Infiniti QX56 (JA60). Manual - part 466

 

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Infiniti QX56 (JA60). Manual - part 466

 

 

EM-18

< ON-VEHICLE MAINTENANCE >

CAMSHAFT VALVE CLEARANCE

CAMSHAFT VALVE CLEARANCE

Valve Clearance

INFOID:0000000005148982

INSPECTION

NOTE:

Perform the following inspection after removal, installation or replacement of camshaft or valve-related parts,

or if there are unusual engine conditions due to changes in valve clearance over time (starting, idling, and/or

noise).
1. Warm up the engine. Then stop the engine.
2. Remove the engine room cover. Refer to 

EM-24, "Removal and Installation"

.

3. Remove the air cleaner and air duct assembly. Refer to 

EM-25, "Removal and Installation"

.

4. Remove the RH bank and LH bank rocker covers using power tool. Refer to 

EM-38, "Removal and Instal-

lation"

.

5. Turn the crankshaft pulley in the normal direction (clockwise

when viewed from engine front) to align TDC identification notch

(without paint mark) with timing indicator.

6. At this time, make sure both the intake and exhaust cam noses

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

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

KBIA2476E

KBIA0400J

CAMSHAFT VALVE CLEARANCE

EM-19

< ON-VEHICLE MAINTENANCE >

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

7. Measure valve clearances at the locations marked “

×” as shown

in the table below (locations indicated with black arrow).

: Engine front

 (black): Measurable at No.1 cylinder compression top dead

center

 (white): Measurable at No. 3 cylinder compression top

dead center

• A:  RH

• B:  LH 

• C: Exhaust

• D: Intake

NOTE:

Firing order 1-8-7-3-6-5-4-2

• No. 1 cylinder compression TDC

• Measure valve clearance using suitable tool. Refer to 

EM-108,

"Standard and Limit"

.

CAUTION:

If the inspection was carried out with a cold engine, make

sure the values with a fully warmed up engine are still

within specifications.

8. Turn the crankshaft pulley clockwise 270

° from the position of No. 1 cylinder compression TDC to obtain

No. 3 cylinder compression TDC.

Measuring position (RH bank)

No. 2 cyl 

(E)

No. 4 cyl 

(F)

No. 6 cyl 

(G)

No. 8 cyl 

(H)

No. 1 cylinder at TDC

 EXH

 

×

INT

×

× 

Measuring position (LH bank)

No. 1 cyl 

(J)

No. 3 cyl 

(K)

No. 5 cyl 

(L)

No. 7 cyl 

(M)

No. 1 cylinder at TDC

INT

×

×

 

EXH

×

×

WBIA0713E

KBIA0185E

EM-20

< ON-VEHICLE MAINTENANCE >

CAMSHAFT VALVE CLEARANCE

9. Measure valve clearances at the locations marked “

×” as shown

in the table below (locations indicated with white arrow).

: Engine front

 (black): Measurable at No.1 cylinder compression top dead

center

 (white): Measurable at No. 3 cylinder compression top

dead center

• A:  RH

• B:  LH 

• C: Exhaust

• D:  Intake

NOTE:

Firing order 1-8-7-3-6-5-4-2

• No. 3 cylinder compression TDC

• Measure valve clearance using suitable tool. Refer to 

EM-108,

"Standard and Limit"

.

CAUTION:

If the inspection was carried out with a cold engine, make

sure the values with a fully warmed up engine are still

within specifications.

Measuring position (RH bank)

No. 2 cyl 

(E)

No. 4 cyl 

(F)

No. 6 cyl 

(G)

No. 8 cyl 

(H)

No. 3 cylinder at TDC

 EXH

 

×

INT

 

×

Measuring position (LH bank)

No. 1 cyl 

(J)

No. 3 cyl 

(K)

No. 5 cyl 

(L)

No. 7 cyl 

(M)

No. 3 cylinder at TDC

INT

×

× 

EXH

×

×

WBIA0713E

KBIA0185E

CAMSHAFT VALVE CLEARANCE

EM-21

< ON-VEHICLE MAINTENANCE >

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

10. Turn the crankshaft pulley clockwise 90

° from the position of No.

3 cylinder compression TDC (clockwise by 360

° from the posi-

tion of No. 1 cylinder compression TDC) to measure the intake

and exhaust valve clearances of No. 6 cylinder (G) and the

exhaust valve clearance of No. 2 cylinder (E).

: Front

• A:  RH

• B:  LH

• C: Exhaust

• D: Intake

• E: No. 2 cylinder 

• F: No. 4 cylinder

• G: No. 6 cylinder

• H: No. 8 cylinder

• J: No. 1 cylinder

• K: No. 3 cylinder

• L: No. 5 cylinder

• M: No. 7 cylinder

11. If out of specifications, adjust as necessary. 

ADJUSTMENT

NOTE:

• Perform adjustment depending on the selected head thickness of the 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 the camshaft. Refer to 

EM-53, "Removal and Installation"

.

2. Remove the valve lifters at the locations that are out of specification.
3. Measure the center thickness of the removed valve lifters using

suitable tool.

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

replacement.

• Valve lifter thickness calculation:

Thickness of replacement valve lifter = t1+ (C1 - C2)

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 N788 indicates 7.88 mm (0.3102 in) in thickness.

• Available thickness of valve lifter: 25 sizes with range 7.88 to

8.36 mm (0.3102 to 0.3291 in) in steps of 0.02 mm (0.0008 in)

(when manufactured at factory). Refer to 

EM-108, "Standard

and Limit"

.

5. Install the selected valve lifter.

WBIA0713E

KBIA0057E

KBIA0119E

 

 

 

 

 

 

 

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