Nissan Car Altima & Sentra 1999-06

## 1.6L & 2.4L Engines

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2.
3. If an adjustment is necessary, adjust the valve clearance while engine is cold by removing the adjusting shim. The adjusting shim can be removed by using the following procedures:
1. Turn the crankshaft so the camshaft lobe of the valve to be adjusted is pointed straight up.
2.
3. Turn the lifter so the notch is pointed towards the center of the cylinder head; this will facilitate the shim removal process.
4.
5. Using a depressor tool, push down on the lifter and insert a keeper tool on the edge of the lifter to keep the lifter in the depressed position.
6.
7. Remove the depressor tool and remove the shim with a magnet.
8.

4.
5. Determine the replacement adjusting shim size by using the following procedures and formula:
1. Using a micrometer determine thickness of the removed shim.
2.
3. Calculate the thickness of a new adjusting shim so valve clearance is within the specified values.
4.
5. R = thickness of the removed shim.
6.
7. N = thickness of the new shim.
8.
9. M = measured valve clearance.

1.6L engine: Intake shim determination formula: N = R + (M - 0.0146 in. or 0.37mm)

1.6L engine: Exhaust shim determination formula: N = R + (M - 0.0157 in. or 0.40mm)

2.4L engine (240SX models): Intake shim determination formula: N = R + (M - 0.0146 in. or 0.37mm)

2.4L engine (240SX models): Exhaust shim determination formula: N = R + (M - 0.0146 in. or 0.37mm)

2.4L engine (Altima models): Intake shim determination formula: N = R + (M - 0.0138 in. or 0.35mm)

2.4L engine (Altima models): Exhaust shim determination formula: N = R + (M - 0.0146 in. or 0.37mm)

10.

6.

Shims are available in different sizes from 0.0772-0.1055 in. (1.96-2.68mm) in increments of 0.0008 in. (0.02mm). The thickness is stamped on the shim; this side is always installed facing down. Select new shims with thickness as close as possible to calculated valve and install it in the lifter.

1. Install the new shim onto the lifter.
2.
3. Depress the lifter and remove the keeper tool. Remove the depressor tool and recheck the valve clearance. Repeat this procedure for any other valves requiring adjustment.
4.
5. Install the cylinder head cover and spark plugs when all valve adjustments are finished.
6.

Checking Valve Lash
1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2.
3. Run the engine until it reaches normal operating temperature and shut if off.
4.
5. Remove the cylinder head cover and all the spark plugs.
6.
7. Set the No. 1 cylinder at Top Dead center (TDC) on its compression stroke. Align the pointer with the TDC mark on the crankshaft pulley. Check that the valve lifters on the No. 1 cylinder are loose and valve lifters on the No. 4 cylinder are tight. If not, turn the crankshaft 1 revolution (360 degrees) and align the pointer with the TDC mark on the crankshaft pulley.
8.
9. Check the following valves:

Both No. 1 intake valves

Both No. 1 exhaust valves

Both No. 2 intake valves

Both No. 3 exhaust valves

10.
11. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements which are out of specification.

Fig. Measure the clearance of the valves indicated when the No. 1 piston is at TDC on compression-1.6L and 2.4L engines

12.
13. Turn the crankshaft 1 revolution (360 degrees) and align the mark on the crankshaft pulley with the pointer. Check the following valves:

Both No. 2 exhaust valves

Both No. 3 intake valves

Both No. 4 intake valves

Both No. 4 exhaust valves

14.
15. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements which are out of specification.

Fig. Measure the clearance of the valves indicated when the No. 4 piston is at TDC on compression-1.6L and 2.4L engines

16.
17. If all the valve clearances are within specification, install the cylinder head cover and the spark plugs.
18.

## 1.8L, 2.4L & 2.5L Engines

1. Before servicing the vehicle, refer to the Precautions section.
2.
3. If an adjustment is necessary, adjust the valve clearance while engine is cold by removing the adjusting shim. The adjusting shim can be removed by using the following procedures:
1. Turn the crankshaft so the camshaft lobe of the valve to be adjusted is pointed straight up.
2.
3. Turn the lifter so the notch is pointed towards the center of the cylinder head; this will facilitate the shim removal process.
4.
5. Using a depressor tool, push down on the lifter and insert a keeper tool on the edge of the lifter to keep the lifter in the depressed position.
6.
7. Remove the depressor tool and remove the shim with a magnet.
8.

