1998 NISSAN PICK-UP check engine

Checking Manifold Tightening Torque
Checking should be performed while engine is cold
[approximately 20ÉC (68ÉF)].
Manifold bolts and nuts:
Intake
: 13 - 19 N´m (1.3 - 1.9 kg-m,9-14ft-lb)
Exhaust
: 25 - 29 N´m (2.5 - 3.0 kg-m, 18 - 22 ft-lb)
Exhaust tube nuts:
: 41.2 - 48.0 N´m (4.2 - 4.9 kg-m, 30 - 35 ft-lb)
Adjusting Intake and Exhaust Valve
Clearance
Adjustment should be made while engine is warm but not
running.
1. Set No. 1 cylinder in top dead center on its compression
stroke, and adjust valve clearance
V1,V2,V3andV6.
2. Set No. 4 cylinder at top dead center on its compression
stroke, and adjust valve clearance
V4,V5,V7andV8.
Valve clearance:
Intake
V1,V3,V5andV7
0.30 - 0.40 mm (0.012 - 0.016 in)
Exhaust
V2,V4,V6andV8
0.30 - 0.40 mm (0.012 - 0.016 in)
Adjusting screw lock nuts:
: 15 - 20 N´m (1.5 - 2.0 kg-m, 11 - 14 ft-lb)
lTighten lock nuts, by fixing the adjusting screws using a
minus driver.
Checking Drive Belt
1. Inspect for cracks, fraying, wear or oil adhesion. Replace if
necessary.
The belts should not touch the bottom of the pulley groove.
2. Check drive belt deflection by pushing on the belt midway
between pulleys.
Adjust if belt deflections exceed the limit.
Unit: mm (in)
Used belt deflection
Deflection of new belt
LimitDeflection after
adjustment
Alternator 20 (0.79) 11 - 13 (0.43 - 0.51) 9 - 11 (0.35 - 0.43)
Air conditioner
compressor12 (0.47) 6 - 7.5 (0.236 - 0.295) 5 - 6.5 (0.197 - 0.256)
Power steering oil
pump15 (0.59) 8 - 9.5 (0.315 - 0.374) 7 - 8.5 (0.276 - 0.335)
Applied pushing
force98 N (10 kg, 22 lb)
Check drive belt deflections when engine is cold.
SMA653C
SMA613C
ENGINE MAINTENANCETD
MA-23

Changing Engine Oil
WARNING:
lBe careful not to burn yourself, as engine oil is hot.
lProlonged and repeated contact with used engine oil
may cause skin cancer; try to avoid direct skin contact
with used oil. If skin contact is made, wash thoroughly
with soap or hand cleaner as soon as possible.
1. Warm up engine, and check for oil leakage from engine com-
ponents.
2. Remove oil filler cap and drain plug.
3. Drain oil and fill with new engine oil.
Oil grade: API CC or CD except Europe
API, CD for Europe
Viscosity:
See ``RECOMMENDED FLUIDS AND
LUBRICANTS'', MA-13.
Refill oil capacity (approximate):
Without oil filter change
TD25 6.5!(5-3/4 Imp qt)
With oil filter change
TD25 7.2!(6-3/8 Imp qt)
CAUTION:
lBe sure to clean and install oil pan drain plug with
washer.
Drain plug:
: 54 - 59 N´m (5.5 - 6.0 kg-m, 40 - 43 ft-lb)
lThe refill capacity changes depending on the oil tem-
perature and drain time; use these valves as a reference
and be certain to check with the dipstick when changing
the oil.
4. Check oil level.
5. Start engine. Check area around drain plug and oil filter for
any sign of oil leakage.
6. Run engine for a few minutes, then turn it off. After several
minutes check oil level.
Changing Engine Oil Filter
1. Remove oil filter with Tool.
WARNING:
Be careful not to burn yourself, as the engine and engine oil
are hot.
DMA002
DMA003-N
.
DMA004
DMA008-A
ENGINE MAINTENANCETD
MA-24

