Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Belts

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INSPECTION



See Figures 1, 2, 3, 4 and 5



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Fig. Fig. 1: There are typically 3 types of accessory drive belts found on vehicles today



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Fig. Fig. 2: An example of a healthy drive belt



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Fig. Fig. 3: Deep cracks in this belt will cause flex, building up heat that will eventually lead to belt failure



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Fig. Fig. 4: The cover of this belt is worn, exposing the critical reinforcing cords to excessive wear



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Fig. Fig. 5: Installing too wide a belt can result in serious belt wear and/or breakage

Check the drive belts for glazing, cracks, fraying, wear and tension every 6,000 miles (9,662 km). 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 best to replace all drive belts at one time, as a preventive maintenance measure, during this service operation. It is recommended that the belts be replaced every 24 months or 24,000 miles (38,647 km). Belt deflection at the midpoint of the longest span between pulleys should not be more than 7 / 16 in. (11mm) with 22 lbs. (10 kg) of pressure applied to the belt when engine is cold.

ADJUSTMENT



An overly tight belt will wear out the pulley bearings on the assorted components.

To adjust the tension on all components except the air conditioning compressor and power steering pump, loosen the pivot and mounting bolts of the component which the belt is driving, then, using a wooden lever or equivalent, pry the component toward or away from the engine until the proper tension is achieved. Tighten the component mounting bolts securely. If a new belt is installed, recheck the tension after driving about 1,000 miles (1,610 km).

Belt tension adjustments for the factory installed air conditioning compressor are made at the idler pulley. The idler pulley is the smallest of the 3 pulleys. At the top of the slotted bracket holding the idler pulley is a bolt which is used to either raise or lower the pulley. To free the bolt for adjustment, it is necessary to loosen the locknut in the face of the idler pulley. After adjusting the belt tension, tighten the locknut in the face of the idler pulley.

Belt tension adjustments for the power steering pump are made at the pump. Loosen the power steering pump's adjusting lockbolt and its mounting bolt. Turn the adjusting bolt until the belt deflection is correct. Tighten the adjusting bolt's lockbolt and the mounting bolt securely.

REMOVAL & INSTALLATION



See Figures 6, 7, 8, 9, 10, 11, 12 and 13



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Fig. Fig. 6: Drive belt routing-Pulsar engines



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Fig. Fig. 7: Drive belt routing-Sentra E15 and E16 engines



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Fig. Fig. 8: Drive belt routing-diesel engine



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Fig. Fig. 9: Drive belt routing-CA16DE and CA18DE engines



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Fig. Fig. 10: Drive belt routing-GA16DE engine



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Fig. Fig. 11: Drive belt routing-SR20DE engine



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Fig. Fig. 12: If so equipped, use a wrench to loosen the idler pulley locknut ...



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Fig. Fig. 13: ... then turn the idler pulley's adjusting bolt to alter belt tension

To replace a drive belt, loosen the pivot and mounting bolts of the component which the belt is driving, then, using a wooden lever or equivalent, pry the component inward to relieve the tension on the drive belt, always be careful where you locate the pry bar not to damage the component. Slip the belt off the component pulley, match up the new belt with the old belt for length and width, these measurement must be the same or problems will occur when you go to adjust the new belt. After new belt is installed correctly adjust the tension of the new belt.

When replacing more than one belt, it is a good idea to make note or mark what belt goes around what pulley. This will make installation fast and easy.

On air conditioning compressor and power steering pump belt replacements, loosen the lockbolt for the adjusting bolt on the idler pulley or power steering pump, then loosen the adjusting bolt. Pry the pulley or pump inward to relieve the tension on the drive belt, but always be careful where you locate the prybar so as not to damage the component or pulley.

 
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