On models where the idler pulley has a locknut at its center, simply loosen the locknut, then turn the adjusting bolt clockwise to increase belt tension or counterclockwise to decrease it or remove the belt. Do not forget to retighten the locknut when tension is correct, or vibration may cause it to fall off. Recheck the tension with the locknut tightened and readjust if necessary.
To adjust the power steering pump pulley on the GLC, loosen the slotted adjusting bar bolt, the mounting bolt across from it, and the locknut at the bottom of the adjusting bolt. Turn the adjusting bolt counterclockwise to remove the belt or reduce tension, and clockwise to increase it. When tension is correct, tighten the adjusting bolt locknut, adjusting bar bolt, and pump mounting bolt.
On 626, MX-6 and 929 models with a 4-ridge or 5-ridge ribbed type V-belt driving both the air conditioner and power steering pump, belt tension is much greater. With a used belt, deflection should only be about 1 / 4 in. (6.35mm).
See Figures 4, 5 and 6
The RX-7 may be equipped with as many as three or four separate drive belts. The belts are arranged at the front of the engine and drive the cooling fan/water pump, alternator, power steering pump, emission control air pump and air conditioner compressor (if so equipped).
Fig. Fig. 4: Checking belt tension on 1979-85 RX-7
Check the tension of each belt at the arrows numbered 1, 2, 3 and 4 (depending on year) shown in the illustration. Press on the belt with your thumb using moderate pressure (about 22 lbs.). The belts should give or deflect the amounts shown in the chart.
Fig. Fig. 6: RX-7 belt deflection limits
Use the following appropriate procedure and illustration to make drive belt adjustment(s).
ALTERNATOR AND AIR PUMP
See Figure 7
Fig. Fig. 7: Adjusting alternator drive belt tension on 1986-89 RX-7
When prying on the alternator or air pump, make sure the prybar is anchored against the engine case and not against a component (distributor cap, etc.) which could break.
Fig. Fig. 8: Adjusting air conditioning compressor drive belt tension on 1986-89 RX-7
Fig. Fig. 9: Adjusting power steering pump drive belt tension on 1986-89 RX-7
REMOVAL & INSTALLATION
May 27, 2012 | 1989 Mazda 323
Route the belt over the pulleys.
Fig. Removing the A/C and P/S pump belt-1.8L engine
Fig. Alternator belt-1.8L engine
Mar 30, 2011 | 2001 Kia Spectra
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Alternator BELT REMOVAL 1. REMOVE BATTERY AND BATTERY TRAY 2. DISCONNECT POWER STEERING (PS) RESERVOIR TANK 3. REMOVE DRIVE BELTS a. Loosen the lock bolt, pivot bolt and adjusting bolt. b. Remove the 2 drive belts. GENERATOR BELT INSTALLATION 1. INSTALL DRIVE BELTS a. Install the drive belts. b. Adjust the drive bell with the adjusting bolt. c. Tighten the pivot and adjusting lock bolts. Torque: Pivot bolt: 59 N.m (600 kgf.cm, 43 ft.lbs Lock bolt: 21 N.m (210 kgf.cm, 15 ft.lbs 2. CONNECT POWER STEERING (PS) RESERVOIR TANK 3. INSTALL BATTERY TRAY AND BATTERY
Alternator BELT REMOVAL
1. REMOVE BATTERY AND BATTERY TRAY
2. DISCONNECT POWER STEERING (PS) RESERVOIR TANK
3. REMOVE DRIVE BELTS
a. Loosen the lock bolt, pivot bolt and adjusting bolt.
b. Remove the 2 drive belts.
GENERATOR BELT INSTALLATION
1. INSTALL DRIVE BELTS
a. Install the drive belts.
b. Adjust the drive bell with the adjusting bolt.
c. Tighten the pivot and adjusting lock bolts.
Pivot bolt: 59 N.m (600 kgf.cm, 43 ft.lbs
Lock bolt: 21 N.m (210 kgf.cm, 15 ft.lbs
2. CONNECT POWER STEERING (PS) RESERVOIR TANK
3. INSTALL BATTERY TRAY AND BATTERY
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Regards, Lee Davidian
Dec 23, 2010 | 1997 Toyota Land Cruiser
Nov 12, 2010 | 1988 Mercury Grand Marquis
Remove the alternator/power steering and water pump drive belt to gain access to the air conditioning belt.
Loosen the tensioner pulley locknut, then turn the adjusting screw to raise or lower the tensioner pulley assembly. Remove the belt.
Install the belt.
To adjust the belt, loosen the tensioner pulley nut and adjust the belt tension by tightening the adjusting screw. Tighten the pulley nut to 40 ft. lbs. (54 Nm) after adjustment.
Install the alternator/power steering and water pump drive belt and adjust.
Start the engine and check for proper belt alignment and any abnormal noise.
Nov 01, 2010 | 1995 Dodge Intrepid
Oct 17, 2010 | 1997 Jeep Grand Cherokee
Dec 03, 2009 | 1992 Honda Accord
Nov 02, 2009 | 1998 Chevrolet Malibu
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