2000 NISSAN PATROL Electronic Repair Manual

Removal and Installation
2 idler gears are shown in this chapter. Idler gear (A) has scissors gear, and idler gear (B) does not.
SEM314GA
TIMING GEARZD
EM-1039

Removal
1. Remove the following parts.
+Undercover
+Engine oil (Drain)
+Engine coolant (Drain)
+Engine cover
+Intercooler
+Air inlet pipe
+Air cleaner case
+Throttle body
+Swirl and intake air control valve control solenoid valve and
bracket
+Vacuum tank
+Glow plate
+Rocker cover
+Spill tube
+Radiator shrouds (Rear and Lower)
+Cooling fan
+Radiator hose (Upper and Lower)
+Auxiliary belt and auto tensioner.
2. Remove the alternator.
3. Remove the A/C compressor and bracket with piping con-
nected. Move and support it at the LH side of engine bay with
a rope to avoid putting load on piping.
Refer to HA section in Nissan Service Manual (Supplement
I: Publication No. SM0E-Y61AE0E.)
4. Remove the chain cover, timing chain and other parts in
connection.
Before removing timing chain, remove injection pump
sprocket with No.1 cylinder being positioned at TDC. Refer
to the figure.
Refer to ªTIMING CHAINº, EM-1027.
CAUTION:
After removing timing chain, never rotate crankshaft, or the
piston will push the valve up and damage the valve.
+Do not paint the match mark on the timing chain beforehand
as the No. 1 cylinder is set at the TDC during assembly.
5. Remove the TDC sensor.
CAUTION:
+Do not drop or hit the sensor.
+Store in a clean place free of iron filings, etc.
+Do not place near any magnetic equipment.
6. Remove the water pump and its stud bolts.
Refer to ªWATER PUMPº in LC section.
7. Remove the water inlet.
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TIMING GEARZD
EM-1040

8. Remove the crankshaft pulley.
+To fix the crankshaft, remove the starter motor and set ring
gear stopper (SST).
CAUTION:
+Do not damage or magnetize the signal detection protru-
sions of the crankshaft pulley.
+After removing timing chain, never rotate crankshaft, or
the piston will push the valve up and damage the valve.
9. Remove the gear case.
+Using the grooved places shown in the figure, remove the
gear case by using a screwdriver and a seal cutter (SST).
10. Remove the front oil seal from the gear case by using a
screwdriver.
CAUTION:
Do not damage the gear case.
11. Fix the internal mechanism setting bolt [part No.: 81-20620-
28, screw dia.: M6, dimension below neck: 20 mm (0.79 in)]
to the bolt hole of the idler gear (A) and tighten to the speci-
fication.
: 2.5 - 3.4 Nzm (0.25 - 0.35 kg-m, 22 - 30 in-lb)
CAUTION:
+Only use the genuine setting bolt, or the idler gear (A)
will be damaged.
+Do not rotate the crankshaft as the head of the setting
bolts interferes with the gear case.
+Do not remove the setting bolt from the idler gear (A)
until the timing chain and all of the parts in connection
have been installed.
+If these bolts are not installed, internal mechanism will
disengage after the idler gear is removed. This will pro-
hibit the idler gear from being reusable.
FEM051
FEM052
SEM377G
TIMING GEARZD
Removal (Cont'd)
EM-1041

12. Remove the idler gears (A) and (B).
+Check the backlash of each gear before removing. Refer to
ªBACKLASH OF EACH GEARº, ªInspectionº.
CAUTION:
+Do not loosen the internal mechanism setting bolt of the
idler gear (A). (The idler gear cannot be reused when the
internal mechanism is released.)
+During removal of the idler gears (A) and (B), do not face
the rear side downward as the idler shaft will drop.
13. Set the fuel injection timing gear with the pulley holder (SST).
14. Remove injection pump timing gear.
15. Extract the balancer shaft taking care not to damage the
inner bushes of the cylinder block.
16. Remove the fuel injection pump.
17. Remove the front plate.
Inspection
BACKLASH OF EACH GEAR
Method using a fuse wire
+Tighten the holding bolts of each gear to specification.
+Place a wire in the biting area of the teeth between the gears
to be checked, rotate the crankshaft in the operating direc-
tion so that the wire is taken inwards.
+Measure the crushed area of the wire with a micrometer.
Method using dial gauge
+Tighten the holding bolts of each gear to specification.
+Place the dial gauge on the tooth surface area of the gear to
be checked.
+With the other gear in a set position, measure the dial gauge
value while moving the gear left and right.
Standard: 0.07 - 0.11 mm (0.0028 - 0.0043 in)
Limit: 0.20 mm (0.0079 in)
+If it exceeds the limit, replace the gear and measure again.
+
If it exceeds the limit again, check for the installation condition of
the gear driving parts, wear of shaft and gear, and oil clearance.
SEM348G
SEM378G
SEM352G
FEM035
FEM036
TIMING GEARZD
Removal (Cont'd)
EM-1042

