Nissan Frontier D40. Manual - part 578

EM-44

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[QR25DE]

TIMING CHAIN

Removal and Installation

INFOID:0000000005274284

REMOVAL

1.

Remove engine under cover. Refer to 

EXT-13, "Removal and Installation"

.

2.

Release the fuel pressure. Refer to 

EC-454, "Fuel Pressure Check"

.

3.

Remove the air cleaner case and air duct and resonator assembly. Refer to 

EM-25, "Removal and Instal-

lation"

.

4.

Remove the spark plugs. Refer to 

EM-18, "Removal and Installation"

.

5.

Remove the rocker cover. Refer to

EM-36, "Removal and Installation"

.

6.

Remove the coolant overflow reservoir tank.

7.

Remove the drive belt auto-tensioner. Refer to 

EM-15, "Removal and Installation of Drive Belt Auto Ten-

sioner"

.

8.

Remove the generator. Refer to 

CHG-20, "Removal and Installation - QR25DE Models"

.

9.

Remove the strut tower brace. Refer to 

FSU-12, "Component"

.

10. Dismount and position aside the A/C compressor with the piping attached.
11. Dismount and position aside the power steering pump and reservoir tank with the piping attached.

12. Remove the oil pan, and oil strainer. Refer to 

EM-32, "Removal and Installation"

.

13. Remove IVT control cover bolts in the order as shown.
14. Remove the IVT control cover by cutting the sealant using Tool.

15. Pull chain guide between camshaft sprockets out through front

cover.

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

following procedure: 

a.

Rotate the crankshaft pulley clockwise and align the mating
marks to the timing indicator on the front cover.

b.

At the same time, make sure that the mating marks on the cam-
shaft sprockets are lined up as shown.

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

the mating marks to the positions as shown.

Tool number

: KV10111100 (J-37228)

KBIA0085E

KBIA0190E

KBIA0115E

TIMING CHAIN

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17. Remove crankshaft pulley with the following procedure:

a.

Hold the crankshaft pulley with a suitable tool, then loosen the
crankshaft pulley bolt, and pull the pulley out about 10 mm (0.39
in). Remove the crankshaft pulley bolt.

b.

Attach a pulley puller in the M6 (0.24 in diameter) thread hole on
crankshaft pulley, and remove crankshaft pulley. 

18. If the front oil seal needs to be replaced, remove it using a suit-

able tool. 

19. Remove the front cover as follows:

a.

Loosen the front cover bolts in the order as shown, and remove
them.

b.

Remove the front cover.

CAUTION:

• Be careful not to damage the mating surface.

KBIA0077E

KBIA0078E

SEM829E

WBIA0032E

EM-46

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[QR25DE]

TIMING CHAIN

20. Remove timing chain with the following procedure:

a.

Push in chain tensioner plunger. Insert a stopper pin into hole on chain tensioner body to secure chain
tensioner plunger and remove chain tensioner.
NOTE:
Use approximately 0.5 mm (0.02 in) dia. hard metal pin as a
stopper pin.

b.

Remove timing chain.

CAUTION:

Do not rotate crankshaft or camshaft while timing chain is removed. It causes interference
between valve and piston.

21. Remove camshaft sprockets. Refer to 

EM-52

.

22. Remove timing chain slack guide, timing chain tension guide and spacer.

23. Remove balancer unit timing chain tensioner with the following procedure:
a.

Lift lever up, and release ratchet claw for return proof.

b.

Push tensioner sleeve in, and hold it.

c.

Matching the hole on lever with the one on body, insert a stopper
pin to secure tensioner sleeve.
NOTE:
Use approximately 1 mm (0.04 in) dia. hard metal pin as a stop-
per pin.

d.

Remove balancer unit timing chain tensioner.

24. Secure the hexagonal portion of the balancer shaft using a suitable tool. Loosen the balancer unit

sprocket bolt.

25. Remove balancer unit timing chain, balancer unit sprocket and crankshaft sprocket.

NOTE:
When removing balancer unit timing chain, remove crankshaft sprocket and balancer unit sprocket at the
same time.

26. Loosen bolts in reverse order as shown, and remove balancer

unit.

CAUTION:

Do not disassemble balancer unit.
NOTE:
Use TORX socket (size E14) for bolts No.1 to 4.

INSPECTION AFTER REMOVAL

Timing Chain

KBIA0048E

PBIC3027E

PBIC3028E

TIMING CHAIN

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Check timing chain for cracks and any excessive wear at the roller
links of timing chain. Replace timing chain if necessary.

Balancer Unit Bolt Outer Diameter

• Measure outer diameters [(d1), (d2)] at two positions as shown.
• If reduction appears in (A) range, regard it as (d2).

• If it exceeds the limit (large difference in dimensions), replace bal-

ancer unit bolt with a new one.

Balancer Unit Bolt Length

Measure balancer unit bolt length. If it exceeds the limit, replace balancer unit bolt with a new one.

INSTALLATION

NOTE:
The figure shows the relationship between the mating mark on each
timing chain and that on the corresponding sprocket, with the com-
ponents installed.

1.

Make sure that crankshaft key points straight up.

2.

Install O-ring to balancer unit.

PBIC0282E

Limit [(d1) – (d2)]

: 0.15 mm (0.0059 in)

PBIC1137E

Limit

: 172 mm (6.77 in)

PBIC3029E