Infiniti QX56 (JA60). Manual - part 475

 

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Infiniti QX56 (JA60). Manual - part 475

 

 

EM-54

< ON-VEHICLE REPAIR >

CAMSHAFT

5. Obtain compression TDC of No. 1 cylinder as follows:
a. Turn the crankshaft pulley clockwise to align the TDC identifica-

tion notch (without paint mark) with the timing indicator on the

front cover. 

b. At this time, make sure both intake and exhaust cam lobes of

No. 1 cylinder (top front on LH bank) point outside.

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

6. Disconnect and remove the camshaft position sensor. Refer to 

EM-44, "Exploded View"

.

7. Disconnect and remove the intake valve timing control position sensor (RH and LH). Refer to 

EM-44,

"Exploded View"

.

8. Disconnect and remove the intake valve timing control solenoid valve (RH and LH). Refer to 

EM-44,

"Exploded View"

.

9. Remove the intake valve timing control solenoid cover RH bank

(A) and intake valve timing control solenoid cover LH bank (B)

as follows: 

a. Loosen and remove the bolts in reverse order as shown. 
b. Cut the liquid gasket and remove the covers using Tool.

CAUTION:

Do not damage mating surfaces.

10. Paint alignment marks on the RH bank (A) timing chain links (C)

and LH bank (B) timing chain links (D) and align with the cam-

shaft sprocket alignment marks (E) and (F).

11. Remove the chain tensioner (LH) using the following steps.

WARNING:

Plunger, spring, and spring seat pop out when squeezing return-proof clip without holding

plunger head. It may cause serious injuries. Always hold plunger head when removing.

KBIA2476E

KBIA0400J

Tool number

: KV10111100 (J-37228)

AWBIA0815ZZ

AWBIA0154ZZ

CAMSHAFT

EM-55

< ON-VEHICLE REPAIR >

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a. Squeeze return-proof clip ends using suitable tool and push the

plunger into the tensioner body.

b. Secure plunger using stopper pin.

• Stopper pin is made from hard wire approximately 1 mm (0.04

in) in diameter.

c. Remove the bolts and the timing chain tensioner.

NOTE:

• Stop plunger in the fully extended position using return-proof clip

(1) if stopper pin is removed.

• Push the plunger (2) into the tensioner body while squeezing the

return-proof clip (1). Secure it using stopper pin (3).

12. Remove the chain tensioner cover from the front cover using

Tool.

CAUTION:

Do not damage mating surfaces.

13. Remove the chain tensioner (RH) using the following steps.

WARNING:

Plunger, spring, and spring seat pop out when squeezing return-proof clip without holding

plunger head. It may cause serious injuries. Always hold plunger head when removing.

a. Squeeze return-proof clip ends using suitable tool and push the

plunger into the tensioner body.

b. Secure plunger using stopper pin.

• Stopper pin is made from hard wire approximately 1 mm (0.04

in) in diameter.

KBIA2479E

KBIA2483E

Tool number

: KV10111100 (J-37228)

KBIA2521E

KBIA2479E

EM-56

< ON-VEHICLE REPAIR >

CAMSHAFT

c.

Remove the bolts and the chain tensioner (RH) (A).

NOTE:

If it is difficult to push plunger on chain tensioner (RH) (A),

remove the plunger under extended condition.

14. Loosen camshaft sprocket bolts as shown and remove camshaft

sprockets.

CAUTION:

To avoid interference between valves and pistons, do not

turn crankshaft or camshaft with timing chain discon-

nected.

15. Remove the RH (A) front cover bolts and LH (B) front cover

bolts.

16. Remove RH (A) camshaft bracket bolts and LH (C) camshaft

bracket bolts in the reverse of order shown to remove camshaft

brackets.

• Remove No. 1 camshaft bracket.

NOTE:

The bottom and front surface of bracket will be stuck because

of liquid gasket.

: Engine front

• B: Exhaust side

• D: Intake side

WBIA0705E

KBIA2485E

WBIA0706E

WBIA0707E

CAMSHAFT

EM-57

< ON-VEHICLE REPAIR >

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17. Remove the camshaft.

INSPECTION AFTER REMOVAL

Camshaft Runout

1. Put V block on precise flat work bench, and support No. 1 and

No. 5 journals of the camshaft.

2. Set dial indicator vertically to No. 3 journal.
3. Turn the camshaft to one direction, and measure the camshaft

runout on dial indicator (total indicator reading).

• If measurement exceeds specification, replace the camshaft.

Camshaft Cam Height

• Measure the camshaft cam height.

• If measurement is not within the specifications, replace the cam-

shaft.

Camshaft Journal Clearance

 Camshaft Journal Diameter

• Measure the diameter of the camshaft journal.

Camshaft Bracket Inner Diameter

• Tighten the camshaft bracket bolt to the specified torque.

• Measure the inner diameter of the camshaft bracket.

Calculation of Camshaft Journal Clearance

(Journal clearance) = (camshaft bracket inner diameter) – (camshaft

journal diameter)

• If measurement is not within specification, replace either or both

camshaft and cylinder head.

NOTE:

The inner diameter of the camshaft bracket is manufactured together with the cylinder head. Replace the

whole cylinder head as an assembly.

Camshaft runout

: Less than 0.02 mm (0.0008 in)

EMK0641D

Standard cam height 
(intake)

: 44.865 - 45.055 mm 
(1.7663 - 1.7738 in)

Standard cam height (ex-
haust)

: 45.075 - 45.265 mm 
(1.7746 - 1.7821 in)

Cam wear limit
(intake & exhaust)

: 0.02 mm (0.0008 in)

PBIC0039E

Standard diameter : 25.950 - 25.970 mm 

(1.0217 - 1.0224 in)

PBIC0040E

Standard

: 26.000 - 26.021 mm (1.0236 - 1.0244 in)

Standard

: 0.030 - 0.071 mm (0.0012 - 0.0028 in)

PBIC1645E

 

 

 

 

 

 

 

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