2002 NISSAN TERRANO Service Repair Manual

8. Remove the adjusting shim by using a magnetic hand.
9. Measure the thickness of the adjusting shim using a microme-
ter.
IMeasure 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)
INew 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)
IThe 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-37

Removal and Installation
2 idler gears are shown in this chapter. Idler gear (A) has scissors gear, and idler gear (B) does not.
YEM029
TIMING GEARZD
EM-38

Removal
1. Remove the engine assembly.
Refer to ªENGINE REMOVALº, EM-63.
2. Place the engine on an engine stand (SST).
Refer to ªCYLINDER BLOCKº, EM-67.
3. Remove the following.
IAuto tensioner bracket
IAir conditioner bracket
IAlternator bracket
IOil tube
IVacuum pump
IRocker cover
IOil pan (upper, lower)
IInjection tube
ISpill tube
IHigh pressure nozzle assembly
4. Remove the chain cover, timing chain and other parts in con-
nection.
Before removing timing chain, remove injection pump sprocket
with No. 1 cylinder being positioned at TDC. Refer to the fig-
ure. Refer to ªTIMING CHAINº, EM-26.
CAUTION:
After removing timing chain, never rotate crankshaft, or the
piston will push the valve up and damage the valve.
IDo 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:
IDo not drop or hit the sensor.
IStore in a clean place free of iron filings, etc.
IDo not place near any magnetic equipment.
6. Remove the water pump.
Refer to ªWATER PUMPº in LC section.
7. Remove the water inlet.
SEM376G
TIMING GEARZD
EM-39

8. Remove the crankshaft pulley.
ITo fix the crankshaft, clamp the bar between the drive plate
holding bolts, and set by touching the engine sub-attachment
(SST).
IAs another method, set by clamping a hammer handle, etc. in
the counterweight portion of the crankshaft.
CAUTION:
IDo not damage the crankshaft.
IMake sure that no foreign objects get inside the engine.
IDo not damage or magnetize the signal detection protru-
sions of the crankshaft pulley.
IAfter removing timing chain, never rotate crankshaft, or
the piston will push the valve up and damage the valve.
9. Remove the gear case.
IUsing 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 screw-
driver.
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 specification.
: 2.5 - 3.4 N×m (0.25 - 0.35 kg-m, 22 - 30 in-lb)
CAUTION:
IOnly use the genuine setting bolt, or the idler gear (A) will
be damaged.
IDo not rotate the crankshaft as the head of the setting
bolts interferes with the gear case.
IDo not remove the setting bolt from the idler gear (A) until
the timing chain and all of the parts in connection have
been installed.
IIf these bolts are not installed, internal mechanism will
disengage after the idler gear is removed. This will prohibit
the idler gear from being reusable.
FEM050
YEM030
FEM052
SEM377G
TIMING GEARZD
Removal (Cont'd)
EM-40

12. Remove the idler gears (A) and (B).
ICheck the backlash of each gear before removing. Refer to
ªBACKLASH OF EACH GEARº, ªInspectionº.
CAUTION:
IDo not loosen the internal mechanism setting bolt of the
idler gear (A). (The idler gear cannot be reused when the
internal mechanism is released.)
IDuring 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
ITighten the holding bolts of each gear to specification.
IPlace a wire in the biting area of the teeth between the gears
to be checked, rotate the crankshaft in the operating direction
so that the wire is taken inwards.
IMeasure the crushed area of the wire with a micrometer.
Method using dial gauge
ITighten the holding bolts of each gear to specification.
IPlace the dial gauge on the tooth surface area of the gear to
be checked.
IWith 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)
IIf it exceeds the limit, replace the gear and measure again.
IIf it exceeds the limit again, check for the installation condition
of the gear driving parts, wear of shaft and gear, and oil clear-
ance.
SEM348G
SEM378G
SEM352G
FEM035
FEM036
TIMING GEARZD
Removal (Cont'd)
EM-41

IDLER GEAR END PLAY
ITighten the holding bolts to the specification.
IMeasure 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)
IIf it exceeds the limit, replace the idler gear, shaft, and gear
plate.
IDLER GEAR OIL CLEARANCE
IMeasure 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.
IMeasure 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.
ICalculate 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)
IIf it exceeds the limit, refer to each standard specification and
replace the idler gear and/or shaft.
BALANCER SHAFT END PLAY
IMeasure the clearance between the plate and gear using a
feeler gauge.
Standard: 0.07 - 0.22 mm (0.0028 - 0.0087 in)
IIf it exceeds the specification, replace the balancer shaft
assembly.
IAs the gears are press-fitted, there are no setting for individual
parts.
FEM037
FEM038
TIMING GEARZD
Inspection (Cont'd)
EM-42

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-43

2. Using Tool, remove balancer shaft rear bearing from engine.
3. Install the rear and front balancer shaft bearings.
IInstall from the cylinder block hole to the rear journal and then
the front journal.
IInstall 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.)
IAlign the balancer shaft bearing groove with the knock pin of
the bar (SST) and install the balancer shaft bearing.)
IOn rear journals, so the bearing does not get out of position,
wrap tape around the bar.
SEM381G
SEM382G
SEM383G
EMV0514D
TIMING GEARZD
Inspection (Cont'd)
EM-44