1998 NISSAN PICK-UP adding oil

Service Notice
lWhen removing or installing various parts, place a cloth or padding onto the vehicle body to prevent
scratches.
lHandle trim, molding, instruments, grille, etc. carefully during removing or installing. Be careful not to soil
or damage them.
lApply sealing compound where necessary when installing parts.
lWhen applying sealing compound, be careful that the sealing compound does not protrude from parts.
lWhen replacing any metal parts (for example body outer panel, members, etc.), be sure to take rust
prevention measures.
Supplemental Restraint System (SRS) ``AIR
BAG'' (4WD models)
The Supplemental Restraint System ``AIR BAG'', used along with a seat belt, helps to reduce the risk or
severity of injury to the driver in a frontal collision. The Supplemental Restraint System consists of air bag
module (located in the center of the steering wheel), a diagnosis sensor unit, warning lamp, wiring harness
and spiral cable. Information necessary to service the system safely is included in theRS sectionof this
Service Manual.
WARNING:
lTo avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN dealer.
lImproper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system.
lDo not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses are covered with yellow insulation either just before the
harness connectors or for the complete harness, for easy identification.
Supplemental Restraint System (SRS) ``AIR
BAG'' (2WD models)
The Supplemental Restraint System ``AIR BAG'', used along with a seat belt, helps to reduce the risk or
severity of injury to the driver in a frontal collision. The Supplemental Restraint System consists of air bag
module (located in the center of the steering wheel), diagnosis sensor unit, warning lamp, wiring harness
and spiral cable. Information necessary to service the system safely is included in theRS sectionof this
Service Manual.
WARNING:
lTo avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN dealer.
lImproper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system.
lDo not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual.
PRECAUTIONS
BT-1

Body Front End
lWhen removing or installing hood, place a cloth or other padding on hood. This prevents vehicle body
from being scratched.
lBumper fascia is made of plastic. Do not use excessive force and be sure to keep oil away from it.
lHood adjustment: Adjust at hinge portion.
lHood lock adjustment: After adjusting, check hood lock control operation. Apply a coat of grease to hood
locks engaging mechanism.
lHood opener: Do not attempt to bend cable forcibly. Doing so increases effort required to unlock hood.
REMOVAL Ð Front bumper assembly
V1Remove screws securing left and right combination lamps and remove the lamps.
V2Remove clips securing front grille and remove the front grille.
V3Remove bolts securing left and right bumper stays.
V4Remove bolts securing left and right bumper side brackets.
V5Remove bolts securing left and right bumper side stays.
V6Extract bumper assembly.
BODY END
BT-5

Measurement of Compression Pressure
1. Warm up engine.
2. Turn ignition switch OFF.
3. Release fuel pressure.
Refer to EC section (``Fuel Pressure Release'', ``BASIC SER-
VICE PROCEDURE'').
4. Remove all spark plugs.
5. Disconnect distributor center cable.
6. Attach a compression tester to No. 1 cylinder.
7. Depress accelerator pedal fully to keep throttle valve wide
open.
8. Crank engine and record highest gauge indication.
9. Repeat the measurement on each cylinder.
lAlways use a fully-charged battery to obtain specified
engine speed.
Compression pressure:
kPa (bar, kg/cm
2, psi)/rpm
Standard
1,324 (13.24, 13.5, 192)/300
Minimum
981 (9.8, 10, 142)/300
Difference limit between cylinders
98 (0.98, 1.0, 14)/300
10. If compression in one or more cylinders is low:
a. Pour a small amount of engine oil into cylinders through
spark plug holes.
b. Retest compression.
lIf adding oil helps compression, piston rings may be
worn or damaged. If so, replace piston rings after check-
ing piston.
lIf pressure stays low, a valve may be sticking or seating
improperly. Inspect and repair valve and valve seat.
(Refer to SDS.) If valve or valve seat is damaged
excessively, replace them.
lIf compression stays low in two cylinders that are next
to each other:
a. The cylinder head gasket may be leaking, or
b. Both cylinders may have valve component damage.
Inspect and repair as necessary.
SEM113B
COMPRESSION PRESSUREKA
EM-10

