2007 INFINITI QX56 service

TIMING CHAINEM-45
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b. Select the one most visible notch of the four on the bolt flange.
Corresponding to the selected notch, put a alignment mark
(such as paint) on the crankshaft pulley.
14. Rotate the crankshaft pulley in normal direction (clockwise when viewed from engine front) to check for parts interference.
15. Installation of the remaining components is in the reverse of order of removal.Crankshaft pulley bolt torque
Step 1 : 93.1 N·m (9.5 kg-m, 69 ft-lb)
Step 2 : additional 90
° (angle tightening)
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EM-46
< SERVICE INFORMATION >
CAMSHAFT
CAMSHAFT
Removal and InstallationINFOID:0000000003531534
NOTE:
Do not remove the engine assembly to perform this procedure.
REMOVAL
1. Remove the RH bank and LH bank rocker covers. Refer to EM-35, "Removal and Installation".
2. 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.
1. Cylinder head RH bank 2. Camshaft bracket (No. 2, 3, 4, 5) 3. Valve lifter
4. Camshaft bracket (No. 1) 5. Seal washer 6. Camshaft RH bank EXH
7. Camshaft RH bank INT 8. Camshaft LH bank INT 9. Camshaft LH bank EXH
10. Camshaft sprocket RH bank EXH 11. Camshaft sprocket RH bank INT 12. Camshaft sprocket LH bank INT
13. Camshaft sprocket LH bank EXH 14. Camshaft position sensor (PHASE) 15. O-ring
16. Cylinder head LH bank A. Follow installation procedure
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CAMSHAFTEM-47
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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.
3. Remove the chain case cover RH bank (A) and chain case cover LH bank (B) as follows:
a. Loosen and remove the bolts as shown.
b. Cut the liquid gasket and remove the covers using Tool.
CAUTION:
Do not damage mating surfaces.
4. Paint alignment marks on the RH bank (A) timing chain links (C) LH (B) timing chain links (D) and aligning with the camshaft
sprocket alignment marks (E) and (F).
5. 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.
a. Squeeze return-proof clip ends using suitable tool and push the plunger into the chain tensioner body.
b. Secure plunger using stopper pin. • Stopper pin is made from hard wire approximately 1 mm (0.04in) in diameter.
c. Remove the bolts and the chain tensioner.
NOTE:
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Tool number : KV10111100 (J-37228)
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EM-48
< SERVICE INFORMATION >
CAMSHAFT
• Stop plunger in the fully extended position using return-proof clip 1if stopper pin is removed.
• Push the plunger 2 into the chain tensioner body while squeezing
the return-proof clip 1. Secure it using stopper pin 3.
6. Remove the chain tensioner cover from the front cover using Tool.
CAUTION:
Do not damage mating surfaces.
7. 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 chain 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 chain tensioner (RH) (A). NOTE:
If it is difficult to push plunger on chain tensioner (RH) (A),
remove the plunger under extended condition.
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Tool number : KV10111100 (J-37228)
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CAMSHAFTEM-49
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8. 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.
9. Remove the RH front cover bolts (A) and LH front cover bolts (B).
10. 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
• D: Intake
11. Remove the camshaft.
12. Remove the valve lifters if necessary. • Correctly identify location where each part is removed from.
Keep parts organized to avoid mixing them up.
INSPECTION AFTER REMOVAL
Camshaft Runout
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EM-50
< SERVICE INFORMATION >
CAMSHAFT
1. Put V block on precise flat work bench, and support No. 1 andNo. 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 specif ication, 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 spec ification, replace either or both
camshaft and cylinder head.
NOTE:
The inner diameter of the camshaft bracket is manuf actured together with the cylinder head. Replace the
whole cylinder head as an assembly.
Camshaft End Play
Camshaft runout : Less than 0.02 mm (0.0008 in)
EMK0641D
Standard cam height
Intake: : 45.865 - 45.055 mm
(1.7663 - 1.7738 in)
Standard Cam height
Exhaust: : 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 - 0.068 mm (0.0012 - 0.0027 in)
PBIC1645E

CAMSHAFTEM-51
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• Install dial gauge in the thrust direction on the front end of the cam-
shaft. Measure the end play when the camshaft is moved forward/
backward (in direction to axis).
• If measurement is out of the specified range, replace the camshaft and measure again.
• If measurement is still out of t he specified range, replace the cylin-
der head.
• Measure the following parts if end play is outside the specified value.
- Dimension ″A ″ for camshaft No. 1 journal
- Dimension ″B ″ for cylinder head No. 1 journal
• If measurements are not within specification, replace the camshaft and/or cylinder head.
Camshaft Sprocket Runout
1. Install the camshaft in the cylinder head.
2. Install the camshaft sprocket to the camshaft.
3. Measure the camshaft sprocket runout.
• If measurement exceeds the s pecification, replace the cam-
shaft sprocket.
Valve Lifter
Check if the surface of the valve lifter has any wear or cracks.
• If any damage is found, replace the valve lifter.
• Select the thickness of the head so that the valve clearance is within the standard when replacing. Refer to EM-56, "
Valve Clear-
ance".
Valve Lifter Clearance
Valve Lifter Diameter
Standard : 0.115 - 0.188 mm (0.0045 - 0.0074 in)
PBIC0042E
Standard : 30.500 - 30.548 mm (1.2008-1.2027 in)
Standard : 30.360 - 30.385 mm (1.1953-1.1963 in)
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Runout : Less than 0.15 mm (0.0059 in)
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EM-52
< SERVICE INFORMATION >
CAMSHAFT
• Measure the diameter of the valve lifter.
Valve Lifter Hole Diameter• Measure the diameter of the valve lifter hole of the cylinder head,using suitable tool.
Calculation of Valve Lifter Clearance
(Valve lifter clearance) = (valve lifter hole diameter) – (valve lifter
diameter)
• If the measurement is not within specification, referring to each specification of the valve lifter diameter and hole diameter, replace
either or both the valve lifter and cylinder head.
INSTALLATION
1. Install the valve lifters if removed. • Install removed parts in their original locations.
2. Install the camshafts. Refer to the table below for identification of the RH and LH, and intake and exhaust.
• Install so that the RH bank (B) dowel pins (A) and LH bank (C)dowel pins (A) at the front of the camshaft face are in the
direction shown.Standard : 33.977 - 33.987 mm (1.3377 - 1.3381 in)
JEM798G
Standard : 34.000 - 34.016 mm (1.3386 - 1.3392 in)
Standard : 0.013 - 0.039 mm (0.0005 - 0.0015 in)
PBIC0043E
Bank INT EXH
Identification
paint (front) Identification
paint (rear) Identification
rib
RH INT Pink — Yes
EXH — Orange Yes
LH INT Pink — No
EXH — Orange No
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