Nissan Primera P12. Manual — part 427
EM-54
[YD]
CAMSHAFT
CAMSHAFT
PFP:13001
Removal and Installation
EBS00SNW
CAUTION:
Apply new engine oil to parts marked in illustration before installation.
●
This engine will have a different valve arrangement from normal
DOHC 4-valve type engines. As both camshafts on this engine
have intake and exhaust camshafts, in this chapter they are
named as follows:
●
Refer to the figure for intake and exhaust valve arrangement.
(The camshafts have, alternately, either an intake valve or an
exhaust valve.)
REMOVAL
1.
Drain engine coolant. Refer to
CO-8, "Changing Engine Coolant"
.
2.
Remove air duct. Refer to
EM-15, "Removal and Installation"
.
3.
Remove rocker cover. Refer to
EM-52, "Removal and Installation"
.
4.
Remove vacuum pump. Refer to
EM-35, "Removal and Installation"
.
5.
Remove injection tube and fuel injector. Refer to
EM-39, "Removal and Installation"
.
6.
Remove secondary timing chain. Refer to
EM-63, "Removal and Installation"
.
SBIA0177E
1.
Camshaft bracket
2.
Camshaft (right side)
3.
Camshaft (left side)
4.
Camshaft sprocket (right side)
5.
Camshaft sprocket (left side)
6.
Adjusting shim
7.
Valve lifter
8.
Cylinder head
Camshaft (Right side)
: Intake manifold side
Camshaft (Left side)
: Exhaust manifold side
SBIA0178E
CAMSHAFT
EM-55
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7.
Set the No. 1 cylinder at TDC on its compression stroke.
8.
Remove the camshaft stroke.
●
Loosen the camshaft gear installation bolt by fixing the hexag-
onal portion of the camshaft.
9.
Remove the camshaft.
●
Place distinguishing marks on the right and left sides with
paint.
●
Loosen and remove the installation bolt in reverse order
shown in the figure.
10. Remove the adjusting shim and valve lifter.
●
Remove by taking notice of the installation position, and place
outside engine in order to prevent confusion.
INSPECTION AFTER REMOVAL
Visual Check of Camshaft
●
Check the camshaft for one sided wear or scratches.
●
Replace the camshaft if there are abnormalities.
Camshaft Runout
●
Prepare V-block on a flat surface and secure camshaft journals
No. 2 and No. 5.
●
Set the dial gauge vertically on journal No. 3.
●
Rotate camshaft in one direction by hand, then read needle
movement on dial indicator. (Total indicator reading)
Height of Cam Nose
Measure by using a micrometer.
JEM159G
JEM160G
Limit
: 0.02 mm (0.0008 in)
JEM161G
Standard:
Intake
: 39.505 - 39.695 mm (1.5553 - 1.5628 in)
Exhaust
: 39.905 - 40.095 mm (1.5711 - 1.5785 in)
SEM549A
EM-56
[YD]
CAMSHAFT
Camshaft Oil Clearance
Measure by using a micrometer.
Camshaft Bracket Inner Diameter
●
Install camshaft bracket and tighten bolts to the specified torque.
●
Measure inner diameter of camshaft bracket using an inside
micrometer.
Camshaft Oil Clearance Calculations
(Oil clearance) = (Camshaft bracket inner diameter) – (Camshaft journal outer diameter)
●
If it exceeds the standard value, refer to the standard value of each unit, then replace the camshaft and/or
cylinder head.
NOTE:
As the camshaft bracket is manufactured with the cylinder head, it is impossible to replace only the camshaft
bracket.
Camshaft End Play
●
Set the dial gauge to the front end of the camshaft. Measure the
end play by moving the camshaft in the direction of the axle.
●
If end play exceeds the limit, replace camshaft and measure
camshaft end play again.
●
If end play still exceeds the limit after replacing camshaft,
replace cylinder head.
Camshaft journal outer diameter:
Standard:
No. 1
: 30.435 - 30.455 mm
(1.1982 - 1.1990 in)
No. 2, 3, 4, 5
: 23.935 - 23.955 mm
(0.9423 - 0.9431 in)
SEM012A
Camshaft bracket inner diameter:
Standard:
No. 1
: 30.500 - 30.521 mm
(1.2008 - 1.2016 in)
No. 2, 3, 4, 5
: 24.000 - 24.021 mm
(0.9449 - 0.9457 in)
JEM162G
Standard
: 0.045 - 0.086 mm (0.0018 - 0.0034 in)
Standard
: 0.070 - 0.148 mm (0.0028 - 0.0058 in)
Limit
: 0.24 mm (0.0094 in)
PBIC0366E
CAMSHAFT
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Camshaft Sprocket Runout
1.
Install sprocket on camshaft.
2.
Measure camshaft sprocket runout.
3.
If it exceeds the limit, replace camshaft sprocket.
Visual Inspection of Valve Lifter and Adjusting Shim
●
Check lifter side for any signs of wear or damage. Replace if
there are any abnormalities.
●
Check cam nose contact and sliding surfaces for wear and
scratches. Replace if there are any abnormalities.
Valve Lifter Outer Diameter
Measure the outer diameter of the valve lifter with a micrometer.
Valve Lifter Bore Diameter
Measure the bore diameter of the cylinder head valve lifter with an
inside micrometer.
Valve Lifter Clearance Calculations
(Clearance) = (Valve lifter bore diameter) – (Valve lifter outer diameter)
If it exceeds the standard value, refer to the outer diameter and bore diameter standard values and replace
valve lifter and/or cylinder head.
Runout (Total indicator reading):
: Less than 0.15 mm (0.0059 in)
JEM164G
SEM160D
Standard
: 29.960 - 29.975 mm (1.1795 - 1.1801 in)
SEM961E
Standard
: 30.000 - 30.021 mm (1.1811 - 1.1819 in)
PBIC0367E
Standard
: 0.025 - 0.061 mm (0.0010 - 0.0024 in)
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