4.
5. Determine the replacement adjusting shim size by using the following procedures and formula:
1. Using a micrometer determine thickness of the removed shim.
2.
3. Calculate the thickness of a new adjusting shim so valve clearance is within the specified values.
4.
5. R = thickness of the removed shim.
6.
7. N = thickness of the new shim.
8.
9. M = measured valve clearance.
10.
11. 1.8L engine: Intake shim determination formula: N = R + (M - 0.0146 in. or 0.37mm)
12.
13. 1.8L engine: Exhaust shim determination formula: N = R + (M - 0.0157 in. or 0.40mm)
14.
15. 2.4L engine: Intake shim determination formula: N = R + (M - 0.0138 in. or 0.35mm)
16.
17. 2.4L engine: Exhaust shim determination formula: N = R + (M - 0.0146 in. or 0.37mm)
18.

6.

Shims are available in different sizes from 0.0772-0.1055 in. (1.96-2.68mm) in increments of 0.0008 in. (0.02mm). The thickness is stamped on the shim; this side is always installed facing down. Select new shims with thickness as close as possible to calculated valve and install it in the lifter.

1. Install the new shim onto the lifter.
2.
3. Depress the lifter and remove the keeper tool. Remove the depressor tool and recheck the valve clearance. Repeat this procedure for any other valves requiring adjustment.
4.
5. Install the cylinder head cover and spark plugs when all valve adjustments are finished.
6.

Checking Valve Lash
1. Before servicing the vehicle, refer to the Precautions section.
2.
3. Run the engine until it reaches normal operating temperature and shut if off.
4.
5. Remove the cylinder head cover and all the spark plugs.
6.
7. Set the No. 1 cylinder at Top Dead Center (TDC) on its compression stroke. Align the pointer with the TDC mark on the crankshaft pulley. Check that the valve lifters on the No. 1 cylinder are loose and valve lifters on the No. 4 cylinder are tight. If not, turn the crankshaft 1 revolution (360 degrees) and align the pointer with the TDC mark on the crankshaft pulley.
8.
9. Check the following valves:

Both No. 1 intake valves

Both No. 1 exhaust valves

Both No. 2 intake valves

Both No. 3 exhaust valves

10.
11. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements which are out of specification.
12.
13. Turn the crankshaft 1 revolution (360 degrees) and align the mark on the crankshaft pulley with the pointer. Check the following valves:

Both No. 2 exhaust valves

Both No. 3 intake valves

Both No. 4 intake valves

Both No. 4 exhaust valves

14.
15. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements which are out of specification.
16.
17. If all the valve clearances are within specification, install the cylinder head cover and the spark plugs.
18.

Fig. Measure the clearance of the valves indicated when the No. 1 piston is at TDC on compression-1.8L and 2.4L engines

Fig. Measure the clearance of the valves indicated when the No. 4 piston is at TDC on compression-1.8L and 2.4L engines

## 2.0L Engine

The engine is equipped with hydraulic lash adjusters. The valve lash is not adjustable.

## 3.0L & 3.5L Engines

NOTE
Check and adjust the valve clearances while the engine is cold and not running.

1. Before servicing the vehicle, refer to the Precautions section.
2.
3. If an adjustment is necessary, adjust the valve clearance while engine is cold by removing the adjusting shim. The adjusting shim can be removed by using the following procedures:
1. Turn the crankshaft so the camshaft lobe of the valve to be adjusted is pointed straight up.
2.
3. Turn the lifter so the notch is pointed towards the center of the cylinder head; this will facilitate the shim removal process.
4.
5. Using a depressor tool, push down on the lifter and insert a keeper tool on the edge of the lifter to keep the lifter in the depressed position.
6.
7. Remove the depressor tool and remove the shim with a magnet.
8.

4.

NOTE
Compressed air can be blown into the hole of the lifter to separate the adjusting shim from the lifter.

1. Determine the replacement adjusting shim size by using the following procedures and formula:
1. Using a micrometer determine thickness of the removed shim.
2.
3. Calculate the thickness of a new adjusting shim so valve clearance is within the specified values.
4.
5. R = thickness of the removed shim.
6.
7. N = thickness of the new shim.
8.
9. M = measured valve clearance.
10.

