Question about 2007 Nissan Altima 3.5 Sedan

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New serpentine belt is squalling.

Is there a torque specification? Or, should I just tighten until it stops screeming?

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  • paul_ingblue May 11, 2009

    I've worked on cars that have a tension pulley that is spring loading therefore self adjusting but this one has an adjuster bolt and then you tighten it into position. Different. I adjusted the belt to match the other belt on the car but it is either too loose or too tight or just a bad quality belt. Thanks for your answer though.

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There is a self adjuster for a serpentine belt. the sqaulling you hear is most likely either you have a bearing failing on the idler pulley or the adjuster no longer is keeping tension on the belt . i would check those items closely and replace them if need be

Posted on May 09, 2009

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leedavidian_154.jpg

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0996b43f80209583.jpg

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0996b43f80209554.jpg

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ADJUSTING V-Belts Fig. 1: A gauge is recommended, but the belt deflection may be checked using light thumb pressure 85341063.gif
Fig. 2: Loosening alternator pivot/adjustment bolt in order to tighten the belt 85341094.jpg Fig. 3: Apply tension to the belt being careful not to damage the case. While holding accessory in this position, tighten the pivot bolt. 85341095.jpg Fig. 4: Using a 1?2 in. ratchet, apply tension to the air conditioning belt while tightening the pivot bolt 85341096.jpg Belts are normally adjusted by loosening the bolts of the accessory being driven and moving that accessory on its pivot points until the proper tension is applied to the belt. The accessory is held in this position while the bolts are tightened. To determine proper belt tension, you can purchase a belt tension gauge or simply use the deflection method. To determine deflection, press inward on the belt at the mid-point of its longest straight run. The belt should deflect (move inward) 3?8 - 1?2 in. (10-13mm). A general rule for alternator belt tension is that the pulley should not be capable of being turned with hand pressure. Serpentine Belt On most newer vehicles, a single belt is used to drive all of the engine accessories formerly driven by multiple V-belts. The single belt is referred to as a serpentine belt. All the belt driven accessories are rigidly mounted with belt tension maintained by a spring loaded tensioner. Because of the belt tensioner, no adjustment is necessary. REMOVAL & INSTALLATION V-Belt Fig. 1: Loosen the component mounting and adjusting bolts slightly 85341064.gif
Fig. 2: Remove the belt by pushing the component toward the engine 85341065.gif
Fig. 3: Remove the drive belt 85341066.gif
Fig. 4: To tighten the belt, pull the component away from the engine and tighten the mounting bolts to specifications 85341067.gif
To remove a V-style drive belt, simply loosen the accessory being driven and move it on its pivot point to free the belt. Then, remove the belt. It is important to note that on engines with many driven accessories, several or all of the belts may have to be removed to get at the one to be replaced. Serpentine Belt Fig. 5: Serpentine belt tensioner - V6 engine 85341068.gif
Fig. 6: Serpentine belt tensioner - V8 engine 85341069.gif
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1989–92 VEHICLES
  1. Disconnect the negative battery cable.
  2. Remove the serpentine belt and timing belt cover.
  3. Loosen the water pump bolts and release tension with tool J–33039 or equivalent.
  4. Raise and support the vehicle safely.
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  1. Disconnect the negative battery cable, then partially drain and recover the cooling system.
  2. Remove the coolant recovery reservoir.
  3. If equipped, remove the A/C belt.
  4. Remove the serpentine belt.
  5. Disconnect the evaporative emission pipe assembly.
  6. Remove the crankshaft pulley assembly.
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  8. Align the marks on the crankshaft sprocket with the marks on the rear timing belt cover by rotating the crankshaft.
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  10. Carefully lower the vehicle, then remove the timing belt. Fig. 12: Timing belt installation and tightening specifications — 1993–94 2.0L OHC engines 87953119.gif
    To install:
  11. Turn the crankshaft and camshaft gears clockwise to align the timing marks on the gears with the timing marks on the rear cover.
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  13. Using tool J 33039-A, or equivalent adjustment tool, turn the coolant pump eccentric clockwise until the tensioner arm contacts the high torque stop. Tighten the water pump screws slightly.
  14. Turn the engine by the crankshaft gear bolt 720°clockwise to fully seat the belt into the gear teeth.
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  21. Install the coolant recovery reservoir.
  22. Properly fill the cooling system, then connect the negative battery cable.
prev.gif next.gif

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