2000 NISSAN PATROL Electronic Repair Manual

Removal and 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 cams, in this chapter
they are named as follows:
Camshaft (Right side): Intake manifold side camshaft
Camshaft (Left side): Exhaust manifold side camshaft
+The same parts are used for the right and left sides.
+Refer to the figure for intake and exhaust valve arrangement.
(The camshafts have, alternately, either an intake valve or an
exhaust valve.)
Removal
1. Set the No. 1 cylinder at TDC, then remove the chain case,
timing chain and other parts in connection. Refer to ªTIMING
CHAINº, EM-1027.
2. Remove the cam gear.
+Loosen the cam gear installation bolt by fixing the hexago-
nal portion of the camshaft.
+The idler gear cannot be removed at this point as the gear
case is in the way. (The cylinder head can be removed as a
single unit.)
SEM350G
FEM010
FEM011
CAMSHAFTZD
EM-1031

3. Remove injection tube and injection nozzle assembly. Refer
to EC section, ªInjection Tube and Injection Nozzleº in
ªBASIC SERVICE PROCEDUREº.
4. 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.
5. 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
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 jour-
nals No. 1 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.
Camshaft bend value is 1/2 of needle movement.
Limit: 0.02 mm (0.0008 in)
HEIGHT OF CAM NOSE
Measure by using a micrometer.
Standard:
Intake
40.488 0.02 mm (1.5940 0.0008 in)
Exhaust
40.850 0.02 mm (1.6083 0.0008 in)
CAMSHAFT OIL CLEARANCE
Measure by using a micrometer.
Cam journal outer diameter:
Standard
29.931 - 29.955 mm (1.1784 - 1.1793 in) dia.
FEM012
FEM013
FEM014
FEM015
CAMSHAFTZD
Removal (Cont'd)
EM-1032

CAMSHAFT BRACKET INNER DIAMETER
+Install camshaft bracket and tighten bolts to the specified
torque.
+Measure inner diameter of camshaft bracket using an inside
micrometer.
Standard: 30.000 - 30.021 mm (1.1811 - 1.1819 in) dia.
CAMSHAFT OIL CLEARANCE CALCULATIONS
Oil clearance = Cam bracket inner diameter þ Cam journal outer
diameter
Standard: 0.045 - 0.090 mm (0.0018 - 0.0035 in) dia.
+If it exceeds the standard value, refer to the standard value
of each unit, then replace the camshaft and/or cylinder head.
+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.
Standard: 0.065 - 0.169 mm (0.0026 - 0.0067 in)
Limit: 0.2 mm (0.0079 in)
+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.
VISUAL INSPECTION OF VALVE LIFTER
Check lifter side for any signs of wear or damage. Replace if
there are any abnormalities.
VISUAL INSPECTION OF ADJUSTING SHIM
Check cam nose contact and sliding surfaces for wear and
scratches. Replace if there are any abnormalities.
VALVE LIFTER CLEARANCE
Measure the outer diameter of the valve lifter with a micrometer.
Standard: 34.450 - 34.465 mm (1.3563 - 1.3569 in) dia.
FEM016
FEM017
FEM018
CAMSHAFTZD
Inspection (Cont'd)
EM-1033

VALVE LIFTER BORE DIAMETER
Measure the bore diameter of the cylinder head valve lifter with
an inside micrometer.
Standard: 34.495 - 34.515 mm (1.3581 - 1.3589 in) dia.
VALVE LIFTER CLEARANCE CALCULATIONS
Clearance = Valve lifter bore diameter þ Valve lifter outer diam-
eter
Standard: 0.030 - 0.065 mm (0.0012 - 0.0026 in)
If it exceeds the standard value, refer to the outer diameter and
bore diameter standard values and replace valve lifter and/or
cylinder head.
Installation
1. Install the valve lifter and adjusting shim.
+Make sure that these are installed in the same position as
before the removal process.
2. Install the camshaft.
+Follow the distinguishing marks that were placed on in the
removal process.
+Face the key in the direction shown in the figure.
3. Install the camshaft bracket.
+Refer to the camshaft bracket upper side journal No. and
install.
+Looking from the exhaust manifold side (left side of engine),
install in the direction that the journal number can be read
correctly.
+Place baffle plate onto upper face of No. 1 camshaft bracket,
and tighten together.
4. Tighten the installation bolts in numerical order in the figure.
1) Tighten to 10 to 14 Nzm (1.0 to 1.5 kg-m, 8 to 10 ft-lb).
+Make sure that the thrust portion of the camshaft is fitted
properly in the head installation side.
2) Tighten to 20 to 23 Nzm (2.0 to 2.4 kg-m, 15 to 17 ft-lb).
FEM019
FEM020
FEM021
FEM012
CAMSHAFTZD
Inspection (Cont'd)
EM-1034

5. Install the cam gear.
+Align the match marks, and install the idler gear and each
cam gear to the position shown in the figure.
+Tighten the cam gear installation bolt by fixing the hexago-
nal portion of the camshaft.
6. Install the timing chain, all other related parts and chain
cover.
Refer to ªTIMING CHAINº, EM-1027.
7. After installing the timing chain, check and adjust the valve
clearance before installing the spill tube.
Refer to ªVALVE CLEARANCEº, EM-1036.
8. Install in the reverse order of removal.
FEM023
CAMSHAFTZD
Installation (Cont'd)
EM-1035