Intake shim determination formula: N = R + (M - 0.0118 in. or 0.30mm)

Exhaust shim determination formula: N = R + (M - 0.0130 in. or 0.33mm)

2.
3. Shims are available in 64 sizes from 0.0913-0.1161 in. (2.32-2.95mm) in steps of 0.004 in. (0.01mm). The thickness is stamped on the shim; this side is always installed facing down. Select new shims with thickness as close as possible to calculated valve and install it in the lifter.
4.
5. Install the new shim onto the lifter.
6.
7. Depress the lifter and remove the keeper tool. Remove the depressor tool and recheck the valve clearance. Repeat this procedure for any other valves requiring adjustment.
8.
9. When all valve adjustments are finished, install the cylinder head cover, spark plugs and the intake manifold collector.
10.

Checking Valve Lash
1. Before servicing the vehicle, refer to the Precautions section.
2.
3. Remove or disconnect the following:

Intake manifold collector

Left and right rocker covers

Spark plugs

4.
5. Set the No. 1 cylinder at Top Dead Center (TDC) on its compression stroke. Align the pointer with the TDC mark on the crankshaft pulley. Check that the valve lifters on the No. 1 cylinder are loose and valve lifters on the No. 4 cylinder are tight. If not, turn the crankshaft 1 revolution (360 degrees) and align the pointer with the TDC mark on the crankshaft pulley.
6.
7. Check the following valves:

Both No. 1 intake valves

Both No. 2 exhaust valves

Both No. 3 exhaust valves

Both No. 6 intake valves

8.
9. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements that are out of specification. Intake valve clearance (cold) is 0.010-0.013 in. (0.26-0.34mm) and exhaust valve clearance (cold) is 0.011-0.015 in. (0.29-0.37mm).
10.
11. Turn the crankshaft 240 degrees and set the No. 3 cylinder to TDC of its compression stroke.
12.
13. Check the following valves:

Both No. 2 intake valves

Both No. 3 intake valves

Both No. 4 exhaust valves

Both No. 5 exhaust valves

14.
15. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements that are out of specification. Intake valve clearance (cold) is 0.010-0.013 in. (0.26-0.34mm) and exhaust valve clearance (cold) is 0.011-0.015 in. (0.29-0.37mm).
16.
17. Turn the crankshaft 240 degrees and set the No. 5 cylinder to TDC of its compression stroke.
18.
19. Check the following valves:

Both No. 1 exhaust valves

Both No. 4 intake valves

Both No. 5 intake valves

Both No. 6 exhaust valves

20.
21. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements that are out of specification. Intake valve clearance (cold) is 0.010-0.013 in. (0.26-0.34mm) and exhaust valve clearance (cold) is 0.011-0.015 in. (0.29-0.37mm).
22.
23. If all the valve clearances are within specification, install the cylinder head cover, spark plugs and the intake manifold collector.
24.

Fig. Measure the valves indicated while the No. 1 piston is at TDC on the compression stroke-3.0L and 3.5L engines

Fig. Measure the valves indicated while the No. 3 piston is at TDC on the compression stroke-3.0L and 3.5L engines

Fig. Measure the valves indicated while the No. 5 piston is at TDC on compression-3.0L and 3.5L engines

## 3.0L Engine

NOTE
Check and adjust the valve clearances while the engine is cold and not running.

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2.
3. If an adjustment is necessary, adjust the valve clearance while engine is cold by removing the adjusting shim. The adjusting shim can be removed by using the following procedures:
1. Turn the crankshaft so the camshaft lobe of the valve to be adjusted is pointed straight up.
2.
3. Turn the lifter so the notch is pointed towards the center of the cylinder head; this will facilitate the shim removal process.
4.
5. Using a depressor tool, push down on the lifter and insert a keeper tool on the edge of the lifter to keep the lifter in the depressed position.
6.
7. Remove the depressor tool and remove the shim with a magnet.
NOTE
Compressed air can be blown into the hole of the lifter to separate the adjusting shim from the lifter.

8.

