Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Timing Belt

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REMOVAL & INSTALLATION



Refer to General Information & Maintenance for the manufacturer's recommendations on timing belt replacement schedules. Broken timing belts may cause severe engine damage. It is more cost effective to replace the belt based on maintenance schedule or inspection, rather than wait until it fails. If the belt breaks while the engine is running it may cause additional piston or valve damage.

E-Series Overhead Camshaft Engines

See Figure 1



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Fig. Fig. 1: Valve timing alignment marks-E-Series engines

  1. Refer to the Timing Belt Cover removal and installation procedures in this section, and remove the timing cover.
  2.  
  3. If necessary, remove the spark plug, then turn the crankshaft to position the No. 1 piston at TDC of the compression stroke.
  4.  

Note the position of the timing marks on the camshaft sprocket, the timing belt and the crankshaft sprocket (see illustrations).

  1. Loosen and/or remove the timing belt tensioner. Mark the rotation direction of the timing belt, then remove it from the sprockets.
  2.  
  3. To remove the front oil seal, pull off the crankshaft sprocket, then pry out the oil seal with a small prybar (be careful not to scratch the crankshaft).
  4.  

To install:
  1. Clean the oil seal mounting surface.
  2.  
  3. Install a new oil seal, the timing belt and tensioner. Torque the tensioner pulley bolts to 13-16 ft. lbs. (17-22 Nm), the timing cover bolts to 30-48 inch lbs. (3.4-5.4 Nm), the crankshaft pulley bolt to 83-108 ft. lbs. (113-147 Nm).
  4.  
  5. Install the timing belt covers.
  6.  
  7. Start engine and check timing.
  8.  

CA16DE and CA18DE Engines

See Figures 2, 3, 4, 5, and 6



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Fig. Fig. 2: Valve timing alignment marks-CA16DE and CA18DE engines



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Fig. Fig. 3: Loosen the tensioner pulley nut-CA16DE and CA18DE engines



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Fig. Fig. 4: Camshaft timing pulley alignment marks-CA16DE and CA18DE engines



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Fig. Fig. 5: Camshaft sprocket plate installation-CA16DE and CA18DE engines



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Fig. Fig. 6: A spacer must be installed between the crankshaft and pulley bolt head before rotating the engine-CA16DE and CA18DE engines

  1. Disconnect the negative (-) battery cable.
  2.  
  3. Drain the cooling system.
  4.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Disconnect the upper radiator hose at the elbow and then position it out of the way.
  2.  
  3. Remove the right side engine under cover.
  4.  
  5. Loosen the power steering pump and the air conditioning compressor and then remove the drive belts.
  6.  
  7. Remove the water pump pulley.
  8.  
  9. Matchmark the crank angle sensor to the upper front cover and the remove it. Carefully position it out of the way.
  10.  
  11. Position a floor jack under the engine and raise it just enough to support the engine.
  12.  
  13. Remove the upper engine mount bracket at the right side of the upper front cover.
  14.  
  15. Remove the upper front cover.
  16.  
  17. Align the timing marks on the camshaft pulley sprockets and then remove the crankshaft pulley.
  18.  

The crankshaft pulley may be reached by removing the side cover from inside the right-hand wheel opening.

  1. Remove the lower front cover.
  2.  
  3. Loosen the tensioner pulley nut to slacken the timing belt and then slide off the belt.
  4.  

To install:

Do not bend or twist the timing belt. NEVER rotate the crankshaft and camshaft separately with the timing belt removed. Be sure the timing belt is free of any oil, water or debris.

  1. Install the crankshaft sprocket with the sprocket plates.
  2.  
  3. Before installing the timing belt, ensure that the No. 1 piston is at TDC of the compression stroke (all sprocket timing marks will be in alignment with the marks on the case).
  4.  

When the timing belt is on and in position, there should be 39 cogs between the timing mark on each of the camshaft sprocket and 48 cogs between the mark on the right camshaft sprocket and the mark on the crankshaft sprocket.

