1998 NISSAN PICK-UP engine

Lubrication Circuit
DLC014
ENGINE LUBRICATION SYSTEMTD
LC-12

Oil Pressure Check (On-vehicle service)
WARNING:
lBe careful not to burn yourself, as the engine and oil
may be hot.
lOil pressure check should be done in ``Neutral'' gear
position.
1. Check oil level.
2. Disconnect oil pressure switch harness connector.
3. Remove oil pressure switch.
4. Install pressure gauge and hose.
5. Start engine and warm it up to normal operating temperature.
6. Check oil pressure with engine running under no-load.
Engine speed
rpmApproximate discharge pressure
kPa (bar, kg/cm2, psi)
Idle speed More than 78 (0.78, 0.8, 11)
3,000294 - 392
(2.94 - 3.92, 3.0 - 4.0, 43 - 57)
If difference is extreme, check oil passage and oil pump for
oil leaks.
7. Install oil pressure switch with sealant.
Oil pressure switch:
:10-13Nzm (1.0 - 1.3 kg-m, 87 - 113 in-lb)
DLC013
DLC002
ENGINE LUBRICATION SYSTEMTD
LC-13

Oil Pump
OIL PUMP INSPECTION
1. Inspect pump body, gears and drive shaft for wear and dam-
age.
2. Using a feeler gauge and fuse wire, check the following
clearances.
Gear side clearance:
Less than 0.13 mm (0.0051 in)
Gear backlash:
Less than 0.43 mm (0.0169 in)
3. Measure inside diameter ``A'' of bushing.
A: 13.012 - 13.106 mm (0.5123 - 0.5160 in)
SLC020AB
SLC966
SLC967
SLC968
ENGINE LUBRICATION SYSTEMTD
LC-14

4. Measure outside diameter ``B'' of drive gear shaft.
B: 12.974 - 12.992 mm (0.5108 - 0.5115 in)
5. Calculate oil pump bushing clearance.
Oil pump bushing clearance:AþB
Less than 0.15 mm (0.0059 in)
If it exceeds the limit, replace oil pump bushing or entire oil
pump assembly.
For installing timing gear case, refer to EM section (``TIMING
GEAR CASE'', ``Assembly'', ``ENGINE OVERHAUL'').
MLC089A
SLC965-B
ENGINE LUBRICATION SYSTEMTD
Oil Pump (Cont'd)
LC-15

Oil Filter Bracket
OIL PUMP RELIEF VALVE INSPECTION
1. Visually inspect components for wear and damage.
2. Coat relief valve with engine oil and check that it falls
smoothly into the valve hole by its own weight.
If damaged, replace oil pump relief valve set.
OIL FILTER RELIEF VALVE INSPECTION
Inspect oil filter relief valve for rough movement and damage by
pushing the ball.
If damaged, replace oil filter bracket assembly.
DLC003
ENGINE LUBRICATION SYSTEMTD
LC-16

Oil Cooler
OIL COOLER RELIEF VALVE INSPECTION
Inspect oil cooler relief valve for movement, cracks and breaks
by pushing the ball.
If damaged, replace oil cooler relief valve set.
REGULATOR VALVE INSPECTION
1. Visually inspect components for wear and damage.
2. Coat regulator valve with engine oil and check that it falls
smoothly into the valve hole by its own weight.
If damaged, replace regulator valve set.
SLC141B
ENGINE LUBRICATION SYSTEMTD
LC-17

Oil Jet
INSPECTION (For gear train)
Make sure that the holes are not clogged. Clean them with a wire
if necessary.
Oil jet has to be installed with oil hole facing crank gear and
idler gear.
INSPECTION (For piston)
1. Push cut-off valve of oil jet bolt with a clean resin or brass
rod and make sure that cut-off valve moves smoothly with
proper repulsion.
2. Make sure that the oil jet passage is not clogged. Clean with
a wire if necessary.
When installing oil jet, align oil jet's boss with hole on cyl-
inder block.
Oil jet bolt:
:29-39Nzm (3.0 - 4.0 kg-m, 22 - 29 ft-lb)
TD25
Dimension ``D''
mm (in)Type I Ð
Type II 12 (0.47)
Identification color Ð
DLC004
SLC015
SLC875A
DLC005
ENGINE LUBRICATION SYSTEMTD
LC-18

Cooling Circuit
DLC006
ENGINE COOLING SYSTEMTD
LC-19