4.
5. Determine the replacement adjusting shim size by using the following procedures and formula:
1. Using a micrometer determine thickness of the removed shim.
2.
3. Calculate the thickness of a new adjusting shim so valve clearance is within the specified values.
4.
5. R = thickness of the removed shim.
6.
7. N = thickness of the new shim.
8.
9. M = measured valve clearance.

Intake shim determination formula: N = R + (M - 0.0118 in. or 0.30mm)

Exhaust shim determination formula: N = R + (M - 0.0130 in. or 0.33mm)

10.

6.
7. Shims are available in 64 sizes from 0.0913-0.1161 in. (2.32-2.95mm) in steps of 0.004 in. (0.01mm). The thickness is stamped on the shim; this side is always installed facing down. Select new shims with thickness as close as possible to calculated valve and install it in the lifter.
8.
9. Install the new shim onto the lifter.
10.
11. Depress the lifter and remove the keeper tool. Remove the depressor tool and recheck the valve clearance. Repeat this procedure for any other valves requiring adjustment.
12.
13. When all valve adjustments are finished, install the cylinder head cover, spark plugs and the intake manifold collector.
14.

Checking Valve Lash
1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2.
3. Remove or disconnect the following:

Intake manifold collector

Left and right rocker covers

Spark plugs

4.
5. Set the No. 1 cylinder at Top Dead center (TDC) on its compression stroke. Align the pointer with the TDC mark on the crankshaft pulley. Check that the valve lifters on the No. 1 cylinder are loose and valve lifters on the No. 4 cylinder are tight. If not, turn the crankshaft 1 revolution (360 degrees) and align the pointer with the TDC mark on the crankshaft pulley.
6.
7. Check the following valves:

Both No. 1 intake valves

Both No. 2 exhaust valves

Both No. 3 exhaust valves

Both No. 6 intake valves

Fig. Measure the valves indicated while the No. 1 piston is at TDC on the compression stroke-3.0L engine

8.
9. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements that are out of specification. Intake valve clearance (cold) is 0.010-0.013 in. (0.26-0.34mm) and exhaust valve clearance (cold) is 0.011-0.015 in. (0.29-0.37mm).
10.
11. Turn the crankshaft 240 degrees and set the No. 3 cylinder to TDC of its compression stroke.
12.
13. Check the following valves:

Both No. 2 intake valves

Both No. 3 intake valves

Both No. 4 exhaust valves

Both No. 5 exhaust valves

Fig. Measure the valves indicated while the No. 3 piston is at TDC on the compression stroke-3.0L engine

14.
15. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements that are out of specification. Intake valve clearance (cold) is 0.010-0.013 in. (0.26-0.34mm) and exhaust valve clearance (cold) is 0.011-0.015 in. (0.29-0.37mm).
16.
17. Turn the crankshaft 240 degrees and set the No. 5 cylinder to TDC of its compression stroke.
18.
19. Check the following valves:

Both No. 1 exhaust valves

Both No. 4 intake valves

Both No. 5 intake valves

Both No. 6 exhaust valves

Fig. Measure the valves indicated while the No. 5 piston is at TDC on compression-3.0L engine

20.
21. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements that are out of specification. Intake valve clearance (cold) is 0.010-0.013 in. (0.26-0.34mm) and exhaust valve clearance (cold) is 0.011-0.015 in. (0.29-0.37mm).
22.
23. If all the valve clearances are within specification, install the cylinder head cover, spark plugs and the intake manifold collector.
24.

## 3.5L Engine

NOTE
Check and adjust the valve clearances while the engine is cold and not running.

1. Before servicing the vehicle, refer to the Precautions Section.
2.
3. If an adjustment is necessary, adjust the valve clearance while engine is cold by removing the adjusting shim. The adjusting shim can be removed by using the following procedures:
1. Turn the crankshaft so the camshaft lobe of the valve to be adjusted is pointed straight up.
2.
3. Turn the lifter so the notch is pointed towards the center of the cylinder head; this will facilitate the shim removal process.
4.
5. Using a depressor tool, push down on the lifter and insert a keeper tool on the edge of the lifter to keep the lifter in the depressed position.
6.
7. Remove the depressor tool and remove the shim with a magnet.
NOTE
Compressed air can be blown into the hole of the lifter to separate the adjusting shim from the lifter.

