Nissan Pathfinder. Manual — part 556

TIMING CHAIN

EM-63

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a. Pull lever down and release plunger stopper tab. Plunger stop-

per tab can be pushed up to release (coaxial structure with

lever).

b. Insert stopper pin into timing chain tensioner (primary) body hole

to hold lever, and keep the tab released. An Allen wrench [1.2

mm (0.047 in)] is used for a stopper pin as an example.

c. Insert plunger into tensioner body by pressing the slack guide.
d. Keep the slack guide pressed and hold it by pushing the stopper

pin through the lever hole and body hole.

e. Remove the bolts and remove the timing chain tensioner (pri-

mary).

7. Remove internal chain guide, tension guide and slack guide.

NOTE:

Tension guide can be removed after removing timing chain (pri-

mary).

8. Remove timing chain (primary) and crankshaft sprocket.

CAUTION:

After removing timing chains, do not turn the crankshaft and camshaft separately or the valves

will strike the pistons.

9. Remove timing chain (secondary) and camshaft sprockets as follows:

SEM732G

SEM733G

PBIC2266E

EM-64

< REMOVAL AND INSTALLATION >

TIMING CHAIN

a. Attach a suitable stopper pin (B) to the bank 1 (A) and bank 2

(C) timing chain tensioners (secondary) (1).

NOTE:

• Use approximately 0.5 mm (0.02 in) diameter hard metal pin

as a stopper pin.

• Removal of camshaft bracket (No. 1) is required prior to

removing the timing chain tensioner (secondary).

b. Remove camshaft sprockets (INT and EXH) bolts.

• Secure the hexagonal portion of camshaft using a wrench to

loosen bolts.

CAUTION:

Do not loosen bolts using anything other than the cam-

shaft hexagonal portion. Do not apply tension to the tim-

ing chain.

c.

Remove timing chain (secondary) together with camshaft sprockets.

• Turn camshaft slightly to keep the chain tight when removing the timing chain (secondary).

• Insert 0.5 mm (0.020 in) thick metal or resin plate between tim-

ing chain and timing chain tensioner plunger (guide) (E).

Remove timing chain (secondary) (2) together with camshaft

sprockets with timing chain loose from guide groove.

CAUTION:

Be careful of plunger coming off when removing timing chain (secondary). The plunger of timing

chain tensioner (secondary) moves during operation, which could cause the stopper pin to fall

out.

• Bank 1 shown.

d. Camshaft sprocket (INT) is two-for-one structure of sprockets for timing chain (primary) and for timing

chain (secondary).

CAUTION:

• Handle camshaft sprocket (INT) carefully to avoid any

shock to camshaft sprocket.

• Do not disassemble. [Do not loosen bolts (A) as shown].

INSPECTION

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(1)

: Timing chain tensioner (secondary)

(A)

: Bank 1

(B)

: View B

(C)

: Stopper pin

(D)

: Plate

(F)

: Timing chain tensioner (body)

JPBIA2527ZZ

PBIC2980E

TIMING CHAIN

EM-65

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Check for cracks and any excessive wear of the timing chain. Replace the timing chain as necessary.

INSTALLATION

NOTE:

This illustration shows the relationship between the mating mark on each timing chain and on the correspond-

ing sprocket with the components installed.
1. Install timing chain tensioners (secondary) with a new O-ring and the stopper pin attached.

CAUTION:

Do not reuse O-ring.

2. Check that dowel pin (A) and crankshaft key (1) are located as

shown. (No. 1 cylinder at compression TDC)

NOTE:

Though camshaft does not stop at the position as shown, for the

placement of cam nose, it is generally accepted camshaft is

placed in the same direction.

3. Install timing chain (secondary) and camshaft sprockets (INT and EXH) as follows:

CAUTION:

Mating marks between timing chain and sprockets slip easily. Confirm all mating mark positions

repeatedly during the installation process.

1.

Internal chain guide

2.

Camshaft sprocket (INT)

3.

Mating mark (pink link)

4.

Mating mark (punched)

5.

Timing chain tensioner (secondary) 6.

Mating mark (orange link)

7.

Timing chain (secondary)

8.

Camshaft sprocket (EXH)

9.

Tension guide

10. Water pump

11. Crankshaft sprocket

12. Mating mark (notched)

13. Timing chain (primary)

14. Slack guide

15. Timing chain tensioner (primary)

16. Mating mark (back side)

17. Crankshaft key

Camshaft dowel pin

: At cylinder head upper face side in each bank

Crankshaft key

: At cylinder head side of bank 1

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EM-66

< REMOVAL AND INSTALLATION >

TIMING CHAIN

a. Push plunger of timing chain tensioner (secondary) and keep it

pressed in with stopper pin (A).

b. Install timing chain (secondary) (2) and camshaft sprockets [INT

(1) and EXH (3)].

NOTE:

Bank 1 shown (rear view).

• Align the mating marks on timing chain (secondary) (orange

link) with the mating marks on camshaft sprockets (INT and

EXH), and install them.

• Align dowel pin on camshafts with the groove on sprockets,

and install them.

• Tighten the bolts for the camshaft sprockets by hand enough

to prevent the dowel pins from falling out of the grooves.

• It may be difficult to visually check the dislocation of mating

marks during and after installation. To make the matching eas-

ier, make a mating mark (A) on the top of sprocket teeth and

its extended line with paint.

4. After confirming the mating marks are aligned, tighten the cam-

shaft sprocket bolts.

• Secure the camshaft using a wrench at the hexagonal portion

to tighten the bolts.

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(A)

: Dowel pin groove

(B)

: Mating mark (2 oblong on rear face)

(C)

: Orange link

(D)

: Mating mark (2 circles on rear face)

(E)

: Mating mark (Oblong on rear face)

(F)

: Dowel pin groove

(G)

: Mating mark (Circle on rear face)

(H)

: Orange link

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(B)

: Mating mark (orange link)

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