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The drive belt has an automatic tensioner pulley. It will be a pulley on it's own attached to an arm. It'll be the top left pulley under the drive belt if there are only 2 at the top, or it'll be on the top righton top of the drive belt if there are 3 or 4 pulleys across the top.
Check to make sure it is moving freely. You can do this by attaching a wrench to it and moving it down if it is under the belt, or up if it is ontop of the belt. It should require a bit of force. If it doesn't move or is easy to move then it needs to be replaced. If it feels like it's moving freely and the spring seems strong then your belt is stretched past it's limit and needs to be replaced.
Alternatively it may be screeching due to a pulley seizing up. Check to make sure things like the idler pulleys or the A/C and Alternator pulleys move freely.
You have to find the tension pully. using a 3/8 socket wrench. not the socke but the actual wrench. place the square end of the wrench into the notch on the pully and either push or pull (depends on the v-belt system) and it should move. place your v-belt around the pully's according to the diagram under your hood leaving your tension pully to be the last one the belt goes on. Move that tension pully as mentioned above and place it the belt on the pully. The diagram under the hood should also show you where that tension pully is located.
Really don't need a diagram. Loosen the slide bolts on the power steering pump. loosen or tighten the pump by turning the jack screw (long transverse bolt) under the pump. Once the belt is tightened up, lock down the slide bolts and you are finished.
If the tensioner can be moved by hand the lock down bolt is not doing its job. Try to tighten the bolt with the belt pulled tight and then release. If the belt loosens the bolt is not working as it should. Make sure theres a lock washer (split lock washer) between the bolt head and the post.
Disconnect battery earth lead. Do not turn crankshaft or camshaft whn timing beld removed. Remove spark plugs to ease turning engine. Turn engine in normal direction of rotation (unless otherwise stated) Do not turn engine via camshaft or other sprockets. Observe all tightening torques. Remove engine, remve RH engine mounting. Remove auxiliary drive belts, water pump pulley, crankshaft pulley, timing belt upper cover, timing belt lower cover. Turn crankshaft clockwise to TDC on No. 1 cylinder, slacken tensioner bolts 5 & 6. Move tensioner away from belt and lightly tighten bolts. Remove timing belt. Remove water pump and replace with new one. Suggest to replace cambelt as well.
Ensure timing marks aligned3 & 4. Fit timing belt in anti-clockwise direction, standing at crankshaft sprocket. Ensure belt is taut between sprockets on non-tensioned side. Slacken tensioner bolt 5. slacken tensioner bolt 6. Allow tensioner to operate. Tighten tensioner bolt 6. Tighten tensioner bolt 5. Turn crankshaft on turn clockwise. Ensure crankshaft sprocket timing marks aligned 4.
Slacken tensioner bolt 5. Slacken tensioner bolt 6. Allow tensioner to operate. Tighten tensioner 6. Tighten torque: 20 - 26 Nm. Tighten tensioner bolt 5. tighten torque: 20 - 26 Nm. Apply thumb pressure to belt at middle. Approximately 5kg. Belt should deflect to 1/4 of tensioner bolt head width 7. Belt tention can also be set using burroghs (BT-33-73F) tension gauge 10 at middle. Turn crankshaft 90 ° anti clockwise. Check belt tension is 9.5 16,5kg (engine must be cold). Install components in reverse order of removal. Fit cranckshaft pully. Tighten crankshaft pully bolts 8. G4-J: Tightening torque: 12-15Nm.
G4-N/G4-k: Tightening torque: 10-12Nm
G4EA: Tighten crankshaft pully bolt 9. Tighten torque: 140-150Nm.
If you look at the tensioner pulley, there is a stud on which the pulley rides, and then a large washer and a nut (which holds it on). The nut must be loosened just a bit (not so loose as to allow alot of play in the mounting) but just loose enough to allow movement - then you can turn the adjustment bolt Clockwise(CW) tighten - or Counter-CW to loosen - but leave it just a bit shy of tight, then as you tighten the nut, the pulley will straighten and tighten a bit more. I hope this is what you are referring to. Hope it helps! DD