Here's a pic
Tensioning is done automatically by the tensioner pulley
Generally a bar (crowbar/pipe/etc) is used to put pressure on the tensioner pulley. That loosens the belt and allows you to finish "routing" the belt on the rest of the equipment.
But I am not sure what you have, Isuzu just as all manufacturers have differences even amongst the same models ..
So I am going with this solution ...
I would suggest that you take the belt off and get the tensioner mechanism attached properly then reinstall the belt ..
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ADJUSTMENT
Excessive belt tension will cause damage to the alternator and water pump pulley bearings, while, on the other hand, loose belt tension will produce slip and premature wear on the belt. Therefore, be sure to adjust the belt tension to the proper level.
To adjust the tension on a drive belt, loosen the adjusting bolt or fixing bolt locknut on the alternator, alternator bracket or tension pulley. Then move the alternator or turn the adjusting bolt to adjust belt tension. Once the desired value is reached, secure the bolt or locknut and recheck tension.
REMOVAL & INSTALLATION
1.5L, 1.6L, 1.8L, 2.0L and 2.4L Engines
Fig. Accessory V-belt routing-Mitsubishi 1.5L, 1.6L, 1.8L, 2.0L and 2.4L engines
Alternator Belt
Fig. Loosen the adjuster lock bolt . . .
Fig. . . . then remove the alternator belt from the engine
Fig. After the adjusting and fixed bolts are loosened, rotate the pump . . .
Fig. . . . then remove the power steering belt from the engine
Fig. Serpentine belt routing-Mitsubishi 3.0L engines (except 1998-00 Galant models)
Fig. Accessory V-belt routing-Mitsubishi 3.5L and 1998-00 3.0L SOHC Galant engines
ALTERNATOR AND A/C COMPRESSOR
INSPECTION
All Models
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.
ADJUSTING
Except RX-7
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. 1: Some engines utilize an idler pulley with a locknut at its center
Fig. Fig. 2: After loosening the idler adjuster locknut, turn the adjusting bolt clockwise to increase belt tension or counterclockwise to decrease it
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).
RX-7
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. 5: Checking belt tension on 1986-89 RX-7
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
All Models
Fig. Fig. 6: Loosen the pivot bolt ...
Fig. Fig. 7: ... push the component inwards ...
Fig. Fig. 8: ... slip the old belt off and install a new one
Fig. Fig. 9: Pull outwards to tension the belt
Fig. Fig. 10: Belt routing on the 20R, 22R and 22R-EC engines
Fig. Fig. 11: Belt routing on the 4ME, 5ME and 5MG-E engines
Alternator
To adjust the tension of the alternator
drive belt on all models, loosen the pivot and mounting bolts on the
alternator. Using a wooden hammer handle, a broomstick or your hand,
move the alternator one way or the other until the proper tension is
achieved.
WARNING
Do not use a screwdriver or any other metal device (such as a prybar) as a lever.
Tighten the mounting bolts securely. If a new belt has been
installed, recheck the tension after about 200 miles (480 km) of
driving.
Air Conditioning Compressor
A/C compressor belt
tension can be adjusted by turning the tension adjusting bolt which is
located on the compressor tensioner bracket. Turn the bolt clockwise to
tighten the belt and counterclockwise to loosen it.
Air Pump
See Figures 12
To
adjust the tension of the air pump drive belt, loosen the adjusting
lever bolt and the pivot bolt. Move the pump in or out until the desired
tension is felt.
The tension should be checked between the air pump and the crankshaft
pulley on cars without air conditioning. On cars with A/C, the tension
should be checked between the A/C compressor and the crankshaft pulley.
Fig. Fig. 12: Moving the air pump to tension the drive belt
Power Steering Pump
Tension on the power steering
belt is adjusted by means of an idler pulley. Turn the adjusting bolt on
the idler pulley until the desired tension is felt and then retighten
the lockbolt.
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That solution helped, but 2 things, 1st I can get the tension bolt back in, I loosen to get the belt on, 2nd, the Idle pully hardward the washers are hard to find. any suggestion?
Thanks, also 1 more question, when putting to belt on, I loosend the retention arm bolt that holds the arm to the engine block has a allen head and took it out got the belt on find but could not get the bolt to screw back in. Any suggestions?
i cant get the tension arm to shift down to allow me to complete the belt routing
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