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
7. Disconnect and remove the intake valve timing control position sensor (RH and LH). Refer to
8. Disconnect and remove the intake valve timing control solenoid valve (RH and LH). Refer to
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 >
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
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 >
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
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
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст