Nissan Altima L32. Instruction — part 626

EM-40

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[QR25DE]

ROCKER COVER

1. Apply RTV Silicone Sealant to the joint part of the cylinder head

and camshaft bracket using the following steps:

• Use Genuine Silicone RTV Sealant, or equivalent. Refer to

GI-15

.

a. Follow illustration (a) to apply sealant to joint part of No.1 cam-

shaft bracket and cylinder head.

b. Follow illustration (b) to apply sealant in a 90

° degree angle to

the illustration (a).

2. Install the rocker cover and the new rocker cover gasket.

• The rocker cover gasket must be securely installed in the groove in the rocker cover.

3. Tighten the rocker cover bolts in two steps, in the numerical

order as shown.

4. Installation of the remaining components is in the reverse order of removal.

WBIA0164E

Step 1

: 1.96 N·m (0.20 kg-m, 17 in-lb)

Step 2

: 8.33 N·m (0.85 kg-m, 74 in-lb)

ALBIA0191ZZ

CAMSHAFT

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CAMSHAFT

Removal and Installation

INFOID:0000000004202122

REMOVAL

1. Remove the rocker cover. Refer to

EM-39, "Removal and Installation"

.

2. Remove the front right side tire and wheel. Refer to

WT-66, "Adjustment"

.

3. Remove the RH splash shield using power tool.
4. Remove the drive belt. Refer to

EM-16, "Removal and Installation"

.

5. Remove the power steering reservoir. Refer to

ST-19, "QR25DE : Exploded View"

.

6. Remove the coolant overflow reservoir tank.
7. Disconnect variable timing control solenoid and camshaft sensor harness connectors.
8. Remove camshaft sensor.
9. Remove camshaft sensor bracket.

AWBIA0591GB

1.

Camshaft bracket (No.1)

2.

Washer

3.

Front cover (partial view)

4.

Chain guide

5.

Chain tensioner

6.

O-ring(s)

7.

Chain tensioner spring

8.

Chain tensioner plunger

9.

IVT control solenoid valve

10. IVT control cover

11. Camshaft sprocket (EXH)

12. Camshaft sprocket (INT)

13. Valve lifter

14. Camshaft (EXH)

15. Camshaft (INT)

16. Camshaft brackets (EXH)

17. Camshaft brackets (INT)

18. Camshaft sensor bracket

A.

Follow installation for tightening steps

EM-42

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CAMSHAFT

10. Loosen the IVT control cover bolts in the order as shown.

• Remove the IVT control cover by cutting the sealant using

Tool.

11. Set the No.1 cylinder at TDC on its compression stroke with the

following procedure:

a. Open the splash cover on RH under cover.
b. Rotate crankshaft pulley clockwise, and align mating marks for

TDC with timing indicator on front cover, as shown.

c.

At the same time, make sure that the mating marks on camshaft

sprockets are lined up with the yellow links in the timing chain,

as shown.

• If not, rotate crankshaft pulley one more turn to line up the

mating marks to the yellow links, as shown.

12. Pull the timing chain guide out between the camshaft sprockets through front cover.

ALBIA0194ZZ

Tool number

: KV10111100 (J-37228)

WBIA0475E

KBIA0190E

KBIA0115E

CAMSHAFT

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13. Remove camshaft sprockets with the following procedure.

CAUTION:

• Do not rotate the crankshaft or camshaft while the timing

chain is removed. It causes interference between valve

and piston.

NOTE:

• Chain tension holding work is not necessary. Crankshaft

sprocket and timing chain do not disconnect structurally while

front cover is attached.

a. Line up the mating marks on camshaft sprockets with the yellow

links in the timing chain, and paint an indelible mating mark on

the sprocket and timing chain link plate.

b. Push in the tensioner plunger and hold. Insert a stopper pin into

the hole on tensioner body to hold the chain tensioner. Remove

the timing chain tensioner.

• Use a wire with 0.5 mm (0.02 in) diameter for a stopper pin.

c. Secure the hexagonal part of camshaft with a suitable tool.

Loosen the camshaft sprocket mounting bolts and remove the

camshaft sprockets.

14. Loosen the camshaft bracket bolts in the order as shown, and

remove the camshaft brackets and camshafts.

• Remove No.1 camshaft bracket by slightly tapping it with a

rubber mallet.

15. Remove the valve lifters.

• Check mounting positions, and set them aside in the order

removed.

INSPECTION AFTER REMOVAL

Camshaft Runout

1. Put the camshaft on a V-block supporting the No.2 and No.5

journals.

2. Set the dial gauge vertically on the No.3 journal.
3. Turn camshaft in one direction by hand, and measure the cam-

shaft runout on the dial gauge total indicator reading.

Camshaft Cam Height

KBIA0049E

KBIA0048E

WBIA0028E

Standard

: Less than 0.04 mm (0.0016 in)

PBIC0038E