Coolant capacity (With reservoir tank):
TD25 9.5!(8-3/8 Imp qt)
Reservoir tank capacity (for MAX level):
0.6!(1/2 Imp qt)
Pour coolant through coolant filler neck slowly to allow air
in system to escape.
12. Warm up engine to normal operating temperature.
13. Run engine at 2,000 rpm for 10 seconds and return to idle
speed.
lRepeat 2 or 3 times.
Watch coolant temperature gauge so as not to overheat the
engine.
14. Stop engine and cool it down.
lCool down using a fan to reduce the time.
15. Remove the radiator filler cap and check coolant level.
lIf necessary, refill radiator up to filler neck with coolant.
16. Refill reservoir tank to Max line with coolant.
17. Repeat step 12 through step 16 two or more times.
18. Warm up engine, and check for sound of coolant flow while
running engine from idle up to 2,000 rpm with heater tem-
perature control set at several positions between COOL and
HOT.
lSound may be noticeable at heater water cock.
19. If sound is heard, bleed air from cooling system by repeat-
ing steps 12 through 16 until coolant level no longer drops.
lClean excess coolant from engine.
Checking Cooling System
CHECKING HOSES AND CLAMPS
Check hoses and clamps for proper attachment, leaks, cracks,
damage, loose connections, chafing and deterioration.
CHECKING RADIATOR CAP
Apply pressure to radiator cap with cap tester to see if it is sat-
isfactory.
Radiator cap relief pressure:
78-98kPa
(0.78 - 0.98 bar, 0.8 - 1.0 kg/cm
2, 11 - 14 psi)
SMA412B
SLC613
ENGINE MAINTENANCETD
Changing Engine Coolant (Cont'd)
MA-26

Pull the negative-pressure valve to open it. Check that it closes
completely when released.
CHECKING COOLING SYSTEM FOR LEAKS
Apply pressure to the cooling system with cap tester to check for
leakage.
Testing pressure:
157 kPa (1.57 bar, 1.6 kg/cm
2, 23 psi)
CAUTION:
Use of higher pressure than the specified value may cause
damage to radiator.
Checking and Replacing Fuel Filter and
Draining Water
Be careful not to spill fuel in engine compartment. Place a
rag to absorb fuel.
CHECKING FUEL FILTER
Check fuel filter for fuel leakage, damage and other abnormal
signs.
REPLACING FUEL FILTER
1. Disconnect harness connector and drain fuel.
2. Remove 2 bolts fixing fuel filter bracket, and remove the
bracket with fuel filter. Do not remove fuel hose.
3. Install fuel filter upside down using the holes for the bolts to
fix the fuel filter bracket.
4. Remove fuel filter using band-type filter wrench.
Type A
Remove fuel filter and fuel filter sensor.
Type B
Loosen fuel filter within the extent fuel does not spill, return
fuel filter back to the normal position, then remove it.
CAUTION:
Remove fuel filter without spilling fuel. If spilt, wipe off
immediately. Be specially careful not to spill fuel on engine
mount insulator.
SMA871B
SMA990A
DMA011
DMA005
ENGINE MAINTENANCETD
Checking Cooling System (Cont'd)
MA-27

5. Wipe clean fuel filter mounting surface on fuel filter bracket
and smear a little fuel on rubber seal of fuel filter.
6. Screw fuel filter on until a slight resistance is felt, then tighten
an additional more than 2/3 of a turn.
7. Install fuel filter sensor to new fuel filter. (Type A)
8. Bleed air from fuel line.
Refer to Bleeding Fuel System in EC section.
9. Start engine and check for leaks.
DRAINING WATER
1. Drain water as follows.
Type A
Loosen drain cock and drain water.
Loosening drain cock 4 to 5 turns causes water to start
draining. Do not remove drain cock by loosening it exces-
sively.
If water does not drain properly, move the priming pump up and
down.
Type B
Loosen air bleeder screw from the sedimentor cover and then
loosen drain cock and drain water.
Loosening drain cock 4 to 5 turns causes water to start
draining. Do not remove drain cock by loosening it exces-
sively.
2. Bleed air.
Refer to Bleeding Fuel System in EC section.
Checking Fuel Lines
Check fuel lines and tank for proper attachment, leaks, cracks,
damage, loose connections, chafing and deterioration.
CAUTION:
Keep clean parts with compressed air when assembling.
SMA010
SMA825B
SMA281C
SMA803A
ENGINE MAINTENANCETD
Checking and Replacing Fuel Filter and
Draining Water (Cont'd)
MA-28