8.

4.
5. Determine the replacement adjusting shim size by using the following procedures and formula:
1. Using a micrometer determine thickness of the removed shim.
2.
3. Calculate the thickness of a new adjusting shim so valve clearance is within the specified values.
4.
5. R = thickness of the removed shim.
6.
7. N = thickness of the new shim.
8.
9. M = measured valve clearance.

Intake shim determination formula: N = R + (M - 0.0118 in. or 0.30mm)

Exhaust shim determination formula: N = R + (M - 0.0130 in. or 0.33mm)

10.

6.
7. Shims are available in 64 sizes from 0.0913-0.1161 in. (2.32-2.95mm) in steps of 0.004 in. (0.01mm). The thickness is stamped on the shim; this side is always installed facing down. Select new shims with thickness as close as possible to calculated valve and install it in the lifter.
8.
9. Install the new shim onto the lifter.
10.
11. Depress the lifter and remove the keeper tool. Remove the depressor tool and recheck the valve clearance. Repeat this procedure for any other valves requiring adjustment.
12.
13. When all valve adjustments are finished, install the cylinder head cover, spark plugs and the intake manifold collector.
14.

Checking Valve Lash
1. Before servicing the vehicle, refer to the Precautions Section.
2.
3. Remove or disconnect the following:

Intake manifold collector

Left and right valve covers

Spark plugs

4.
5. Set the No. 1 cylinder at Top Dead Center (TDC) on its compression stroke. Align the pointer with the TDC mark on the crankshaft pulley. Check that the valve lifters on the No. 1 cylinder are loose and valve lifters on the No. 4 cylinder are tight. If not, turn the crankshaft 1 revolution (360 degrees) and align the pointer with the TDC mark on the crankshaft pulley.
6.
7. Check the following valves:

Both No. 1 intake valves

Both No. 2 exhaust valves

Both No. 3 exhaust valves

Both No. 6 intake valves

Fig. Measure the valves indicated while the No. 1 piston is at TDC on the compression stroke-3.5L engine

8.
9. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements that are out of specification.

Intake valve clearance (cold) is 0.010-0.013 in. (0.26-0.34mm) and exhaust valve clearance (cold) is 0.011-0.015 in. (0.29-0.37mm).

Intake valve clearance (warm) is 0.012-0.016 in. (0.30-0.41mm) and exhaust valve clearance (warm) is 0.012-0.017 in. (0.30-0.43mm).

10.
11. Turn the crankshaft 240 degrees and set the No. 3 cylinder to TDC of its compression stroke.
12.
13. Check the following valves:

Both No. 2 intake valves

Both No. 3 intake valves

Both No. 4 exhaust valves

Both No. 5 exhaust valves

Fig. Measure the valves indicated while the No. 3 piston is at TDC on the compression stroke-3.5L engine

14.
15. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements that are out of specification.

Intake valve clearance (cold) is 0.010-0.013 in. (0.26-0.34mm) and exhaust valve clearance (cold) is 0.011-0.015 in. (0.29-0.37mm).

Intake valve clearance (warm) is 0.012-0.016 in. (0.30-0.41mm) and exhaust valve clearance (warm) is 0.012-0.017 in. (0.30-0.43mm).

16.
17. Turn the crankshaft 240 degrees and set the No. 5 cylinder to TDC of its compression stroke.
18.
19. Check the following valves:

Both No. 1 exhaust valves

Both No. 4 intake valves

Both No. 5 intake valves

Both No. 6 exhaust valves

Fig. Measure the valves indicated while the No. 5 piston is at TDC on compression-3.5L engine

20.
21. Using a feeler gauge, measure the clearance between the valve lifter and the camshaft. Record any valve clearance measurements that are out of specification.

Intake valve clearance (cold) is 0.010-0.013 in. (0.26-0.34mm) and exhaust valve clearance (cold) is 0.011-0.015 in. (0.29-0.37mm).

Intake valve clearance (warm) is 0.012-0.016 in. (0.30-0.41mm) and exhaust valve clearance (warm) is 0.012-0.017 in. (0.30-0.43mm).

22.
23. If all the valve clearances are within specification, install the cylinder head cover, spark plugs and the intake manifold collector.
24.

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