Measurement of Compression Pressure
1. Warm up engine.
2. Stop engine. Remove glow plate and glow plugs.
3. Fit compression gauge adapter to cylinder head.
Compression gauge adapter:
:15-20Nzm (1.5 - 2.0 kg-m, 11 - 14 ft-lb)
4. Disconnect fuel cut solenoid wire connector.
5. Crank engine, then read gauge indication.
lEngine compression measurement should be made as
quickly as possible.
Compression pressure:
Unit: kPa (bar, kg/cm2, psi)/200 rpm
Standard 2,942 (29.4, 30, 427)
Minimum 2,452 (24.5, 25, 356)
Differential limit between cylinders 294 (2.9, 3, 43)
6. If cylinder compression in one or more cylinders is low, pour
a small quantity of engine oil into cylinders through the glow
holes and retest compression.
lIf adding oil helps the compression pressure, chances
are that piston rings are worn or damaged.
lIf pressure stays low, valve may be sticking or seating
improperly.
lIf cylinder compression in any two adjacent cylinders is
low, and if adding oil does not help the compression,
there is leakage past the gasketed surface.
Oil and water in combustion chambers can result from
this problem.
DEM019.DEM019
DEM020
DEM058
COMPRESSION PRESSURETD
EM-51

Measurement of Compression Pressure
1. Warm up engine.
2. Turn ignition switch OFF.
3. Release fuel pressure.
Refer to EC section (``Fuel Pressure Release'', ``BASIC SER-
VICE PROCEDURE'').
4. Remove all spark plugs.
5. Disconnect distributor center cable.
6. Attach a compression tester to No. 1 cylinder.
7. Depress accelerator pedal fully to keep throttle valve wide
open.
8. Crank engine and record highest gauge indication.
9. Repeat the measurement on each cylinder.
lAlways use a fully-charged battery to obtain specified
engine speed.
Compression pressure:
kPa (bar, kg/cm
2, psi)/rpm
Standard
1,324 (13.24, 13.5, 192)/300
Minimum
981 (9.8, 10, 142)/300
Difference limit between cylinders
98 (0.98, 1.0, 14)/300
10. If compression in one or more cylinders is low:
a. Pour a small amount of engine oil into cylinders through
spark plug holes.
b. Retest compression.
lIf adding oil helps compression, piston rings may be
worn or damaged. If so, replace piston rings after check-
ing piston.
lIf pressure stays low, a valve may be sticking or seating
improperly. Inspect and repair valve and valve seat.
(Refer to SDS.) If valve or valve seat is damaged
excessively, replace them.
lIf compression stays low in two cylinders that are next
to each other:
a. The cylinder head gasket may be leaking, or
b. Both cylinders may have valve component damage.
Inspect and repair as necessary.
SEM113B
COMPRESSION PRESSUREKA
EM-10

Measurement of Compression Pressure
1. Warm up engine.
2. Stop engine. Remove glow plate and glow plugs.
3. Fit compression gauge adapter to cylinder head.
Compression gauge adapter:
:15-20Nzm (1.5 - 2.0 kg-m, 11 - 14 ft-lb)
4. Disconnect fuel cut solenoid wire connector.
5. Crank engine, then read gauge indication.
lEngine compression measurement should be made as
quickly as possible.
Compression pressure:
Unit: kPa (bar, kg/cm2, psi)/200 rpm
Standard 2,942 (29.4, 30, 427)
Minimum 2,452 (24.5, 25, 356)
Differential limit between cylinders 294 (2.9, 3, 43)
6. If cylinder compression in one or more cylinders is low, pour
a small quantity of engine oil into cylinders through the glow
holes and retest compression.
lIf adding oil helps the compression pressure, chances
are that piston rings are worn or damaged.
lIf pressure stays low, valve may be sticking or seating
improperly.
lIf cylinder compression in any two adjacent cylinders is
low, and if adding oil does not help the compression,
there is leakage past the gasketed surface.
Oil and water in combustion chambers can result from
this problem.
DEM019.DEM019
DEM020
DEM058
COMPRESSION PRESSURETD
EM-51