  1. Loosen the timing belt tensioner pulley nut.
  2.  
  3. Temporarily install the crankshaft pulley bolt and then rotate the engine two complete revolutions.
  4.  

Fabricate and install a suitable 25mm thick spacer between the end of the crankshaft and the head of the crankshaft pulley bolt to prevent bolt damage.

  1. Tighten the tensioner pulley bolt to 16-22 ft. lbs. (21-30 Nm).
  2.  
  3. Install the upper and lower front covers.
  4.  
  5. Install the crankshaft pulley with its washer and tighten it to 105-112 ft. lbs. (143-152 Nm).
  6.  
  7. Install the engine mount bracket.
  8.  
  9. Install the water pump pulley. Install the crank angle sensor so that the matchmarks made previously line up and tighten the bolts to 61-70 inch lbs. (7-9 Nm).
  10.  
  11. Install all drive belts and adjust.
  12.  
  13. Install the right side engine under cover.
  14.  
  15. Reconnect the radiator hose and refill the radiator.
  16.  
  17. Connect the battery cable and start the engine. Check engine timing and for any leaks. Road test.
  18.  

CD17 (Diesel) Engine

See Figures 7 and 8



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Fig. Fig. 7: Timing belt alignment marks-CD17 diesel engine



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Fig. Fig. 8: Aligning the timing marks for the injection pump-CD17 diesel engine

VALVE TIMING BELT
  1. Disconnect the negative (-) battery cable.
  2.  
  3. Set the No. 1 cylinder on TDC of the compression stroke. The crankshaft pulley marks should align with the front cover pointer.
  4.  
  5. Remove all accessory drive belts.
  6.  
  7. Remove the crankshaft damper and pulleys.
  8.  
  9. Remove the timing belt cover.
  10.  
  11. Loosen the belt tensioner and set in the free position.
  12.  
  13. Remove the crankshaft pulley with the timing belt.
  14.  

To install:
  1. Confirm that No. 1 cylinder is on TDC of the compression stroke.
  2.  

Put a mark on the timing belt at the 39th cog, if the alignment marks on the belt are worn away.

  1. Align each mark and install the timing belt.
  2.  
  3. Install the crank pulley plate with the bezel facing the engine.
  4.  
  5. Loosen the tensioner bolt and turn crankshaft 2 times in the clockwise direction.
  6.  
  7. Turn the tensioner while holding it. If the tensioner turns while tightening, it may cause timing belt to be overloaded.
  8.  
  9. Torque the tensioner bolt to 90 ft. lbs. (123 Nm).
  10.  
  11. Install the front timing cover and crankshaft damper pulley. Torque the pulley bolt to 90-98 ft. lbs. (123-132 Nm).
  12.  
  13. Install the remaining components and start engine.
  14.  

INJECTION TIMING BELT
  1. Disconnect the negative (-) battery cable.
  2.  
  3. Set the No. 1 cylinder on TDC of the compression stroke. The crankshaft pulley marks should align with the front cover pointer.
  4.  
  5. Remove the timing belt cover.
  6.  
  7. Loosen the belt tensioner and set to the free position.
  8.  
  9. Remove the belt from the pulleys.
  10.  

To install:
  1. Confirm that No. 1 cylinder is at TDC of the compression stroke.
  2.  

Put a mark on the timing belt at the 23rd cog, if the alignment marks on the belt are worn away.

  1. Align each mark and install the timing belt.
  2.  
  3. Loosen the tensioner bolt and turn crankshaft 2 times in the normal direction.
  4.  
  5. Turn the tensioner while holding it. If the tensioner turns while tightening, it may cause timing belt to be overloaded.
  6.  
  7. Torque the tensioner bolt to 15 ft. lbs. (21 Nm).
  8.  
  9. Install the timing cover.
  10.  
  11. Install the remaining components and start the engine.
  12.  

 
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