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EM-46Revision: November 2009
CAMSHAFT
2006 QX56
CAMSHAFTPFP:13001
Removal and InstallationEBS00RF8
* Refer to GI-46, "Recommended Chemical Products and Sealants" .
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 washer6. 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)
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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 LH bank timing chain tensioner 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.
c. Remove the bolts and the timing chain tensioner.
KBIA0400J
Tool number : KV10111100 (J-37228)
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EM-48Revision: November 2009
CAMSHAFT
2006 QX56
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.
6. Remove the RH bank timing chain tensioner cover from the front cover using Tool.
CAUTION:
Do not damage mating surfaces.
7. Remove the RH bank timing chain tensioner 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.
c. Remove the bolts and the RH bank timing chain tensioner (A). NOTE:
If it is difficult to push plunger on RH bank timing chain tensioner
(A), remove the plunger under extended condition.
KBIA2483E
Tool number : KV10111100 (J-37228)
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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.
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EM-50Revision: November 2009
CAMSHAFT
2006 QX56
INSPECTION AFTER REMOVAL
Camshaft Runout
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 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 & exhaust)
: 44.465 - 44.655 mm
(1.7506 - 1.7581 in)
Cam wear limit
(intake & exhaust) : 0.02 mm (0.0008 in)
PBIC0039E
Standard diameter : 25.953 - 25.970 mm
(1.0218 - 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
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Camshaft End Play
Install dial gauge in the thrust direction on the front end of the
camshaft. 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 cam-
shaft and measure again.
If measurement is still out of the specified range, replace the cyl-
inder 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 cam-
shaft 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 specification, 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-55, "
Va l v e
Clearance" .
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-52Revision: November 2009
CAMSHAFT
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Valve Lifter Clearance
Valve Lifter Diameter
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 White
—Ye s
EXH —Light blue Yes
LH INT White
—No
EXH —Light blue No
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3. Install the RH bank (B) and LH bank (D) camshaft brackets.
Install by referring to the installation location mark (E) on the
upper surface.
Install so that the installation location mark (E) can be cor-
rectly read when viewed from the intake manifold side.
Install No. 1 camshaft bracket using the following procedure:
a:11 mm (0.43 in)
b: 2.0 - 3.0 mm (0.079 - 0.118 in) dia.
–Apply liquid gasket to No. 1 camshaft bracket as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-46, "
Recommended Chemical Products and Sealants".
CAUTION:
After installation, be sure to wipe off any excessive liq-
uid gasket leaking from part (C) and (D) both on RH and
LH sides.
Remove completely any excess of liquid gasket inside
bracket.
a:2.6 - 3.6 mm (0.102 - 0.142 in) dia.
–Apply liquid gasket (C) to the back side of the LH (A) bank
front cover and RH (B) bank front cover as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-46, "
Recommended Chemical Products and Sealants".
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