2006 NISSAN PATROL Service Manual

CAMSHAFT VISUAL CHECK
Check camshaft for scratches, seizure and wear.
CAMSHAFT END PLAY
1. Install camshaft in cylinder head.
2. Measure camshaft end play.
Camshaft end play:
0.065 - 0.169 mm (0.0026 - 0.0067 in)
CAMSHAFT JOURNAL CLEARANCE
1. Measure the inner diameter of camshaft bearing.
Standard inner diameter:
30.000 - 30.021 mm (1.1811 - 1.1819 in)
2. Measure the outer diameter of camshaft journal.
Standard outer diameter:
29.935 - 29.955 mm (1.1785 - 1.1793 in)
If the clearance is greater than the maximum, replace camshaft
and/or cylinder head.
Maximum clearance:
0.045 - 0.086 mm (0.0018 - 0.0034 in)
CAMSHAFT RUNOUT
Camshaft runout [TIR (Total Indicator Reading)]:
Limit 0.02 mm (0.0008 in)
If beyond the limit, replace.
CAMSHAFT CAM HEIGHT
Standard cam height:
Intake
48.005 - 48.195 mm (1.8900 - 1.8974 in)
Exhaust
49.505 - 49.695 mm (1.9490 - 1.9565 in)
Cam wear:
Limit 0.15 mm (0.0059 in)
If wear is beyond the limit, replace.
SEM726B
SEM727B
SEM728B
SEM729B
SEM730B
CYLINDER HEAD
Inspection (Cont'd)
EM-37

Assembly
1. Install valve component parts.
Install valve spring with its narrow pitch side toward cylinder
head side.
a. When installing valve, apply engine oil on the valve stem
and lip of valve oil seal.
b. Check whether the valve face is free from foreign matter.
c. Install valve spring retainers on the intake side and valve
rotators on the exhaust side.
d. Valve rotators cannot be disassembled.
2. Set camshaft.
Set camshaft so that dowel pin faces up.
3. Install cam bracket caps so that front mark faces forward.
Cam bracket nut (Tighten in two or three stages):
:21-26Nzm
(2.1 - 2.7 kg-m, 15 - 20 ft-lb)
4. Apply engine oil to new oil seal and install it.
Installation
1. Install cylinder head gasket.
a. When replacing only cylinder head gasket, install same
grade gasket as the one formerly used.
b. When replacing or repairing cylinder block, cylinder head,
piston, connecting rod and crankshaft, select gasket as
follows:
SEM202
SEM731BB
SEM732B
SEM733B
CYLINDER HEAD
EM-38

Step 1:
Measure piston projection.
1) Set dial gauge on cylinder block surface to zero.
2) Set dial gauge at measuring point of piston, being careful not
to disturb its zero setting.
3) Set each piston at its Top Dead Center. With piston held in that
position, measure its projections at four points, M1, M2, M3 and
M4, and record measured values.
Be sure to measure the projection at four points for every cyl-
inder as shown.
Step 2:
Calculate the average value of measured projections for each cyl-
inder.
Step 3:
Calculate the average value of projections for all pistons.
Step 4:
Round off the average value.
Step 5:
Determine the gasket thickness, referring to chart A.
Relation between piston projection and cylinder head gasket
(Chart A)
Unit: mm (in)
GradeAverage values
piston projectionsGasket thicknessNumber of
identi®cations
ALess than
0.79 (0.0311)1.42 0.05
(0.0559 0.0020)1
B0.79 - 0.875
(0.0311 - 0.0344)1.50 0.05
(0.0591 0.0020)2
CMore than
0.875 (0.0344)1.58 0.05
(0.0622 0.0020)3
Step 6:
Check to see if the average value of each projection in step 2 is
larger than the max. value of the standard projection (of selected
gasket) plus 0.08 mm (0.0031 in).
Step 7:
If it is, use gasket that is 1 grade thicker.
If it is not, use gasket that was selected in step 4.
SEM734B
SEM735B
SEM736B
CYLINDER HEAD
Installation (Cont'd)
EM-39

2. Install cylinder head.
(1) Make sure that No. 1 cylinder is at Bottom Dead Center.
(2) Make sure that No. 1 cam of camshaft is at BDC on its expan-
sion stroke.
(3) Tighten cylinder head bolts to the speci®ed torque in the
sequence as follows:
+Tightening procedure.
M12 bolt
1st Tighten all bolts to 29 Nzm (3.0 kg-m, 22 ft-lb).
2nd Tighten all bolts to 113 Nzm (11.5 kg-m, 83 ft-lb).
3rd Loosen all bolts completely.
4th Tighten all bolts to 29 Nzm (3.0 kg-m, 22 ft-lb).
5th Tighten all bolts to 108 to 118 Nzm (11 to 12 kg-m, 80 to
87 ft-lb) or if you have an angle wrench, turn all bolts 89
to 92 degrees clockwise.
M8 bolt
16-21Nzm (1.6 - 2.1 kg-m, 12 - 15 ft-lb)
3. Install front back cover and camshaft pulley.
Front back cover:
:3-5Nzm
(0.3 - 0.5 kg-m, 26 - 43 in-lb)
Camshaft pulley:
: 123 - 132 Nzm
(12.5 - 13.5 kg-m, 90 - 98 ft-lb)
4. Install timing belt. Refer to ``Replacing Timing Belt'' in section
MA.
5. Install rocker cover. Refer to EM-30.
Apply sealant to rocker cover gasket as shown.
Do not apply too much sealant.
6. Install intake and exhaust manifold. Refer to EM-30.
SEM732B
SEM737BA
SEM711B
SEM738B
CYLINDER HEAD
Installation (Cont'd)
EM-40