Inspection
+When the camshaft or parts in connection with valves are
removed or replaced, and a fault has occurred (poor starting,
idling, or other faults) due to the misadjustment of the valve
clearance, inspect as follows.
+Inspect and adjust when the engine is cool (at normal tem-
perature).
+Be careful of the intake and exhaust valve arrangement. (The
valve arrangement is different from that in a normal engine.)
(The camshafts have, alternately, either an intake valve or an
exhaust valve.)
1. Remove the following parts.
+Intercooler cover
+Intercooler
+Rocker cover
2. Set the No. 1 cylinder at TDC.
1) Rotate the crankshaft pulley clockwise, and align the TDC
mark of the crankshaft pulley with the timing indicator of the
TDC sensor bracket.
2) Confirm that the cam nose of the No. 1 cylinder and the
knock pin of the cam sprocket is in the position shown in the
figure.
+Rotate the crankshaft pulley again if not in the position shown
in the figure.
3. While referring to the figure, measure the valve clearance in
the circled area of the table below.
Measuring pointNo. 1 No. 2 No. 3 No. 4
INT EXH INT EXH INT EXH INT EXH
When the No. 1
cylinder is in the
TDCjjj j
+The injection order is 1-3-4-2.
+Measure the valve clearance using a JIS high grade feeler
gauge when the engine is cool (at normal temperature).
Standard:
Intake and exhaust
0.35 0.05 mm (0.0138 0.0020 in)
4. Set the No. 4 cylinder at TDC by rotating the crankshaft
clockwise once.
FEM010
SEM342G
FEM024
FEM025
FEM026
VALVE CLEARANCE INSPECTIONS AND ADJUSTMENTSZD
EM-1036

5. While referring to the figure, measure the valve clearance in
the circled area of the table below.
Measuring pointNo. 1 No. 2 No. 3 No. 4
INT EXH INT EXH INT EXH INT EXH
When the No. 4
cylinder is in the
TDCjj jj
6. If the valve clearance is outside the specification, adjust as
follows.
Adjustments
+Remove the adjusting shim for parts which are outside the
specified valve clearance.
1. Remove the spill tube.
2. Extract the engine oil on the upper side of the cylinder head
(for the air gun used in step 7).
3. Rotate the crankshaft to face the cam for adjusting shims that
are to be removed upward.
4. Grip the camshaft with camshaft pliers (SST), the using the
camshaft as a support point, push the adjusting shim down-
ward to compress the valve spring.
CAUTION:
Do not damage the camshaft, cylinder head, or the outer
circumference of the valve lifter.
5. With the valve spring in a compressed state, remove the
camshaft pliers (SST) by securely setting the outer circum-
ference of the valve lifter with the end of the lifter stopper
(SST).
+Hold the lifter stopper by hand until the shim is removed.
CAUTION:
Do not retrieve the camshaft pliers forcefully, as the cam-
shaft will be damaged.
6. Move the rounded hole of the adjusting shim to the front with
a very thin screwdriver.
+When the adjusting shim on the valve lifter will not rotate
smoothly, restart from step 4 with the end of the lifter stop-
per (SST) touching the adjusting shim.
7. Remove the adjusting shim from the valve lifter by blowing
air through the rounded hole of the shim with an air gun.
CAUTION:
To prevent any remaining oil from being blown around, thor-
oughly wipe the area clean and wear protective goggles.
FEM027
FEM028
FEM029
FEM030
VALVE CLEARANCE INSPECTIONS AND ADJUSTMENTSZD
Inspection (Cont'd)
EM-1037

8. Remove the adjusting shim by using a magnetic hand.
9. Measure the thickness of the adjusting shim using a
micrometer.
+Measure near the center of the shim (the part that touches
the cam).
10. Select the new adjusting shim from the following methods.
Calculation method of the adjusting shim thickness:
t=t
1+(C1þC2)
t = Adjusting shim thickness
t
1= Thickness of the removed shim
C
1= Measured valve clearance
C
2= Specified valve clearance
[when the engine is cool (at normal temperature)]
0.35 mm (0.0138 in)
+New adjusting shims have the thickness stamped on the rear
side.
Stamped Shim thickness mm (in)
2.35
2.40
.
.
.
3.052.35 (0.0925)
2.40 (0.0945)
.
.
.
3.05 (0.1201)
+The thickness of the adjusting shim ranges from 2.35 to 3.05
mm (0.0925 to 0.1201 in), where in the space of 0.05 mm
(0.0020 in). There are 15 types of shims available.
11. Fix the selected adjusting shim to the valve lifter.
CAUTION:
Place the stamped side of the adjusting shim to the valve
lifter.
12. Compress the valve spring using the camshaft pliers and
remove the lifter stopper (SST).
13. Rotate the crankshaft 2 to 3 times by hand.
14. Confirm that the valve clearance is within the specification.
FEM031
FEM032
FEM033
VALVE CLEARANCE INSPECTIONS AND ADJUSTMENTSZD
Adjustments (Cont'd)
EM-1038