IDLER GEAR END PLAY
+Tighten the holding bolts to the specification.
+Measure the clearance between the gear plate and idler gear
using a feeler gauge.
Unit: mm (in)
Standard Limit
Idler gear (A)
0.06 - 0.12
(0.0024 - 0.0047)0.15 (0.0059)
Idler gear (B)
+If it exceeds the limit, replace the idler gear, shaft, and gear
plate.
IDLER GEAR OIL CLEARANCE
+Measure the inner diameter (d1) of the idler gear shaft.
Standard:
Idler gear (A)
43.000 - 43.020 mm (1.6929 - 1.6937 in) dia.
Idler gear (B)
28.600 - 28.620 mm (1.1260 - 1.1268 in) dia.
+Measure the outer diameter (d2) of the idler shaft.
Standard:
Idler gear (A)
42.959 - 42.975 mm (1.6913 - 1.6919 in) dia.
Idler gear (B)
28.567 - 28.580 mm (1.1247 - 1.1252 in) dia.
+Calculate the oil clearance.
Clearance = d1 þ d2
Unit: mm (in)
Standard Limit
Idler gear (A)0.025 - 0.061
(0.0010 - 0.0024)
0.2 (0.0079)
Idler gear (B)0.020 - 0.053
(0.0008 - 0.0021)
+If it exceeds the limit, refer to each standard specification and
replace the idler gear and/or shaft.
BALANCER SHAFT END PLAY
+Measure the clearance between the plate and gear using a
feeler gauge.
Standard: 0.07 - 0.22 mm (0.0028 - 0.0087 in)
+If it exceeds the specification, replace the balancer shaft
assembly.
+As the gears are press-fitted, there are no setting for indi-
vidual parts.
FEM037
FEM038
TIMING GEARZD
Inspection (Cont'd)
EM-1043

BALANCER SHAFT OIL CLEARANCE
Outer diameter of balancer shaft journal
Measure the outer diameter of the balancer shaft journal with a
micrometer.
Standard:
Front side
50.875 - 50.895 mm (2.0029 - 2.0037 in) dia.
Rear side
50.675 - 50.695 mm (1.9951 - 1.9959 in) dia.
Inner diameter of balancer shaft bearing
Measure the inner diameter of the balancer shaft bearing using
a bore gauge.
Standard:
Front side
50.940 - 51.010 mm (2.0055 - 2.0083 in) dia.
Rear side
50.740 - 50.810 mm (1.9976 - 2.0004 in) dia.
Oil clearance calculations
Oil clearance = Bearing inner diameter þ Journal outer diameter
Standard: 0.045 - 0.135 mm (0.0018 - 0.0053 in)
Limit: 0.180 mm (0.0071 in)
BALANCER SHAFT BEARING REMOVAL AND
INSTALLATION
1. Remove balancer shaft front bearing.
FEM039
FEM040
SEM993BA
SEM380G
TIMING GEARZD
Inspection (Cont'd)
EM-1044

2. Using Tool, remove balancer shaft rear bearing from engine.
3. Install the rear and front balancer shaft bearings.
+Install from the cylinder block hole to the rear journal and
then the front journal.
+Install the groove of the balancer shaft bearing facing the
front and the under right direction.
(Align the guide plate and bar knock pin and then force in the
balancer shaft bearing.)
+Align the balancer shaft bearing groove with the knock pin of
the bar (SST) and install the balancer shaft bearing.)
+On rear journals, so the bearing does not get out of position,
wrap tape around the bar.
SEM381G
SEM382G
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EMV0514D
TIMING GEARZD
Inspection (Cont'd)
EM-1045

+Make an alignment mark 11.0 0.8 mm (0.433 0.031 in) from
the bar No. 2 engraved line with a marker pen. This align-
ment mark
VBwill be the point to where the rear bearing is
pushed.
+Insert the bar with the bearing installed into the cylinder block
and install the guide plate (SST).
+Align the guide plate with the ZD engraving and install the
bolts.
CAUTION:
Use a washer of the same thickness used on the front plate
to prevent the guide plate from bending.
+Push the engraved bar alignment mark
VBto the same posi-
tion of the guide plate tip
VA.
+After all the journals have been installed, make sure that all
the journal and cylinder block oil holes are aligned.
4. Install the front balancer shaft bearing.
+Align the journal and cylinder block oil holes.
+Use a drift (SST) to force in the tip of the journal to 8.0 0.3
mm (0.315 0.012 in) inside the cylinder block.
+After installing the journal, make sure that the journal and
cylinder block oil holes are aligned.
SEM385G
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TIMING GEARZD
Inspection (Cont'd)
EM-1046