Checking
Check valve clearance while engine is warm and not running.
1. Remove rocker cover.
2. Set No. 1 cylinder at TDC on its compression stroke.
+Align pointer with TDC mark on crankshaft pulley.
+Check that valve lifters on No. 1 cylinder are loose and valve
lifters on No. 6 are tight.
If not, turn crankshaft one revolution (360É) and align as
described above.
3. Check only those valves shown in the ®gure.
No. 1 No. 2 No. 3 No. 4 No. 5 No. 6
INT EXH INT EXH INT EXH INT EXH INT EXH INT EXH
No. 1 cylin-
der at TDCjjj jj j
+Using a feeler gauge, measure clearance between valve lifter
and camshaft.
+Record any valve clearance measurements which are out of
speci®cation. They will be used later to determine the required
replacement adjusting shim.
Valve clearance for checking (Hot):
Intake
0.28 - 0.38 mm (0.011 - 0.015 in)
Exhaust
0.32 - 0.42 mm (0.013 - 0.017 in)
4. Turn crankshaft one revolution (360É) and align mark on crank-
shaft pulley with pointer.
5. Check only those valves shown in the ®gure.
No. 1 No. 2 No. 3 No. 4 No. 5 No. 6
INT EXH INT EXH INT EXH INT EXH INT EXH INT EXH
No. 6 cylin-
der at TDCjj jj jj
+Use the same procedure as mentioned in step 4.
6. If all valve clearances are within speci®cation, install the follow-
ing parts:
+Rocker cover
SEM790F
SEM799F
SEM634F
SEM800F
VALVE CLEARANCE
EM-41

Adjusting
Adjust valve clearance while engine is cold.
1. Turn crankshaft. Position cam lobe upward on camshaft for
valve that must be adjusted.
2. Place Tool (A) around camshaft as shown in ®gure.
Before placing Tool (A), rotate notch toward center of cylinder
head. (See ®gure.) This will simplify shim removal later.
CAUTION:
Be careful not to damage cam surface with Tool (A).
3. Rotate Tool (A) (See ®gure.) so that valve lifter is pushed down.
4. Place Tool (B) between camshaft and valve lifter to retain valve
lifter.
CAUTION:
+Tool (B) must be placed as close to camshaft bracket as
possible.
+Be careful not to damage cam surface with Tool (B).
5. Remove Tool (A).
6. Remove adjusting shim using a small screwdriver and a mag-
netic ®nger.
7. Determine replacement adjusting shim size using the following
formula.
+Use a micrometer to determine thickness of removed shim.
+Calculate thickness of new adjusting shim so valve clearance
comes within speci®ed values.
R = Thickness of removed shim
N = Thickness of new shim
M = Measured valve clearance
S = Standard valve clearance
Unit: mm (in)
HOTIntake 0.28 - 0.38 (0.0110 - 0.0150)
Exhaust 0.32 - 0.42 (0.0126 - 0.0165)
COLDIntake 0.26 - 0.34 (0.0102 - 0.0134)
Exhaust 0.30 - 0.38 (0.0118 - 0.0150)
Intake:
N=R+[MþS]
Exhaust:
N=R+[MþS]
Shims are available in 15 sizes from 2.20 mm (0.0866 in) to 2.90
mm (0.1142 in), in steps of 0.05 mm (0.0020 in).
SEM636F
SEM637F
SEM638F
SEM145D
VALVE CLEARANCE
EM-42

+Select the closest size shim to the calculated thickness. Refer
to chart in SDS, EM-60.
8. Install new shim using a suitable tool.
+Install with the surface on which the thickness is stamped
facing down.
9. Place Tool (A) as explained in steps 2 and 3.
10. Remove Tool (B).
11. Remove Tool (A).
12. Recheck valve clearance.
Valve clearance:
Unit: mm (in)
For adjusting
Hot Cold* (reference data)
Intake0.28 - 0.38
(0.011 - 0.015)0.26 - 0.34
(0.010 - 0.013)
Exhaust0.32 - 0.42
(0.013 - 0.017)0.30 - 0.38
(0.012 - 0.015)
*: At a temperature of approximately 20ÉC (68ÉF)
Whenever valve clearances are adjusted to cold speci®cations, check that
the clearances satisfy hot speci®cations and adjust again if necessary.
AEM236
VALVE CLEARANCE
Adjusting (Cont'd)
EM-43

SEM433C
ENGINE REMOVAL
EM-44