Nissan Altima L32. Manual - part 628

EM-48

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CAMSHAFT

5. Install camshaft sprockets.

• Install them by lining up the mating marks on each camshaft

sprocket with the ones painted on the timing chain during

removal.

• Before installation of chain tensioner, it is possible to re-match

the marks on timing chain with the ones on each sprocket.   

CAUTION:

• Aligned mating marks could slip. Therefore, after match-

ing them, hold the timing chain in place by hand.

• Before and after installing chain tensioner, check again to

make sure that mating marks have not slipped.

6. Install chain tensioner.

CAUTION:

• After installation, pull the stopper pin off completely, and make sure that the tensioner is fully

released.

7. Install chain guide.
8. Install IVT control cover with the following procedure.
a. Install IVT control solenoid valve to intake valve timing control

cover.

b. Install O-ring to front cover side. 
c.

Apply Genuine Silicone RTV Sealant to the positions as shown.

Refer to 

GI-15, "Recommended Chemical Products and Seal-

ants"

.

d. Install IVT control cover.

• Tighten the bolts in the numerical order as shown.

9. Check and adjust valve clearances. Refer to 

EM-49, "Valve

Clearance"

.

10. Installation of the remaining components is in the reverse order

as shown.

Inspection After Installation

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Inspection of Camshaft Sprocket (INT) Oil Groove

WARNING:

• Check when engine is cold so as to prevent burns from any splashing engine oil.

CAUTION:

• Perform this inspection only when DTC P0011 is detected in self-diagnostic results of CONSULT III

and it is directed according to inspection procedure of EC section. Refer to 

EC-152, "Diagnosis Pro-

cedure"

 (California), 

EC-681, "Diagnosis Procedure"

 (Except California).

1. Check engine oil level. Refer to 

LU-10, "Changing Engine Oil"

.

2. Perform the following procedure so as to prevent the engine from being unintentionally started while

checking.

a. Release fuel pressure. Refer to 

EC-550, "Inspection"

 (California), 

EC-1038, "Inspection"

 (Except Califor-

nia).

b. Disconnect ignition coil and injector harness connectors if practical.
3. Support engine using a suitable hoist or jack.
4. Remove the RH engine mounting bracket, mounting insulator and support bracket. Refer to 

EM-72,

"Removal and Installation"

.

Diameter (A)

: 3.0 - 4.0 mm (0.118 - 0.157 in)

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CAMSHAFT

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5. Remove IVT control solenoid valve. Refer to 

EM-41

.

6. Crank engine, and then make sure that engine oil comes out

from IVT control cover oil hole. End cranking after checking.

WARNING:

Be careful not to touch rotating parts (drive belts, idler pul-

ley, and crankshaft pulley, etc.).

CAUTION:

• Engine oil may squirt from IVT control solenoid valve

installation hole during cranking. Use a shop cloth to pre-

vent engine oil from splashing on worker, engine compo-

nents and vehicle. 

• Do not allow engine oil to get on rubber components such

as drive belts or engine mount insulators. Immediately

wipe off any splashed engine oil.

7. Clean oil groove between oil strainer and IVT control solenoid valve if engine oil does not come out from

IVT control cover oil hole. Refer to 

LU-7, "Lubrication Circuit"

.

8. Remove components between IVT control solenoid valve and camshaft sprocket (INT), and then check

each oil groove for clogging.

• Clean oil groove if necessary. Refer to 

LU-7, "Lubrication Circuit"

.

9. After inspection, installation of the remaining components is in the reverse order of removal.

Valve Clearance

INFOID:0000000004202124

Inspection

• Perform this inspection as follows after removal, installation, or replacement of the camshaft or any valve-

related parts, or if there are any unusual engine conditions due to changes in valve clearance over time

(starting, idling, and/or noise). 

1. Warm up the engine, then stop it.
2. Remove front RH engine under cover using power tool. 
3. Remove the rocker cover using power tool.

Refer to 

EM-39, "Removal and Installation"

.

4. Turn crankshaft pulley in normal direction (clockwise when

viewed from front) to align TDC identification mark (without paint

mark) with timing indicator.

5. At this time, check that the both intake and exhaust cam lobes of

No. 1 cylinder face outside.

• If they do not face outside, turn crankshaft pulley once more.

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CAMSHAFT

6. Measure valve clearances with a feeler gauge at locations

marked (X) in the table below.

• No.1 cylinder compression TDC.

• Use a feeler gauge to measure the clearance between valve

and camshaft. 

*Approximately 80

°C (176°F)

CAUTION:

If inspection was carried out with cold engine, check that values with fully warmed up engine are

still within specifications.

7. Turn crankshaft one complete revolution (360

°) and align mark on crankshaft pulley with pointer. 

8. Measure valve clearances with a feeler gauge at locations

marked (X) in the table below. 

• No.4 cylinder compression TDC.

• If out of specifications, make necessary adjustment.

ADJUSTMENT

• Perform adjustment depending on selected head thickness of valve lifter.

• The specified valve lifter thickness is the dimension at normal temperatures. Ignore dimensional differences

caused by temperature. Use the specifications for hot engine condition to adjust.

1. Remove camshaft. Refer to 

EM-41, "Removal and Installation"

.

2. Remove the valve lifters at the locations that are outside the standard.

Cylinder

No.1

No.2

No.3

No.4

     Valve

 INT

EXH

 INT

EXH

 INT

EXH

 INT

EXH

Measurable

×

×

×

x

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Valve clearance standard:
Cold

Intake

: 0.24 - 0.32 mm (0.009 - 0.013 in)

Exhaust

: 0.26 - 0.34 mm (0.010 - 0.013 in)

Hot*

Intake

: 0.304 - 0.416 mm (0.012 - 0.016 in)

Exhaust

: 0.308 - 0.432 mm (0.012 - 0.017 in)

Cylinder

No.1

No.2

No.3

No.4

    Valve

 INT

EXH

 INT

EXH

 INT

EXH

 INT

EXH

Measurable

 x

×

x

×

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3. Measure the center thickness of the removed valve lifters with a

micrometer.

4. Use the equation below to calculate valve lifter thickness for replacement.

• Valve lifter thickness calculation.

t = t1 + (C1 - C2)

t = Thickness of replacement valve lifter.

t1 = Thickness of removed valve lifter.

C1 = Measured valve clearance.

C2 = Standard valve clearance.

• Thickness of a new valve lifter can be identified by stamp

marks on the reverse side (inside the cylinder).

Stamp mark 696 indicates a thickness of 6.96 mm (0.2740 in)

Available thickness of valve lifter: 26 sizes with a range of

7.88 to 8.38 mm (0.3102 to 0.3299 in), in steps of 0.02 mm

(0.0008 in), when assembled at the factory.

5. Install the selected valve lifter.
6. Install camshaft.
7. Manually turn crankshaft pulley a few turns. 
8. Check that valve clearances for cold engine are within specifica-

tions, by referring to the specified values.

9. After completing the repair, check valve clearances again with the specifications for warmed engine. Use

a feeler gauge to measure the clearance between the valve and camshaft. Make sure the values are

within specifications.

*: Approximately 80

°C (176°F)

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Valve clearance standard:
Cold

Intake

: 0.24 - 0.32 mm (0.009 - 0.013 in)

Exhaust

: 0.26 - 0.34 mm (0.010 - 0.013 in)

Hot*

Intake

: 0.304 - 0.416 mm (0.012 - 0.016 in)

Exhaust

: 0.308 - 0.432 mm (0.012 - 0.017 in)

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