Cleaning and Replacing Air Cleaner Filter
VISCOUS PAPER TYPE
The viscous paper type air cleaner filter does not require any
cleaning operation between renewal.
Checking Injection Nozzle
WARNING:
When using nozzle tester, be careful not to allow diesel fuel
sprayed from nozzle to come into contact with your hand or
body, and make sure that your eyes are properly protected.
1. Install nozzle to injection nozzle tester and bleed air from
flare nut.
2. Check initial injection pressure by pumping tester handle one
full stroke per second.
Initial injection pressure:
Used nozzle
9,807 - 10,297 kPa
(98.1 - 103.0 bar, 100 - 105 kg/cm
2,
1,422 - 1,493 psi)
New nozzle
10,297 - 11,278 kPa
(103.0 - 112.8 bar, 105 - 115 kg/cm
2,
1,493 - 1,635 psi)
lAlways check initial injection pressure before installing
new nozzle.
DMA006
EF791A
SEF672A
ENGINE MAINTENANCETD
MA-29

3. Check spray pattern by pumping tester handle one full stroke
per second.
a. If main spray angle is within 30 degrees as shown, injec-
tion nozzle is good.
b. It is still normal even if a thin stream of spray deviates
from main spray (pattern B).
4. If initial injection pressure or injection nozzle is not normal,
adjust or clean injection nozzle.
5. Test again. If it is not corrected, replace nozzle.
Refer to EC section for injection pressure adjustment, clean-
ing and replacement.
6. Install all injection nozzles with Tool and securely connect
fuel spill tube and delivery tubes.
7. Bleed air from fuel system and check for fuel leakage with
engine running.
Injection nozzle to cylinder head:
:54-64Nzm (5.5 - 6.5 kg-m, 40 - 47 ft-lb)
Spill tube nut:
:29-39Nzm (3.0 - 4.0 kg-m, 22 - 29 ft-lb)
Injection tube:
:20-25Nzm (2.0 - 2.5 kg-m, 14 - 18 ft-lb)
Checking Idle Speed
Preparation
1. Make sure that injection timing is correct.
2. Make sure that injection nozzles are in good condition.
3. Make sure that the following parts are in good condition.
lAir cleaner clogging
lGlow system
lEngine oil and coolant levels
lValve clearance
lAir intake system (Oil filler cap, oil level gauge, etc.)
4. Set shift lever in ``Neutral'' position. Engage parking brake
and lock both front and rear wheels with wheel chocks.
5. Turn off air conditioner, lights and accessories.
6. Make sure that idle control knob is fully released and idle
adjusting screw contacts accelerator control lever.
SEF079S
ENGINE MAINTENANCETD
Checking Injection Nozzle (Cont'd)
MA-30

lWarm up engine until engine coolant
temperature indicator points to middle
of gauge.
lAttach tachometer's pick-up to No. 1
fuel injection tube.
In order to take accurate reading of
engine rpm, remove clamps that
secure No. 1 fuel injection tube.
Start engine.
Run engine at about 2,000 rpm for about
2 minutes under no-load.b
Run engine for one minute at idle speed.
Check idle speed.
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Idle speed:
TD25 700 50 rpm
OK
cNG
Adjust idle speed by turn-
ing idle speed adjusting
screw.
END
lRev engine two or three times and allow engine to return
to idle speed. If idle speed is not within the specified
range, check acceleration linkage for binding and cor-
rect it if necessary.
AIR CONDITIONER EQUIPPED MODEL
1. Make certain that the clearance between the actuator idle
control lever pin and the injection pump control lever is within
the specified limits.
Clearance:1-2mm(0.04 - 0.08 in)
2. Adjust idle speed to specified rpm without the air conditioner
operating.
3. Then check the idle speed when the air conditioner is oper-
ating and make sure it is correct.
Unit: rpm
Engine TD25
Idle speed
(Air conditioner ``ON'')850 50
If not, adjust it by turning FICD actuator stroke adjusting screw.
SMA021A
SMA406B
SMA792B
DMA010
.
.
.
.
.
ENGINE MAINTENANCETD
Checking Idle Speed (Cont'd)
MA-31